Source: https://patents.google.com/patent/US8349540B2/en
Timestamp: 2020-01-17 20:05:22
Document Index: 528199407

Matched Legal Cases: ['Application No. 2006', 'Application No. 2006', 'art 1', 'art 2', 'art 1', 'art 1', 'art 1', 'art 2', 'art 2', 'art 3', 'art 3', 'Application No. 2006', 'Application No. 2006']

US8349540B2 - Semiconductor device manufacturing method - Google Patents
US8349540B2
US8349540B2 US11/698,062 US69806207A US8349540B2 US 8349540 B2 US8349540 B2 US 8349540B2 US 69806207 A US69806207 A US 69806207A US 8349540 B2 US8349540 B2 US 8349540B2
US11/698,062
US20070178411A1 (en
2006-01-27 Priority to JP2006-19549 priority Critical
2006-01-27 Priority to JP2006019549 priority
2006-01-27 Priority to JP2006-019549 priority
2006-12-28 Priority to JP2006-355162 priority
2006-12-28 Priority to JP2006355162A priority patent/JP5103901B2/en
2007-01-26 Assigned to FUJITSU LIMITED reassignment FUJITSU LIMITED ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: FUTATSUYA, HIROKI, SETTA, YUJI
2007-01-26 Application filed by Fujitsu Semiconductor Ltd filed Critical Fujitsu Semiconductor Ltd
2007-08-02 Publication of US20070178411A1 publication Critical patent/US20070178411A1/en
2013-01-08 Publication of US8349540B2 publication Critical patent/US8349540B2/en
239000004065 semiconductor Substances 0 abstract claims description title 258
238000004519 manufacturing process Methods 0 abstract claims description title 178
239000011295 pitch Substances 0 abstract description 69
238000006011 modification Methods 0 description 173
230000004048 modification Effects 0 description 173
239000010408 films Substances 0 description 132
229920002120 photoresistant polymers Polymers 0 description 89
This application is based upon and claims the benefit of priorities from the prior Japanese Patent Application No. 2006-19549, filed on Jan. 27, 2006, and the prior Japanese Patent Application No. 2006-355162, filed on Dec. 28, 2006, the entire contents of which are incorporated herein by reference.
The present invention relates to a semiconductor device manufacturing method, more specifically, a semiconductor device manufacturing method using oblique incidence illumination.
Semiconductor devices have been continuously required to be micronized, and recently, patterns of a line width shorter than a wavelength of the exposure light source used in the manufacturing process of a semiconductor device are required to be formed.
Accompanying this, recently various illumination techniques for improving the resolution for transferring patterns are proposed. As such illumination technique, oblique incidence illumination (off-axis illumination), for example, is proposed. The oblique incidence illumination is largely divided in modified illumination and annular illumination. As major types of the modified illumination, e.g., two-point illumination (double polar illumination), wherein two apertures are formed in the aperture stop of the illumination system, is known, and four-point illumination (quadrupole illumination), wherein four apertures are formed in the aperture stop of the illumination system, is known. On the other hand, in the annular illumination, an annular aperture is provided in the aperture stop of the illumination system. The size of the aperture of the annular illumination is expressed by the outer sigma (σout) the inner sigma (σin) or others. FIG. 18 is a plan view of the conventional aperture stop of the annular illumination. In FIG. 18, the outer border indicates the border of the effective region of the aperture stop. As illustrated in FIG. 18, a ring-shaped aperture 122 is formed in the annular illumination stop. FIG. 19 is a graph of the relationship between the pitch of patterns and the depth of focus (DOF). In FIG. 19, the pitch of patterns is taken on the horizontal axis, and on the vertical axis, the DOF is taken. In FIG. 19, the DOF is the value with the exposure latitude is 4%.
In FIG. 19, the ● marks indicate the DOF given when the conventional annular illumination stop 116 illustrated in FIG. 18 is used in the illumination system. As indicated by the ● marks in FIG. 19, when the exposure is made with the conventional annular illumination stop, the DOF cannot be always sufficiently large in the range where the pitch of the patterns is about 300 nm or over.
FIG. 20A is a plan view of the layout of the mask pattern for forming holes. In FIG. 20A, on the left side of the drawing, patterns 118 a for forming holes are formed on the reticle with high density. On the other hand, on the right side of the drawing of FIG. 20A, an isolated pattern 118 b for forming a hole is formed on the reticle.
FIG. 20B is a graph of critical dimension-focus (CD-FOCUS) curves (Part 1). In FIG. 20B, the □ marks indicate the CD-FOCUS curve of the case of the left side of the drawing of FIG. 20A, i.e., the patterns 118 a for forming holes are formed relatively densely. In FIG. 20B, the ◯ marks indicate the case of the right side of the drawing of FIG. 20A, i.e., the pattern 118 b for forming a hole is formed isolated. Such CD-FOCUS curves show what influences changes of the DOF give on the resist size. In FIG. 20B, the shift of the focus in exposing the patterns is taken on the horizontal axis. On the vertical axis, the size of the patterns transferred on a resist is taken, and relative pattern sizes to the maximum size of the patterns which is set at 100 are plotted. The inclination of an upward parabola being relatively blunt means that the DOF is relatively wide, and the focus margin is relatively large. On the other hand, the inclination of an upward parabola being relatively acute means that the DOF is relatively narrow, and the focus margin is relatively small. The focus value at the summit of a parabola is called a best focus, and generally the resist size is largest at the best focus. Generally, in comparing the DOF, the focus range where the resist size is 90% or above of the resist size at the best focus is used as the effective DOF.
In FIG. 20B, as indicated by the ◯ marks, when the pattern 118 b for forming a hole is isolated, the focus margin is considerably small.
As a technique of making the focus margin larger, it is proposed to use the exposure technique using together the annular illumination stop and the sub-resolution assist feature (SRAF) technique.
FIG. 21A is a plan view of the mask pattern having assist patterns for increasing the DOF. FIG. 21B a graph of CD-FOCUS curves (Part 2). As illustrated in FIG. 21A, the patterns 121 for increasing the DOF are formed around a pattern for forming a hole.
The □ marks in FIG. 21B are the same as the □ marks in FIG. 20B, i.e., the left side of the drawing of FIG. 20A, i.e., the case that the patterns 118 a for forming holes are formed with relative high density. In FIG. 21B, the ◯ marks are the same as the ◯ marks in FIG. 20B, i.e., the right side of the drawing of FIG. 20A, i.e., the case that the pattern 118 b for forming a hole is formed isolated. In FIG. 21B, the Δ marks indicate the case of FIG. 21A, i.e., the case that the assist patterns 121 are formed around the pattern 118 c for forming a hole.
As seen in FIG. 21B, the assist patterns 121 are suitably provided (see FIG. 21A), whereby the focus margin can be increased in comparison with the case that the pattern for forming a hole is isolated (see FIG. 20A).
In FIG. 19, the ◯ marks indicate the graph of the case that the assist patterns are suitably formed on the reticle over the region where the patterns are dense to the region where the patterns are rare. As indicated by the ◯ marks in FIG. 19, the use of the SRAF technique could somewhat increase the DOF.
Specification of Japanese Patent Application Unexamined Publication No. 2002-122976
Specification of Japanese Patent Application Unexamined Publication No. 2003-234285
However, as indicated by the ◯ marks in FIG. 19, even the combined use of the oblique incidence illumination technique and the SRAF technique cannot always give sufficiently large DOF in the range of, e.g., about 300 nm-600 nm pattern pitch. Then, a technique which can transfer with a high resolution all patterns which are formed on a reticle at various pitches is expected.
An object of the present invention is to provide a semiconductor device manufacturing method which can transfer stably with a high resolution all patterns which are formed on a reticle at various pitches.
According to one aspect of the present invention, there is provided a semiconductor device manufacturing method comprising the step of transferring patterns formed on a reticle to a semiconductor substrate by the exposure using oblique incidence illumination, in the step of making the exposure with oblique incidence illumination, the exposure is made with an aperture stop including a first ring-shaped aperture, and a plurality of second apertures formed around the first ring-shaped aperture.
According to another aspect of the present invention, there is provided a semiconductor device manufacturing method comprising the step of transferring patterns formed on a reticle to a semiconductor substrate by an exposure using oblique incidence illumination, the step of making the exposure with oblique incidence illumination comprising the steps of: making an exposure with a first aperture stop including a first ring-shaped aperture formed in a center part; and making an exposure with a second aperture stop including a plurality of second apertures formed in a peripheral part.
According to further another aspect of the present invention, there is provided a semiconductor device manufacturing method comprising the step of transferring patterns formed on a reticle to a semiconductor substrate by an exposure using oblique incidence illumination, in the step of making the exposure with oblique incidence illumination, the exposure is made with an aperture stop including a first aperture, a second ring-shaped aperture formed around the first aperture, and a third ring-shaped aperture formed around the second aperture.
According to further another aspect of the present invention, there is provided a semiconductor device manufacturing method comprising the step of transferring patterns formed on a reticle to a semiconductor substrate by an exposure using oblique incidence illumination, the step of making the exposure with oblique incidence illumination comprises the steps of: making an exposure with a first aperture stop including a first aperture; making an exposure with a second aperture including a second ring-shaped aperture having an inner diameter which is larger than an outer diameter of the first aperture; and making an exposure with a third aperture stop including a third ring-shaped aperture having an inner diameter which is larger than an outer diameter of the second aperture.
According to the present invention, the exposure is made with an aperture stop having the first ring-shaped aperture which can transfer patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution and the second aperture which can transfer patterns arranged at a relatively small pitch with a relatively high resolution, whereby even when the patterns are arranged at various pitch values, the DOF can be surely sufficient, and the patterns can be stably transferred.
According to the present invention, the first exposure is made with the first aperture stop having the first ring-shaped aperture which can transfer patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution, and the second exposure is made with a second aperture stop having the second aperture which can transfer patterns arranged at a relatively small pitch with a relatively high resolution, whereby even when the patterns are arranged at various pitch values, the DOF can be surely sufficient, and the patterns can be stably transferred.
According to the present invention, patterns are transferred with an aperture stop further having the third ring-shaped aperture formed around the first ring-shaped aperture, whereby even when the patterns for forming holes are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
According to the present invention, patterns are transferred with an aperture stop having the first circular aperture formed in the center, the second ring-shaped aperture formed around the first aperture and the third ring-shaped aperture formed around the second aperture. The first aperture contributes to transferring isolated patterns with a relatively high resolution. The second aperture contributes to transferring patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution. The third aperture contributes to transferring patterns arranged at a relatively small pitch with a relatively high resolution. The third aperture also contributes to transferring patterns arranged in a various direction with a relatively high resolution. Thus, according to the present invention, even when patterns for forming holes are set at various pitch values in various direction, the DOF can be surly sufficient, and the patterns can be stably transferred.
FIG. 1 is a conceptual view of the aligner used in the semiconductor device manufacturing method according to a first embodiment of the present invention.
FIG. 2 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the first embodiment of the present invention.
FIGS. 3A and 3B are conceptual views of the principle of the halftone phase shift mask.
FIG. 4 is a graph (Part 1) of the relationship between the pattern pitch and the DOF.
FIGS. 5A and 5B are plan views of the annular illumination stop and the quadrupole illumination stop.
FIGS. 6A to 6E are sectional views of a semiconductor device in the steps of the semiconductor device manufacturing method according to the first embodiment, which illustrate the method.
FIG. 7 is a plan view of a reticle with assist patterns formed on.
FIG. 8 is a plan view of the aperture stop used in the semiconductor device manufacturing method according to Modification 1 of the first embodiment of the present invention.
FIG. 9 is a plan view of the aperture stop used in the semiconductor device manufacturing method according to Modification 2 of the first embodiment of the present invention.
FIG. 10 is a plan view of the aperture stop used in the semiconductor device manufacturing method according to Modification 3 of the first embodiment of the present invention.
FIG. 11 is a plan view of the aperture stop used in the semiconductor device manufacturing method according to Modification 4 of the first embodiment of the present invention.
FIGS. 12A and 12B are plan views of an aperture stop used in the semiconductor device manufacturing method according to a second embodiment of the present invention.
FIGS. 13A to 13E are sectional view of a semiconductor device in the steps of the semiconductor device manufacturing method according to the second embodiment, which illustrate the method.
FIGS. 14A and 14B are plan views of the aperture stop used in the semiconductor device manufacturing method according to Modification 1 of the second embodiment of the present invention.
FIGS. 15A and 15B are plan views of the aperture stop used in the semiconductor device manufacturing method according to Modification 2 of the second embodiment of the present invention.
FIGS. 16A and 16B are plan views of the aperture stop used in the semiconductor device manufacturing method according to Modification 3 of the second embodiment of the present invention.
FIGS. 17A and 17B are plan views of the aperture stop used in the semiconductor device manufacturing method according to Modification 4 of the second embodiment of the present invention.
FIG. 18 is a plan view of the aperture stop of the conventional annular illumination.
FIG. 19 is a graph of the relationship between the pattern pitch and the DOF.
FIGS. 20A and 20B are a plan view of the layout of the patterns for forming holes.
FIGS. 21A and 21B are a plan view of the layout of the pattern with assist patterns provided for the proximity effect correction.
FIG. 22 is a plan view of the reticle with the patterns arranged in a square lattice.
FIG. 23 is a graph of the relationship between the space size and the DOF given when the patterns arranged in a square lattice are transferred.
FIG. 24 is a plan view of the usual aperture stop.
FIG. 25 is a plan view of the reticle with the patterns arranged in an oblique direction.
FIG. 26 is a graph of the relationship between the space size and the DOF given when the patterns arranged oblique are transferred.
FIG. 27 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to a third embodiment of the present invention.
FIG. 28 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to Modification 1 of the third embodiment of the present invention.
FIG. 29 is a graph (Part 1) of the relationship between the space size and the DOF given when the patterns arranged in a square lattice are transferred.
FIG. 30 is a graph (Part 1) of the relationship between the space size and the DOF given when the patterns arranged oblique are transferred.
FIG. 31 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to Modification 2 of the third embodiment of the present invention.
FIG. 32 is a graph (Part 2) of the relationship between the space size and the DOF given when the patterns arranged in a square lattice are transferred.
FIG. 33 is a graph (Part 2) of the relationship between the space size and the DOF given when the patterns arranged oblique are transferred.
FIG. 34 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to Modification 3 of the third embodiment of the present invention.
FIG. 35 is a graph (Part 3) of the relationship between the space size and the DOF given when the patterns arranged in a square lattice are transferred.
FIG. 36 is a graph (Part 3) of the relationship between the space size and the DOF given when the patterns arranged oblique are transferred.
FIG. 37 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to Modification 4 of the third embodiment of the present invention.
FIG. 38 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to Modification 5 of the third embodiment of the present invention.
FIG. 39 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to Modification 6 of the third embodiment of the present invention.
FIGS. 40A to 40C are plan views of an aperture stop used in the semiconductor device manufacturing method according to a fourth embodiment of the present invention.
FIGS. 41A and 41B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 1 of the fourth embodiment of the present invention.
FIGS. 42A and 42B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 2 of the fourth embodiment of the present invention.
FIGS. 43A and 43B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 3 of the fourth embodiment of the present invention.
FIG. 44 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to a fifth embodiment of the present invention.
FIGS. 45A to 45C are plan views of an aperture stop used in the semiconductor device manufacturing method according to a sixth embodiment of the present invention.
FIGS. 46A and 46B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 1 of the sixth embodiment of the present invention.
FIGS. 47A and 47B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 2 of the sixth embodiment of the present invention.
FIGS. 48A and 48B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 3 of the sixth embodiment of the present invention.
The semiconductor device manufacturing method according to a first embodiment of the present invention will be explained with reference to FIGS. 1 to 5B. FIG. 1 is a conceptual view of the aligner used in the semiconductor device manufacturing method according to the present embodiment. FIG. 2 is a plan view illustrating the aperture stop used in the semiconductor device manufacturing method according to the present embodiment. FIGS. 3A and 3B are conceptual views illustrating the principle of a halftone phase shift mask. FIG. 4 is a graph of the relationship between the pattern pitch and the DOF. FIGS. 5A and 5B are plan views of the annular illumination stop and the quadrupole illumination stop.
First, the aligner used in the exposure step of the present embodiment will be explained with reference to FIG. 1.
As illustrated in FIG. 1, a light source 12 is, e.g., an ArF excimer laser. In FIG. 1, the light source 12 is schematically illustrated.
Below the light source 12, a fly eye 14 for aligning light from the light source 12 in the same direction is provided.
Below the fly eye 14, an aperture stop 16 is provided.
The aperture stop 16 used in the present embodiment is an aperture stop whose aperture is not positioned on the optical axis, i.e., an aperture stop for the oblique incidence illumination. In other words, the aperture stop 16 used in the present embodiment, as illustrated in FIG. 2, includes a first ring-shaped aperture 22 formed at the center, and a plurality of second apertures 24 a 1-24 a 4 formed around the first aperture 22. The outer sigma (σout) of the first aperture 22 and the inner sigma (σin) are set respectively smaller than the outer sigma % out and the inner sigma σin of the aperture 122 of the conventional annular illumination stop. The second aperture 24 a 1-24 a 4 are arranged in square directions of the aperture stop 16 respectively corresponding to the directions from the center of a reticle 18 to the four corners thereof. The second apertures 24 a 1-24 a 4 are arranged with parts thereof being outside an effective region (the outermost border in FIG. 2) of the aperture stop 16. The effective region of the aperture stop is a region which can actually function as the stop. In FIG. 2, the outside of the effective region of the stop is not illustrated, but actually, the outside of an effective region of an aperture stop is generally shaded.
The respective sizes of the aperture stop 16 are as exemplified below. The outer diameter of the effective region of the aperture stop 16 is, e.g., 1.0. The size of the outer sigma (σout) of the first aperture 22 is, e.g., 0.4-0.5. The size of the inner sigma (σin) of the first aperture 22 is, e.g., 0.2-0.3. The distance between the center of the aperture stop 16 and the centers of the second apertures 24 a 1-24 a 4 is, e.g., 0.8-0.9. These sizes are values given by normalizing the outer diameter of the effective region of the aperture stop 16 to be 1.0. The apertures 24 a 1-24 a 4 are formed in the directions as exemplified below with a straight line (hereinafter called a center line) which is parallel with one side of the reticle 18 and passes the center of the aperture stop 16 set as the reference. For example, the angle θ1 formed by the line segment interconnecting the center of the aperture stop 16 and the center of the aperture 24 a 1 and the center line of the aperture stop 16 is set at, e.g., 45 degrees. The angle θ2 formed by the line segment interconnecting the center of the aperture stop 16 and the center of the aperture 24 a 2 and the center line of the aperture stop 16 is set at, e.g., 135 degrees. The angle θ3 formed by the line segment interconnecting the center of the aperture stop 16 and the center of the aperture 24 a 3 and the center line of the aperture stop 16 is set at, e.g., 225 degrees. The angle θ4 formed by the line segment interconnecting the center of the aperture stop 16 and the center of the aperture 24 a and the center line of the aperture stop 16 is set at, e.g., 315 degrees.
The area S1 of the aperture 22 and the total S2 of the areas of the apertures 24 a 1-24 a 4 are substantially equal to each other.
The diameter of the apertures 24 a 1-24 a 4 is set smaller than the outer sigma σout of the aperture 22.
Preferably, the central position Rp of the respective apertures 24 a 1-24 a 4 is set as follows when a wavelength of the light source used in the exposure is λ, and an arrangement pitch is P.
R p=sin−1{λ/[(√2)×P]}
Such aperture stop 16 is used in the present embodiment for the reason which will be detailed later.
Below the aperture stop 16, the reticle (photo mask) 18 having patterns for forming, e.g., holes formed on is provided.
As illustrated in FIGS. 3A and 3B, the reticle 18 is a halftone phase shift mask 18, e.g., having semi-transmissive metal thin film patterns 17 of MoSi or others formed on a quartz dry plate 15.
FIG. 3A is a sectional view of the halftone phase shift mask, and FIG. 3B shows the intensity distribution of the light transmitted by the reticle. In FIG. 3B, the thick line indicates the light intensity distribution given by using the halftone phase shift mask, and the thin line in FIG. 3B indicates the light intensity distribution given by a binary mask.
The halftone phase shift mask 18 is a mask wherein slight light passes through the semi-transmissive metal thin film patterns 17 while the phase of light in the aperture 18 a is reversed with respect to the parts of the metal thin film patterns 17, whereby the light intensity is decreased at the edge part where the respective light is superimposed on each other. As indicated by the thick line in FIG. 3B, at the edge part of the aperture 18 a, slight light transmitted by the semi-transmissive metal thin film patterns 17 and the light which has passed through the aperture 18 a null each other, whereby the light intensity distribution is decreased. Accordingly, the halftone phase shift mask 18 is advantageous in obtaining high resolutions.
The reticle 18 can be a binary mask which is a mask, e.g., having patterns of shade film of chrome or others formed on a quartz dry plate. The reticle 18 can be a Levinson phase shift mask having the effect that when specific light is transmitted by the quart dry plate, the light has the phases of 0 degree and 180 degrees.
Below the reticle 18, a projection lens 19 is disposed.
Below the projection lens 19, a semiconductor substrate (semiconductor wafer) 22 is disposed.
By the exposure by such aligner, the patterns formed on the reticle 18 are transferred on the semiconductor substrate 20.
In the present embodiment, the aperture stop illustrated in FIG. 2 is used for the following reason.
FIG. 4 is a graph of the relationship between the pitch of the patterns and the DOF. In FIG. 4, the pitch of the patterns is taken on the horizontal axis, and the DOF is taken on the vertical axis. The DOF in FIG. 4 is the value with the exposure latitude being 4%.
In FIG. 4, the ● marks indicate the DOF given when the exposure is made with the conventional annular illumination stop 116 illustrated in FIG. 18. As indicated by the ● marks in FIG. 4, by the exposure with the conventional annular illumination stop 116, the DOF cannot be always sufficiently large when the pitch of the patterns is about 300 nm or above.
The ▪ marks in FIG. 4 indicate the DOF given by the exposure with the annular illumination stop 16 e illustrated in FIG. 5A. As seen in the comparison between FIG. 5A and FIG. 18, the inner sigma σin of the ring-shaped aperture 22 in FIG. 5A is set smaller than the inner sigma σin of the ring-shaped aperture 122 in FIG. 18. As seen in the comparison between FIG. 5A and FIG. 18, the outer sigma σout of the ring-shaped aperture 22 in FIG. 5A is set smaller than the outer sigma σout of the ring-shaped aperture 122 in FIG. 18.
As seen in the comparison between the ●-mark plots and the ▪-mark plots, it can be seen that the inner sigma σin and the outer sigma σout of the annular illumination stop are varied, whereby the DOF characteristics for the pattern pitch are conspicuously changed.
As indicated by the ▪ marks in FIG. 4, when the exposure is made with the annular illumination stop 16 e illustrated in FIG. 5A, the DOF is relatively large in the range of the pattern pitch of about 300 nm or over. As indicated by the ▪ marks in FIG. 4, when the exposure is made with the annular illumination stop illustrated in FIG. 5B, the DOF is not always sufficiently large in the range of the pattern pitch of 300 nm or less.
The Δ marks in FIG. 4 indicate the DOF given by the exposure with the quadrupole illumination stop 16 f illustrated in FIG. 5B. As indicated by the Δ marks in FIG. 4, when the exposure is made with the quadrupole illumination stop 16 f illustrated in FIG. 5B, as the pitch of the patterns is increased, the DOF is abruptly decreased. As illustrated by the Δ marks in FIG. 4, the DOF cannot be sufficiently large in the range of the pattern pitch of above about 300 nm.
The inventors of the present application made earnest studies and have obtained the idea that the aperture 22 of the annular illumination stop 16 e illustrated in FIG. 5A and the apertures 24 a 1-24 a 4 of the quadrupole illumination stop 16 f illustrated in FIG. 5B are combined, whereby merits of both can be utilized, and large DOF can be realized at various pitches. That is, the relatively small apertures 24 a 1-24 a 4 arranged in square directions with respect to the center of the aperture stop 16 illustrated in FIG. 5A can contribute to transferring the patterns arranged at a relatively small pitch with a relatively high resolution. On the other hand, the ring-shaped aperture 22 illustrated in FIG. 5B contributes to transferring the patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution.
In FIG. 4, the ◯ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2. As indicated by the ◯ marks in FIG. 4, as the pattern pitch increases, the DOF is decreased to some extent, but the DOF can be sufficiently large even in the range of the pattern pitch of 300 nm or above. Based on this, according to the present embodiment, even with the pattern pitch set at various values, the DOF can be sufficiently large, and the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 6A to 6E. FIGS. 6A to 6E are sectional views of a semiconductor device in the steps of the semiconductor device manufacturing method according to the present embodiment, which illustrate the method.
First, as illustrated in FIG. 6A, a semiconductor substrate 20 is prepared. An inter-layer insulation film 32 is formed on the semiconductor substrate 20. On the inter-layer insulation film 32, a photoresist film 34 is formed. An anti-reflection film is often formed on the upper side or the underside of the photoresist film 34 but is not illustrated in FIGS. 6A to 6E.
Then, the patterns formed on the reticle 18 are transferred onto the photoresist film 34 with the aligner described above with reference to FIGS. 1 and 2 (see FIG. 6B).
Then, as illustrated in FIG. 6C, the photoresist film 34 is developed.
Then, as illustrated in FIG. 6D, the inter-layer insulation film 32 is etched with the photoresist film 34 as the mask. Thus, the patterns of holes, etc. are formed in the inter-layer insulation film 32.
Then, as illustrated in FIG. 6E, the photoresist film 34 is released.
Whether or not assist patterns are provided around the pattern 18 a for forming a hole is not explicitly described here, but as illustrated in FIG. 7, assist patterns 21 may be suitably formed around the pattern 18 a. FIG. 7 is a plan view of a reticle having assist patterns formed on.
As illustrated in FIG. 7, the assist patterns 21 are formed around the pattern 18 a for forming a hole. The assist patterns are provided on the reticle as illustrated in FIG. 7, whereby the required patterns can be stably formed.
Next, the semiconductor manufacturing method according to Modification 1 of the present embodiment will be explained with reference to FIG. 8. FIG. 8 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that second apertures 24 b 1-24 b 4 are arranged all inside the effective region of the aperture stop 16 a.
In the aperture stop 16 illustrated in FIG. 2, the second apertures 24 a 1-24 a 4 are arranged with parts thereof being outside the effective region of the aperture stop 16, but in the present modification, the second apertures 24 b 1-24 b 4 are arranged inside the effective region of the aperture stop 16 a. The effective region of the aperture stop is a region which can actually function as an aperture stop.
The second apertures 24 b 1-24 b 4 may be thus arranged inside the effective region of the aperture stop 16 a.
In the present modification as well as in the semiconductor manufacturing method according to the first embodiment, even with the pattern pitch being set at various values, the DOF can be surely sufficient, and the patterns can be stably transferred.
Whether or not assist patterns are provided around the pattern 18 a for forming a hole is not explicitly described here, but as illustrated in FIG. 7, assist patterns 21 may be suitably formed around the pattern 18 a. The assist patterns are provided on the reticle as illustrated in FIG. 7, whereby the required patterns can be more stably formed.
Then, the semiconductor device manufacturing method according to Modification 2 of the present embodiment will be explained with reference to FIG. 9. FIG. 9 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that third apertures 26 a 1-26 a 4 are further formed around the ring-shaped aperture 22.
As illustrated in FIG. 9, the third apertures 26 a 1-26 a 4 are arranged respectively between the second apertures 24 a 1-24 a 4. The third apertures 26 a 1-26 a 4 are positioned inside the effective regions of the aperture atop 16 b.
In other words, the present modification is characterized in that the relatively small apertures 24 a 1-24 a 4, 26 a 1-26 a 4 are formed octagonally around the ring-shaped aperture 22.
As described above, the exposure can be made by using the aperture atop 16 b having the relatively small apertures 24 a 1-24 a 4, 26 a 1-26 a 4 octagonally formed around the ring-shaped aperture 22.
In the present modification as well as in the semiconductor device manufacturing method according to the first embodiment, even with the pattern pitch being set at various values, the DOF can be surely sufficient, and the patterns can be stably transferred.
Whether or not assist patterns are provided around the pattern 18 a for forming a hole is not explicitly described here, but the assist patterns 21 may be suitably provided around the pattern 18 a as illustrated in FIG. 7. The assist patterns are provided on the reticle as illustrated in FIG. 7, whereby the required patterns can be more stably formed.
Next, the semiconductor device manufacturing method according to a third modification of the present embodiment will be explained with reference to FIG. 10. FIG. 10 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is mainly characterized in that third apertures 28 a 1-28 a 4 are partially positioned inside the ring-shaped aperture 22. The diameter of the third apertures 28 a 1-28 a 4 is set smaller than the diameter of the second apertures 24 a 1-24 a 4.
As described above, the third apertures 28 a 1-28 a 4 may be partially positioned inside the ring-shaped aperture 22.
In the present modification as well in the semiconductor device manufacturing method according to the first embodiment, even with the pattern pitch set at various values, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, Modification 4 of the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIG. 11. FIG. 11 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the diameter of the third apertures 30 a 1-30 a 4 are much smaller than the diameter of the second apertures 24 a 1-24 a 4. The diameter of the third apertures 30 a 1-30 a 4 is, e.g., 0.1-0.2. The size described here is the value given by normalizing the outer diameter of the effective region of the aperture stop 16 to be 1.0.
As described above, the diameter of the third apertures 30 a 1-30 a 4 may be made smaller than the diameter of the second apertures 24 a 1-24 a 4.
In the present modification as well as in the semiconductor device manufacturing method according to the first embodiment, even with the pitch of the patterns set at various values, the DOF can be surely sufficient, and the patterns can be stably transferred.
The semiconductor device manufacturing method according to a second embodiment of the present invention will be explained with reference to FIGS. 12A and 12B. FIGS. 12A and 12B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present embodiment. The same members of the present embodiment as those of the semiconductor device manufacturing method according to the first embodiment illustrated in FIGS. 1 to 11 are represented by the same reference numbers not to repeat or to simplify their explanation.
The semiconductor device manufacturing method according to a second embodiment of the present invention is characterized mainly in that the first exposure is made with the first aperture stop 16 e having a ring-shaped aperture 22 formed in the center, and then the second exposure is made with the second aperture stop 16 f having apertures 24 a 1-24 a 4 formed in square directions with respect to the center of the aperture stop.
FIG. 12A is a plan view of the first aperture stop 16 e having the ring-shaped aperture 22 at the center of the aperture stop. The first aperture stop 16 e used in the present embodiment has a ring-shaped aperture 22 formed in the center. As seen in comparing FIG. 12A with FIG. 18, the inner sigma Gin of the ring-shaped aperture in FIG. 12A is set smaller than the inner sigma σin of the ring-shaped aperture 122 in FIG. 18. As seen in comparing FIG. 12A with FIG. 18, the outer sigma σout of the ring-shaped aperture in FIG. 12A is set smaller than the outer sigma σout of the ring-shaped aperture 122 in FIG. 18.
The respective sizes of the aperture stop 16 e are as exemplified below. The outer diameter of the effective region of the aperture 16 e is, e.g., 1.0. The size of the outer sigma σout of the first aperture 22 is, e.g., 0.4-0.5. The size of the inner sigma σin of the first aperture 22 is, e.g., 0.2-0.3. These sizes are value given by normalizing the outer diameter of the effective region of the aperture stop 16 e to be 1.0.
FIG. 12B is a plan view of the second aperture stop 16 f having the second apertures 24 a 1-24 a 4 in square directions with respect to the center. The positions, shape, etc. of the second apertures 24 a 1-24 a 4 of the second aperture stop 16 f illustrated in FIG. 12B are the same as those of the second apertures 24 a 1-24 a 4 of the aperture stop illustrated in FIG. 2.
In the semiconductor device manufacturing method according to the present embodiment, patterns formed on a reticle 18 are exposed by using the first aperture stop 16 e and is further exposed by using the second aperture stop 16 f. In the present embodiment, the exposure using the first aperture stop 16 e contributes to transferring patterns arranged at a middle pitch to a relatively large pitch with a relatively high resolution. On the other hand, the exposure using the second aperture stop 16 f contributes to transferring patterns arrange at a relatively small pitch with a relatively high resolution. Thus, the present embodiment as well can produce the same advantageous effect as the exposure using the aperture stop 16 used in the first embodiment, and even with patterns set a various values, the DOF can be surely sufficient, and the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 13A to 13E. FIGS. 13A to 13E are the sectional views of a semiconductor device in the steps of the semiconductor device manufacturing method according to the present embodiment, which illustrate the method.
First, as illustrated in FIG. 13A, a semiconductor substrate 20 is prepared. An inter-layer insulation film 32 is formed on the semiconductor substrate 20. A photoresist film 34 is formed on the inter-layer insulation film 32.
Then, the aperture stop 16 e illustrated in FIG. 12A is mounted on the aligner described above with reference to FIG. 1, and patterns formed on a retile 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 16 f illustrated in FIG. 12B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 13B).
Next, as illustrated in FIG. 13C, the photoresist film 34 is developed.
Next, as illustrated in FIG. 13D, the inter-layer insulation film 32 is etched with the photoresist film 34 as the mask. Thus, the patterns of holes, etc., are formed in the inter-layer insulation film 32.
Next, as illustrated in FIG. 13E, the photoresist film 34 is released.
Thus, the semiconductor device of the present embodiment is manufactured.
Whether or not assist patterns are provided around the pattern 18 a for forming a hole is not explicitly described, but as illustrated in FIG. 7, assist patterns 21 may be suitably formed around the pattern 18 a. FIG. 7 is a plan view of the reticle with the assist patterns formed on.
As illustrated in FIG. 7, the assist patterns 21 are formed around the pattern 18 a for forming a hole. The assist patterns are provided on the reticle as illustrated in FIG. 7, whereby the required patterns can be more stably formed.
Then, the semiconductor device manufacturing method according to Modification 1 of the present embodiment will be explained with reference to FIGS. 13A to 14B. FIGS. 14A and 14B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that as illustrated in FIG. 14B, the apertures 24 b 1-24 b 4 of the second aperture atop 16 g for the second exposure are positioned inside the effective region of the aperture stop 16 g.
In the aperture stop 16 f illustrated in FIG. 12B, the second apertures 24 a 1-24 a 4 are partially positioned outside the effective region of the aperture stop 16 f, but in the present modification, as illustrated in FIG. 14B, the second apertures 24 b 1-24 b 4 are arranged inside the effective region of the aperture stop 16 g. The effective region of the aperture stop is a region which can actually function as the stop.
The second apertures 24 b 1-24 b 4 may be thus positioned inside the effective region of the aperture stop 16 g.
Then, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 13A to 13E. FIGS. 13A to 13E are sectional views of the semiconductor device in the steps of the semiconductor device manufacturing method according to the present embodiment, which illustrate the method.
The aperture stop 16 e illustrated in FIG. 14A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 16 g illustrated in FIG. 14B is mounted on the aligner described above with reference to FIG. 1, and patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 13B). An anti-reflection film is often formed on the upper side or the underside of the photoresist film 34 but is omitted in FIGS. 13A to 13E.
Next, as illustrated in FIG. 13D, the inter-layer insulation film 32 is etched with the photoresist film 34 as the mask. Thus, the patterns of holes, etc. are formed in the inter-layer insulation film 32.
Then, as illustrated in FIG. 13E, the photoresist film 34 is released.
Whether or not assist patterns are provided around the pattern 18 a for forming hole is not explicitly explained here, but as illustrated in FIG. 7, the assist patterns 21 may be suitably formed around the pattern 18 a. The assist patterns are provided on the reticle as illustrated in FIG. 7, whereby the required patterns can be stably formed.
Then, the semiconductor device manufacturing method according to Modification 2 of the present embodiment will be explained with reference to FIGS. 13A to 13E, 15A and 15B. FIGS. 15A and 15B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that as illustrated in FIG. 15B, the second aperture stop 16 h for the second exposure further has the third apertures 26 a 1-26 a 4 respectively between the second apertures 24 a 1-24 a 4.
As illustrated in FIG. 15B, the third apertures 26 a 1-26 a 4 are positioned respectively between the second apertures 24 a 1-24 a 4. The third apertures 26 a 1-26 a 4 are positioned inside the effective region of the aperture stop 16 h.
In other words, in the present modification, the relatively small apertures 24 a 1-24 a 4, 26 a 1-26 a 4 are formed octagonally around the ring-shaped aperture 22.
As described above, the exposure may be made by using the aperture stop 16 h having the relatively small apertures 24 a 1-24 a 4, 26 a 1-26 a 4 thus formed octagonally around the ring-shaped aperture 22.
The aperture stop 16 e illustrated in FIG. 15A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20. An anti-reflection film is often formed on the upper side or the underside of the photoresist film 34 but is omitted in FIGS. 13A to 13E.
Then, the aperture stop 16 h illustrated in FIG. 15B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 13B).
Then, as illustrated in FIG. 13C, the photoresist film 34 is developed.
Thus, the semiconductor device of the present modification is manufactured.
In the present modification as well as in the semiconductor device manufacturing method according to the first embodiment, even with the pattern pitch set at various values, the DOF can be surely sufficient, and the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to Modification 3 of the present embodiment will be explained with reference to FIGS. 13A to 13E, 16A and 16B. FIGS. 16A and 16B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 i used in the second exposure has third apertures 28 a 1-28 a 4 relatively inner formed.
When the aperture stops 16 e used in the first exposure and the second aperture stops 16 i used in the second exposure are superimposed on each other, the third apertures 28 a 1-28 a 4 are partially positioned in the aperture 22.
The third apertures 28 a 1-28 a 4 of the aperture stop 16 i for the second exposure may be positioned relatively nearer the center of the aperture stop 16 i.
Then, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 13A to 13E. FIGS. 13A to 13E are sectional views of the semiconductor device in the steps of the semiconductor device manufacturing method according to the present modification, which illustrate the method.
The aperture stop 16 e illustrated in FIG. 16A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 16 i illustrated in FIG. 16B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 13B).
Then, as illustrated in FIG. 13D, the inter-layer insulation film 32 is etched with the photoresist film 34 as the mask. Thus, the patterns of holes, etc. are formed in the inter-layer insulation film 32.
Then, the semiconductor device manufacturing method according to Modification 4 of the present embodiment will be explained with reference to FIGS. 13A to 13E, 17A and 17B. FIGS. 17A and 17B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 j for the second exposure has third apertures 30 a 1-30 a 4 formed in a smaller diameter than the second apertures 24 a 1-24 a 4.
The diameter of the third apertures 30 a 1-30 a 4 may be thus smaller than the diameter of the second apertures 24 a 1-24 a 4.
Then, the semiconductor device manufacturing method according to the present modification will be explained with reference to FIGS. 13A to 13E. FIGS. 13A to 13E are sectional views of the semiconductor device in the steps of the semiconductor device manufacturing method according to the present modification, which illustrate the method.
The aperture stop 16 e illustrated in FIG. 17A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 16 j illustrated in FIG. 17B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 13B).
Next, as illustrated in FIG. 13D, the inter-layer insulation film 32 is etched with the photoresist film 34 as the mask. Thus, the patterns, as of holes, etc., are formed in the photoresist film 32.
Then, as illustrated in FIG. 13E, the photoresist film 32 is released.
In the present modification as well as the semiconductor device manufacturing method according to the second embodiment, even with the pattern pitch set at various pitches, the DOF can be surely sufficient, and the patterns can be stably transferred.
According to the semiconductor device manufacturing method according to the first and the second embodiments, even with the pattern pitch set at various values, the DOF can be surely sufficient, and patterns can be stably transferred.
FIG. 22 is a plan view of a reticle having patterns arranged in a square lattice. In FIG. 22, d1 represents a pitch between patterns 18 a neighboring each other, i.e., a space size.
FIG. 23 is a graph of the relationship between the space size d1 of patterns arranged in a square lattice to be transferred, and the DOF. In FIG. 23, the space size d1 is taken on the horizontal axis, and on the vertical axis, the normalized DOF is taken. The DOF in FIG. 23 is the values given with the exposure latitude being set at 4%. In FIG. 23, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 23, the ◯ marks indicate the DOF given by the exposure with the usual aperture stop 124 illustrated in FIG. 24. FIG. 24 is a plan view of the usual aperture stop. As illustrated in FIG. 24, a relatively large circular aperture 126 is formed in the aperture stop 124. In FIG. 23, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 of the first embodiment.
As seen in comparing the ●-marked plots, the ◯-marked plots and the □-marked plots with one another, when the exposure is made with the aperture stop 16 illustrated in FIG. 2, even with the space size d1 set at various values, the DOF can be surely sufficient.
However, the inventors of the present application made earnest studies and have found that when the exposure is made with the aperture stop 16 illustrated in FIG. 2, with the patterns 18 a arranged oblique to the sides of the reticle 18, the DOF cannot be often surely sufficient.
FIG. 25 is a plan view of the reticle having the patterns arranged oblique. In FIG. 25, the patterns are arranged at 45 degrees to the sides of the reticle 18. In FIG. 25, d2 is a pitch 18 a of the patterns neighboring each other, i.e., the space size.
FIG. 26 is a graph of the relationship between the space size d2 and the DOF in transferring the patterns arrange oblique. In FIG. 26, the space size d2 is taken on the horizontal axis, and on the vertical axis, the normalized DOF is taken. In FIG. 26, the DOF is the value given with the exposure latitude being 4%. In FIG. 26, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 26, the ◯ marks indicate the DOF given by the exposure suing the usual aperture stop 124 illustrated in FIG. 24. In FIG. 26, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 of the first embodiment.
As see in comparing the ●-marked plots, the ◯-marked plots and the □-marked plots with one another, when the patterns arranged oblique are transferred by using the aperture stop 16 illustrated in FIG. 2, the DOF cannot be always surely sufficient.
In transferring the patterns arrange oblique by using the aperture stop 16 illustrated in FIG. 2, the DOF cannot be sufficient, because the second apertures 24 b 1-24 b 4 arranged respectively at 45 degrees, 135 degrees, 225 degrees and 315 degrees to the center of the aperture stop 16 will be advantageous to transfer the patterns arranged in a square lattice but will be disadvantageous to transfer the patterns arranged oblique. The second apertures 24 b 1-24 b 4 which are temporarily arranged at 0 degree, 90 degrees, 180 degrees and 270 degrees to the center of the aperture stop 16 are advantageous to transfer the patterns arranged oblique but disadvantageous to transfer the patterns arranged in a square lattice.
The inventors of the present application made earnest studies and have obtained the idea that, as illustrated in FIG. 27, the third ring-shaped aperture 36 is further formed outside the first ring-shaped aperture 22. The third ring-shaped aperture 36 formed outside the first ring-shaped aperture 22 is not oriented in a specific direction, as are the second apertures 24 b 1-24 b 4 and can contribute to transferring the patterns arranged in various direction with a relatively high resolution. Thus, the patterns are transferred with the aperture stop 16 k having the third ring-shaped aperture 36 further formed around the first ring-shaped aperture 22, whereby, even with the patterns 18 a for forming holes arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
The semiconductor device manufacturing method according to the third embodiment of the present invention will be explained with reference to FIGS. 6A to 6E and 27. FIG. 27 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present embodiment. The same members of the present embodiment as those of the semiconductor device manufacturing method according to the first embodiment or the second embodiment illustrated in FIGS. 1 to 17B are represented by the same reference numbers not to repeat or to simplify their explanation.
As illustrated in FIG. 27, the aperture stop 16 k used in the present embodiment has the first ring-shaped aperture 22 formed at the center, the third ring-shaped aperture 36 formed around the first aperture 22, and a plurality of the second apertures 24 b 1-24 b 4 formed around the third aperture 36.
The inner sigma σin(2) of the third aperture 36 is set larger than the outer sigma σout(1) of the first aperture 22. In other words, the inner diameter of the third aperture 36 is set larger than the outer diameter of the first aperture 22.
The second apertures 24 b 1-24 b 4 are arranged inside the effective region of the aperture stop 16 k.
The respective sizes of the aperture stop 16 k are exemplified below. These sizes are normalized values with the outer diameter of the effective region of the aperture stop 16 k being 1.0.
The size of the outer sigma σout(1) of the first aperture 22 is, e.g., 0.4-0.5. The size of the inner sigma σin(1) of the first aperture 22 is, e.g., 0.2-0.3.
The size of the outer sigma σout(2) of the third aperture 36 is, e.g., 0.55-0.70. The inner sigma σin(2) of the third aperture 36 is, e.g., 0.75-0.90.
The distance between the center of the aperture 16 k and the centers of the second apertures 24 b 1-24 b 4 is, e.g., 0.8-0.9. The second apertures 24 b 1-24 b 4 are partially positioned in the third ring-shaped aperture 36. The apertures 24 b 1-24 b 4 are formed in, e.g., the following directions with respect to the straight line (center line) which is a straight line parallel with one of the sides of the reticle 18 and passes the center of the aperture stop 16 k. For example, the angle formed by the line segment interconnecting the center of the aperture 16 k and the center of the aperture 24 b 1, and the center line of the aperture stop 16 k is set at, e.g., 45 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 k and the center of the aperture 24 b 2, and the center line of the aperture stop 16 k is set at, e.g., 135 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 k and the center of the aperture 24 b 3, and the center line of the aperture stop 16 k is set at, e.g., 225 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 k and the center of the aperture 24 b 4, and the center line of the aperture stop 16 k is set at, e.g., 315 degrees.
Thus, the aperture stop 16 k of the present embodiment is constituted.
Next, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 6A to 6E.
First, as illustrated in FIGS. 6A to 6E, a semiconductor substrate 20 with an inter-layer insulation film 32, a photoresist film 34, etc. formed on is prepared.
Next, the aperture stop 16 k illustrated in FIG. 27 is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
Next, as illustrated in FIG. 6C, the photoresist film 34 is developed.
Then, as illustrated in FIG. 6D, with the photoresist film 34 as the mask, the inter-layer insulation film 32 is etched. Thus, the patterns of holes, etc. are formed in the inter-layer insulation film 32.
In FIG. 26, the ▪ marks indicate the DOF given by transferring the obliquely arranged patterns (see FIG. 25) with the aperture stop 16 k of the present embodiment illustrated in FIG. 27. As seen in comparing the □-marked plots with the ▪-marked plots in FIG. 26, the use of the aperture stop 16 k of the present embodiment can make the DOF sufficient even with the patterns 18 a for forming the holes arranged oblique.
In FIG. 23, the ▪ marks indicate the DOF given by transferring the pattern arranged in a square lattice (see FIG. 22) by using the aperture 16 k of the present embodiment illustrated in FIG. 27. As seen in FIG. 23, the use of the aperture stop 16 k of the present embodiment can make the DOF sufficient even when the pattern 18 a for forming holes are arranged in a square lattice.
Based on the above, the use of the aperture stop 16 k of the present embodiment can make the DOF sufficient even when the pattern 18 a for forming holes are arranged in various directions.
As described above, according to the present embodiment, the aperture stop 16 k having the third ring-shaped aperture 36 further formed around the first ring-shaped aperture 22 is used to transfer the patterns, whereby even with the patterns 18 a for forming holes arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to Modification 1 of the present embodiment will be explained with reference to FIGS. 28 to 30. FIG. 28 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification. FIG. 29 is a graph of the relationship between the space size and the DOF given when the patterns arranged in a square lattice are transferred. FIG. 30 is a graph of the relationship between the space size and the DOF given when the patterns arranged oblique are transferred.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the patterns are transferred by using the aperture stop 161 illustrated in FIG. 28. That is, the semiconductor device manufacturing method according to the present modification is characterized mainly in that the outer sigma σout(2) of the third ring-shaped aperture 36 a and the size of the inner sigma σin(2) are smaller than those of the aperture stop 16 k illustrated in FIG. 27, and the second apertures 24 b 1-24 b 4 are not positioned in the third ring-shaped aperture 36 a.
The respective sizes of the aperture stop 161 are as exemplified below. These sizes are values given by normalizing the outer diameter of the effective region of the aperture stop 161 to be 1.0.
The size of the outer sigma σout(1) of the first aperture 22 is, e.g., 0.4-0.5. The inner sigma σin(1) of the first aperture 22 is, e.g., 0.2-0.3.
The outer sigma σout(2) of the third aperture 36 a is, e.g., 0.55-0.7. The size of the inner sigma σin(2) of the third aperture 36 a is, e.g., 0.75-0.90.
The distance between the center of the aperture stop 161 and the centers of the second apertures 24 b 1-24 b 4 are, e.g., 0.8-0.9. The second apertures 24 b 1-24 b 4 are not positioned inside the third aperture 36 a but are positioned outside the third ring-shaped aperture 36 a. That is, the second apertures 24 b 1-24 b 4 and the third ring-shaped aperture 36 a are not superimposed on each other.
Thus, the aperture stop 161 of the present modification is constituted.
FIG. 29 is a graph of the relationship between the space size d1 and the DOF given when the patterns arranged in a square lattice are transferred. In FIG. 29, the space size is taken on the horizontal axis, and the normalized DOF is taken on the vertical axis. In FIG. 29, the DOF is values given when the exposure latitude is 4%. In FIG. 29, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 29, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 according to the first embodiment. In FIG. 29, the ▪ marks indicate the DOF given by the exposure with the aperture stop 16 k illustrated in FIG. 27, i.e., the aperture stop 16 k of the third embodiment. In FIG. 29, the ◯ marks indicate the DOF given by the exposure with the aperture stop 161 illustrated in FIG. 28, i.e., the aperture stop 161 according to the present modification.
As seen in FIG. 29, the use of the aperture stop 161 according to the present modification as well can make the DOF sufficient.
FIG. 30 is a graph of the relationship between the space size d2 and the DOF given when the patterns arrange oblique are transferred. In FIG. 30, the space size d2 is taken on the horizontal axis, and on the vertical axis, the DOF is taken. In FIG. 30, the DOF is values given when the exposure latitude is 4%. In FIG. 30, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 30, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 according to the first embodiment. In FIG. 30, the ▪ marks indicate the DOF given by the exposure with the aperture stop 16 k illustrated in FIG. 27, i.e., the aperture stop 16 k according to the third embodiment. In FIG. 30, the ◯ marks indicate the DOF given by the exposure with the aperture stop 161 illustrated in FIG. 28, i.e., the aperture stop 161 according to the present modification.
As seen in FIG. 30, the aperture stop 161 according to the present modification as well can make the DOF sufficient.
As described above, in the present modification as well the semiconductor device manufacturing method according to the third embodiment, even when the patterns 18 a for forming holes are arranged in various directions, the DOF can be made sufficient, and the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to Modification 2 of the present embodiment will be explained with reference to FIGS. 31 to 33. FIG. 31 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification. FIG. 32 is a graph of the relationship between the space size and the DOF given when the patterns arranged in a square lattice are transferred. FIG. 33 is a graph of the relationship between the space size and the DOF given when patterns arranged oblique are transferred.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the patterns are transferred with the aperture stop 16 m illustrated in FIG. 31. That is, the semiconductor device manufacturing method is characterized mainly in that the outer sigma σout(2) of the third ring-shaped aperture 36 b and the inner sigma σin(2) of the third ring-shaped aperture 36 b are set smaller than those of the aperture stop 16 k illustrated in FIG. 27, and the aperture stop 16 m having the second apertures 24 c 1-24 c 4 positioned inside the third aperture 36 b is used to transfer the patterns.
The respective sizes of the aperture stop 16 m are as exemplified below. These sizes are value given normalizing the outer diameter of the effective region of the aperture stop 16 m to be 1.0.
The size of the outer sigma σout(1) of the first aperture 22 is, e.g., 0.4-0.5. The size of the inner σin(1) of the first aperture 22 is, e.g., 0.2-0.3.
The size of the outer sigma σout(2) of the third aperture 36 b is, e.g., 0.85-0.95. The size of the inner σin(2) of the third aperture 36 b is, e.g., 0.75-0.85.
The distance between the center of the aperture stop 16 m and the centers of the second apertures 24 c 1-24 c 4 is, e.g., 0.55-0.70. The second apertures 24 c 1-24 c 4 are positioned outside the first ring-shaped aperture 22 and inside the third ring-shaped aperture 36 b.
Thus, the aperture 16 m of the present modification is constituted.
FIG. 32 is a graph of the relationship between the space size d1 for transferring the patterns arranged in a square lattice and the DOF. In FIG. 32, the space size d1 is taken on the horizontal axis, and on the vertical axis, the DOF is taken. In FIG. 32, the DOF is values given when the exposure latitude is 4%. In FIG. 32, the ● marks indicate the DOF given when the exposure is made with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 32, the □ marks indicate the DOF given when the exposure is made with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 according to the first embodiment. In FIG. 32, the ▪ marks indicate the DOF given when the exposure is made with the aperture stop 16 k illustrated in FIG. 27, i.e., the aperture stop 16 k according to the third embodiment. In FIG. 32, the ◯ marks indicate the DOF given when the exposure is made with the aperture stop 16 m illustrated in FIG. 31, i.e., the aperture stop 16 m according to the present modification.
As seen in FIG. 32, even with the aperture stop 16 m of the present modification, the DOF can be made sufficient.
FIG. 33 is a graph of the relationship between the space size d2 for transferring the patterns arranged oblique and the DOF. In FIG. 33, the space size d2 is taken on the horizontal axis, and on the vertical axis, the normalized DOF is taken. In FIG. 33, the DOF is values given when the exposure latitude is 4%. In FIG. 33, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 33, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 according to the first embodiment. In FIG. 33, the ▪ marks indicate the DOF given by the exposure with the aperture stop 16 k illustrated in FIG. 27, i.e., the aperture stop 16 k according to the third embodiment. In FIG. 33, the ◯ marks indicate the DOF given by the exposure with the aperture stop 16 m illustrated in FIG. 31, i.e., the aperture stop 16 m according to the present modification As seen in FIG. 33, when the space size d2 is relatively small, the present modification can make the DOF larger than the DOF given with the aperture stop 16 illustrated in FIG. 2.
As described above, the present modification as well can surely make the DOF sufficient, and the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to Modification 3 of the present embodiment will be explained with reference to FIGS. 34 to 36. FIG. 34 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification. FIG. 35 is a graph of the relationship between the space size for transferring the patterns arranged in a square lattice and the DOF. FIG. 36 is a graph of the relationship between the space size for transferring the patterns arranged oblique and the DOF.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 n illustrated in FIG. 34 is used to transfer the patterns. That is, the semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 n having the size of the outer sigma σout(2) and the size of the inner sigma σin(2) of the third ring-shaped aperture 36 c set larger than those of the aperture stop 16 k illustrated in FIG. 27 and having the second apertures 24 c 1-24 c 4 partially positioned in the third ring-shaped aperture 36 b is used to transfer the patterns.
The respective sizes of the aperture stop 16 n are as exemplified below. These sizes are values normalized with the outer diameter of the effective region of the aperture stop 16 n being 1.0.
The size of the outer sigma σout(1) of the first aperture 22 is, e.g., 0.4-0.5. The size of the inner sigma σin(1) of the first aperture-22 is, e.g., 0.2-0.3.
The size of the outer sigma σout(2) of the third aperture 36 c is, e.g., 0.8-0.9. The size of the inner sigma σin(2) of the third aperture 36 c is, e.g., 0.7-0.8.
The distance between the center of the aperture stop 16 n and the centers of the second apertures 24 b 1-24 b 4 is, e.g., 0.8-0.9. The second apertures 24 b 1-24 b 4 are partially positioned in the third ring-shaped aperture 36 c. That is, the second apertures 24 b 1-24 b 4 partially overlap the third ring-shaped aperture 36 c.
Thus, the aperture stop 16 n of the present modification is constituted.
FIG. 35 is a graph of the relationship between the space size d1 for transferring the patterns arranged in a square lattice and the DOF. In FIG. 35, the space size d1 is taken on the horizontal axis, and on the vertical axis, the normalized DOF is taken. In FIG. 35, the DOF is values given when the exposure latitude is 4%. In FIG. 35, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 35, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the exposure with the aperture stop 16 according to the first embodiment. In FIG. 35, the ▪ marks indicate the DOF given by the exposure with the aperture stop 16 k illustrated in FIG. 27, i.e., the exposure with the aperture stop 16 k according to the third embodiment. In FIG. 35, the ◯ marks indicate the DOF given by the exposure with the aperture stop 16 n illustrated in FIG. 34, i.e., the exposure with the aperture stop 16 n according to the present modification.
As seen in FIG. 35, even with the aperture stop 16 n according to the present modification, the DOF can be surely sufficient.
FIG. 36 is a graph of the relationship between the space size d2 for transferring the patterns arrange oblique and the DOF. In FIG. 36, the space size d2 is taken on the horizontal axis, and on the vertical axis, the normalized DOF is taken. In FIG. 36, the DOF is values given when the exposure latitude is 4%. In FIG. 36, the ● marks indicate the DOF given by the exposure with the conventional annular illumination stop 116 illustrated in FIG. 18. In FIG. 36, the □ marks indicate the DOF given by the exposure with the aperture stop 16 illustrated in FIG. 2, i.e., the aperture stop 16 according to the first embodiment. In FIG. 36, the ▪ marks indicate the DOF given by the exposure with the aperture stop 16 k illustrated in FIG. 27, i.e., the exposure with the aperture stop 16 k according to the third embodiment. In FIG. 36, the ◯ marks indicate the DOF given by the exposure with the aperture stop 16 n illustrated in FIG. 34, i.e., the exposure with the aperture stop 16 n according to the present modification.
As seen in FIG. 36, when the space size d2 is relatively small, the present modification can make the DOF larger than the DOF given by the aperture stop 16 illustrated in FIG. 2.
As described above, the present modification as well can make the DOF surely sufficiently large and can stably transfer the patterns.
Then, the semiconductor device manufacturing method according to Modification 4 of the present embodiment will be explained. FIG. 37 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the patterns are transferred by using an aperture stop 16 o illustrated in FIG. 37. That is, the semiconductor device manufacturing method according to the present modification is characterized mainly in that the patterns are transferred by using the aperture 16 o having the second apertures 24 a 1-24 a 6 hexagonally arranged.
As illustrated in FIG. 37, the second apertures 24 a 1-24 a 6 are hexagonally formed.
The apertures 24 b 1-24 b 6 are formed in the direction as exemplified below with the straight line (center line) parallel with one of the sides of the reticle 18 and passing the center of the aperture stop 16 o set as the reference. For example, the angle formed by the line segment interconnecting the center of the aperture stop 16 o and the center of the aperture 24 b 1, and the center line of the aperture stop 16 o is set at, e.g., 30 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 o and the center of the aperture 24 b 2, and the center line of the aperture stop 16 o is set at, e.g., 90 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 o and the center of the aperture 24 b 3, and the center line of the aperture stop 16 o is set at, e.g., 150 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 o and the center of the aperture 24 b 4, and the center line of the aperture stop 16 o is set at, e.g., 210 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 o and the center of the aperture 24 b 5, and the center line of the aperture stop 16 o is set at, e.g., 270 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 o and the center of the aperture 24 b 6, and the center line of the aperture stop 16 o is set at, e.g., 330 degrees.
The second apertures 24 b 1-24 b 6 are partially positioned in the third ring-shaped aperture 36. That is, the second apertures 24 b 1-24 b 6 partially overlap the third ring-shaped aperture 36.
In the present modification as well in the semiconductor device manufacturing method according to the third embodiment, even when the patterns 18 a for forming holes are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
The semiconductor device manufacturing method according to Modification 5 of the present embodiment will be explained with reference to FIG. 38. FIG. 38 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that an aperture stop 16 p illustrated in FIG. 38 is used to transfer the patterns. That is, the semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 p having the second apertures 24 a 1-24 a 8 octagonally formed is used to transfer the patterns.
As illustrated in FIG. 38, the second apertures 24 a 1-24 a 8 are octagonally formed.
The apertures 24 b 1-24 b 8 are formed in the direction as exemplified below with the straight line (center line) parallel with one of the sides of the reticle 18 and passing the center of the aperture stop 16 p set as the reference. For example, the angle formed by the line segment interconnecting the center of the aperture stop 16 p and the center of the aperture 24 b 1, and the center line of the aperture stop 16 p is set at, e.g., 0 degree. The angle formed by the line segment interconnecting the center of the aperture stop 16 p and the center of the aperture 24 b 2, and the center line of the aperture stop 16 p is set at, e.g., 45 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 p and the center of the aperture 24 b 3, and the center line of the aperture stop 16 p is set at, e.g., 90 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 p and the center of the aperture 24 b 4, and the center line of the aperture stop 16 p is set at, e.g., 135 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 p and the center of the aperture 24 b 5, and the center line of the aperture stop 16 p is set at, e.g., 180 degrees. The angle formed by the line segment interconnecting the center of the aperture stop 16 p and the center of the aperture 24 b 6, and the center line of the aperture stop 16 p is set at, e.g., 225 degrees. The angle formed by the line segment interconnecting the center of the aperture 16 p and the center of the aperture 24 b 7, and the center line of the aperture stop 16 p is set at, e.g., 270 degrees. The angle formed by the line segment interconnecting the center of the aperture 16 p and the center of the aperture 24 b 8, and the center line of the apertures stop 16 p is set at, e.g., 315 degrees.
The second apertures 24 b 1-24 b 8 are partially positioned in the third ring-shaped aperture 36. That is, the second apertures 24 b 1-24 b 8 partially overlap the third ring-shaped aperture 36.
In the present modification as well the semiconductor device manufacturing method according to the third embodiment, even when the patterns 18 a for forming holes are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, the semiconductor device manufacturing method according to Modification 6 of the present embodiment will be explained with reference to FIG. 39. FIG. 39 is a plan view of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 q illustrated in FIG. 39 is sued to transfer the patterns. That is, the semiconductor device manufacturing method according to the present modification is characterized mainly in that the aperture stop 16 q having the fourth aperture 38 further formed in the center is used to transfer the patterns.
As illustrated in FIG. 39, the aperture 38 having a smaller diameter than the inner sigma σin(1) of the first ring-shaped aperture 22 is formed in the center of the aperture stop 16 q, i.e., inside the first ring-shaped aperture 22 a. The aperture 38 contributes to transferring patterns isolated the other patterns, i.e., isolated patterns with a relatively high resolution.
The respective sizes of the aperture stop 16 q are as exemplified below. These sizes are normalized with the outer diameter of the effective region of the apertures stop 16 q set at 1.0.
The size of the outer sigma σout(1) of the first aperture 22 a is, e.g., 0.4-0.5. The size of the inner sigma σin(1) of the first aperture 22 a is, e.g., 0.2-0.3.
The size of the outer sigma σout(2) of the third aperture 36 d is, e.g., 0.8-0.9. The size of the inner sigma σin(2) of the third aperture 36 d is, e.g., 0.7-0.8.
The distance between the center of the aperture stop 16 q and the centers of the second apertures 24 b 1-24 b 4 is, e.g., 0.8-0.9. The second apertures 24 b 1-24 b 4 are partially positioned in the third ring-shaped aperture 36 d. That is, the second apertures 24 b 1-24 b 4 partially overlap the third ring-shaped aperture 36 d.
The diameter of the fourth aperture 38 is, e.g., 0.1-0.25.
Thus, the aperture stop 16 q of the present modification is thus formed.
In the present modification, because of the aperture 38 formed in the center of the aperture stop 16 q, even when patterns are present, isolated on the reticle, patterns can be transferred with a high resolution.
The semiconductor device manufacturing method according to a fourth embodiment of the present invention will be explained with reference to FIGS. 6A to 6E and 40A to 40C. FIG. 40 is plans view of an aperture stop used in the semiconductor device manufacturing method according to the present embodiment. The same members of the present embodiment as those of the semiconductor device manufacturing method according to the first to the third embodiments illustrated in FIGS. 1 to 39 are represented by the same reference numbers not to repeat or to simplify their explanation.
The semiconductor device manufacturing method according to the present embodiment is characterized mainly in that the first exposure is made with the first aperture stop 16 r having the first ring-shaped aperture 22 formed in, then the second exposure is made with the second aperture stop 16 s having apertures 24 b 1-24 b 4 formed in, and then the third exposure is made with the third aperture stop 16 t having the third ring-shaped aperture stop 36 formed in.
FIG. 40A is a plan view of the first aperture stop 16 r having the first ring-shaped aperture 22 formed in at the center. The first aperture stop 16 r used in the present embodiment has the first ring-shaped aperture 22 formed in the center. The position, shape, etc. of the first aperture 22 of the first aperture stop 16 r illustrated in FIG. 40A are the same as the position, shape, etc. of the first aperture 22 of the aperture stop 16 k illustrated in FIG. 27.
FIG. 40B is a plan view of the second aperture stop 16 s having the second apertures 24 b 1-24 b 4 in square directions around the center. The positions, shape, etc. of the second aperture stop 16 s illustrated in FIG. 40B are the same as the position, shape, etc. of the second apertures 24 b 1-24 b 4 of the aperture stop 16 k illustrated in FIG. 27.
FIG. 40C is a plan view of the third aperture stop 16 t having the third ring-shaped aperture 36 formed in. The position and shape of the third aperture 36 of the third aperture stop 16 t illustrated in FIG. 40C are the same as the position and shape of the aperture stop 16 k illustrated in FIG. 27.
Next, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 6A to 6E and 40A to 40C.
First, as illustrated in FIG. 6A, a semiconductor substrate 20 having an inter-layer insulation film 32, a photoresist film 34, etc. formed on is prepared.
Then, the aperture stop 16 r illustrated in FIG. 40A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Next, the aperture stop 16 s illustrated in FIG. 40B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Next, the aperture stop 16 t illustrated in FIG. 40C is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
Thus, the semiconductor device of the present embodiment is fabricated.
In the semiconductor device manufacturing method according to the present embodiment, the patterns formed on the reticle 18 are exposed with the first aperture stop 16 r, then exposed with the second aperture stop 16 s and exposed with the third aperture stop 16 t. The exposure with the first aperture stop 16 r contributes to transferring patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution. The exposure with the second aperture stop 16 s contributes to transferring patterns arranged at a relatively small pitch with a relatively high resolution. The exposure with the third aperture stop 16 t contributes to transferring patterns arranged in various directions with a relatively high resolution. Accordingly, the present embodiment as well produces the same advantageous effect as the aperture stop 16 k according to the third embodiment, and even when the patterns 18 a for forming holes are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, the semiconductor device manufacturing method according to Modification 1 of the present embodiment will be explained with reference to FIGS. 6A to 6E, 41A and 41B. FIGS. 41A and 41B are plan views of an aperture stop used in the semiconductor device manufacturing method according to Modification 1 of the present embodiment.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the first exposure is made with the first aperture stop 16 u having the first ring-shaped aperture 22 and the third ring-shaped aperture 36 formed in, and then the second exposure is made with the second aperture stop 16 v having the second apertures 24 b 1-24 b 4 formed in.
FIG. 41A is a plan view of the first aperture stop 16 u having the first ring-shaped aperture and the third ring-shaped aperture formed in. The first aperture 16 u used in the present modification has the first ring-shaped aperture 22 formed in the center and the third ring-shaped aperture 36 formed around the first aperture 22. The positions, shapes, etc. of the first aperture 22 and the third aperture 36 of the first aperture stop 16 u illustrated in FIG. 41A are the same as the positions, shapes, etc. of the first aperture 22 and the third aperture 36 of the aperture stop 16 k illustrated in FIG. 27.
FIG. 41B is a plan view of the second aperture stop 16 v having the second apertures 24 b 1-24 b 4 in square directions around the center. The positions, shape, etc. of the second apertures 24 b 1-24 b 4 of the second aperture stop 16 v illustrated in FIG. 41B are the same as the positions, shape, etc. of the second apertures 24 b 1-24 b 4 of the aperture stop 16 k illustrated in FIG. 27.
As described above, it is possible that the first exposure is made with the first aperture stop 16 u having the first ring-shaped aperture 22 and the third ring-shaped aperture 36 formed in, and then the second exposure is made with the second aperture stop 16 v having the apertures 24 b 1-24 b 4 formed in.
Next, the semiconductor device manufacturing method according to the present modification will be explained with reference to FIGS. 6A to 6E.
The aperture stop 16 u illustrated in FIG. 41A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
The aperture stop 16 v illustrated in FIG. 41B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
Next, as illustrated in FIG. 6E, the photoresist film 34 is released.
The present modification can produce the same advantageous effects as the third embodiment, in which the aperture stop 16 k is used, and even when the patterns 18 a for forming holes are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, the semiconductor device manufacturing method according to Modification 2 of the present embodiment will be explained with reference to FIGS. 6A to 6E, 42A and 42B. FIGS. 42A and 42B are plan views of the aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the first exposure is made with the first aperture stop 16 w having the first ring-shaped aperture 22 formed in, and the second exposure is made with the second aperture stop 16 x having the second apertures 24 b 1-24 b 4 formed in and the third ring-shaped aperture 36 formed in.
FIG. 42A is a plan view of the first aperture stop 16 w having the first ring-shaped aperture 22 formed in. The first aperture stop 16 w used in the present modification has the first ring-shaped aperture 22 in the center. The position, shape, etc. of the first aperture 22 of the first aperture stop 16 w illustrated in FIG. 42A are the same as the position, shape, etc. of the first aperture 22 of the aperture stop 16 k illustrated in FIG. 27.
FIG. 42B is a plan view of the second aperture 16 x having the third ring-shaped aperture 36 formed in and the second apertures 24 b 1-24 b 4 formed in square directions around the third aperture 36. The positions, shapes, etc. of the second apertures 24 b 1-24 b 4 and the third aperture 36 of the second aperture stop 16 x illustrated in FIG. 42B are the same as the positions, shape, etc. of the second apertures 24 b 1-24 b 4 and the third aperture 36 of the aperture stop 16 k illustrated in FIG. 27.
As described above, it is possible that the first exposure is made with the first aperture stop 16 w having the first ring-shaped aperture 22 formed in, and then the second exposure is made with the second aperture stop 16 x having the apertures 24 b 1-24 b 4 and the third aperture 36 formed in.
Then, the semiconductor device manufacturing method according to the present embodiment will be explained with reference to FIGS. 6A to 6E.
The aperture stop 16 w illustrated in FIG. 42A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 16 x illustrated in FIG. 42B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor device (see FIG. 6B).
Next, as illustrated in FIG. 6D, with the photoresist film 34 as the mask, the inter-layer insulation film 32 is etched. Thus, the patterns of holes, etc. are formed in the inter-layer insulation film 32.
The present modification can produce the same advantageous effects as the third embodiment, in which the exposure is made with the aperture stop 16 k, and even when the patterns 18 a for forming holes are arranged n various directions, the DOF can be surely sufficient, ad the patterns can be stably transferred.
Next, the semiconductor device manufacturing method according to Modification 3 of the present embodiment will be explained with reference to FIGS. 6A to 6E, 43A and 43B. FIGS. 43A and 43B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the first exposure is made with the first aperture stop 16 y having the first aperture 22 and the second apertures 24 b 1-24 b 4 formed in, and the second exposure is made with the second aperture stop 16 z having the third aperture 36 formed in.
FIG. 43A is a plan view of the first aperture stop 16 y having the first aperture 22 and the second apertures 24 b 1-24 b 4 formed in. The first aperture 16 y used in the present embodiment has the first ring-shaped aperture 22 formed in the center and the second apertures 124 b 1-24 b 4 arranged in square directions around the center. The positions, shapes, etc. of the first aperture 22 and the second apertures 24 b 1-24 b 4 of the first aperture stop 16 y illustrated in FIG. 43A are the same as the positions, shapes, etc. of the first aperture 22 and the second apertures 24 b 1-24 b 4 of the aperture stop 16 k illustrated in FIG. 27.
FIG. 43B is a plan view of the second aperture stop 16 z having the third ring-shaped aperture 36 formed in. The position and shape, etc. of the third aperture 36 of the second aperture stop 16 z illustrated in FIG. 43B are the same as the position, shape, etc. of the third aperture 36 of the aperture stop 16 k illustrated in FIG. 27.
As described above, it is possible that the first exposure is made with the first aperture stop 16 y having the first aperture 22 and the second apertures 24 b 1-24 b 4 formed in, and then the second exposure is made with the second aperture stop 16 z having the third aperture 36 formed in.
The aperture stop 16 w illustrated in FIG. 43A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 16 x illustrated in FIG. 43B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
The present modification can produce the same advantageous effects as the third embodiment, in which the exposure is made with the aperture stop 16 k, and even when the patterns 18 a for forming holes are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
The semiconductor device manufacturing method according to a fifth embodiment of the present invention will be explained with reference to FIGS. 6A to 6E and 44. FIG. 44 is a plan view of an aperture stop used in the semiconductor device manufacturing method used in the present embodiment. The same members of the present embodiment as those of the semiconductor device manufacturing method according to the first to the fourth embodiments illustrated in FIGS. 1 to 43B are represented by the same reference numbers not to repeat or to simplify their explanation.
The semiconductor device manufacturing method according to the present embodiment is characterized mainly in that an aperture stop 40 illustrated in FIG. 44 is used to transfer the patterns. That is, the semiconductor device manufacturing method according to the present embodiment is characterized mainly in that the aperture stop 40 having the first circular aperture 38 formed in the center, the second ring-shaped aperture 22 b formed around the first aperture 38 and the third ring-shaped aperture 36 e formed around the second ring-shaped aperture 22 b is used to transfer the patterns.
As illustrated in FIG. 44, the first circular aperture 38 is formed in the center of the aperture stop 40.
Around the first aperture 38, the second ring-shaped aperture 22 b is formed, surrounding the first aperture 38. The inner sigma σin(1) of the second aperture 22 b is set larger than the diameter of the first aperture 38. In other words, the inner diameter of the second aperture 22 b is set larger than the outer diameter of the first aperture 38.
Around the second aperture 22 b, the third ring-shaped aperture 36 e is formed, surrounding the second aperture 22 b. The inner sigma σin(2) of the third aperture 36 e is set larger than the outer sigma σout(1) of the second aperture 22 b. In other words, the inner diameter of the third aperture 36 e is set larger than the outer diameter of the second aperture 22 b.
The respective sizes of the aperture stop 40 are as exemplified below. These sizes are normalized values with the outer diameter of the effective region of the aperture stop 40 set at 1.0.
The diameter of the first aperture 38 is, e.g., 0.1-0.25.
The outer sigma σout(1) of the second aperture 22 b is, e.g., 0.4-0.5. The inner sigma σin(1) of the second aperture 38 is, e.g., 0.2-0.3.
The outer sigma σout(2) of the third aperture 36 e is, e.g., 0.8-0.95. The inner sigma σin(2) of the third aperture 36 e is, e.g., 0.7-0.8.
Thus, the aperture stop 40 of the present embodiment is constituted.
Then, the aperture stop 40 illustrated in FIG. 44 is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
As described above, in the semiconductor device manufacturing method according to the present embodiment, the aperture stop 40 having the first circular aperture 38 formed in the center, the second ring-shaped aperture 22 b formed around the first aperture 38 and the third ring-shaped aperture 36 e formed around the second ring-shaped aperture 22 b is used to transfer the patterns. The first aperture 38 contributes to transferring patterns isolated from the other patterns, i.e., isolated patterns with a relatively high resolution. The second aperture 22 b contributes to transferring patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution. The third aperture 36 e contributes to transferring the patterns arranged at a relatively small pitch with a relatively high resolution. The third aperture 36 e contributes also to transferring with a relatively high resolution the pattern arranged in various directions. Thus, according to the present embodiment, even when the patterns 18 a for forming holes are set at various pitch values and in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
The semiconductor manufacturing method according to a sixth embodiment of the present invention will be explained with reference to FIGS. 6A to 6E and 45A to 45C. FIG. 45A to 45C are plan views of aperture stops used in the semiconductor device manufacturing method according to the present embodiment. The same members of the present embodiment as those of the semiconductor device manufacturing method according to the first to the fifth embodiments illustrated in FIGS. 1 to 44 are represented by the same reference numbers not to repeat or to simplify their explanation.
The semiconductor device manufacturing method according to the present embodiment is characterized mainly in that the first exposure is made with the first aperture stop 40 r having the first circular aperture 38 formed in, then the second exposure is made with the second aperture stop 40 b having the second ring-shaped aperture 22 b formed in, and next the third exposure is made with the third aperture stop 40 c having the third ring-shaped aperture 36 e.
FIG. 45A is a plan view of the first aperture stop 40 a having the first circular aperture 38 formed in the center. The first aperture stop 40 a used in the present embodiment has the first circular aperture 38 formed in the center. The position, shape, etc. of the first aperture 38 of the first aperture stop 40 a illustrated in FIG. 45A are the same as the position, shape, etc. of the first aperture 38 of the aperture stop 40 illustrated in FIG. 44.
FIG. 45B is a plan view of the second aperture stop 40 b having the second ring-shaped aperture 22 b formed in. The position, shape, etc. of the second aperture 22 b of the second aperture stop 40 b illustrated in FIG. 45B are the same as the position, shape, etc. of the second aperture 22 b of the aperture stop 40 illustrated in FIG. 44.
FIG. 45C is a plan view of the third aperture stop 40 c having the third ring-shaped aperture 36 e formed in. The position, shape, etc. of the third aperture 36 e of the third aperture stop 40 c illustrated in FIG. 45C are the same as the position, shape, etc. of the third aperture 36 e of the aperture stop 40 illustrated in FIG. 44.
Next, the semiconductor device according to the present embodiment will be explained with reference to FIGS. 6A to 6E and 45A to 45C.
Next, the aperture stop 40 a illustrated in FIG. 45A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 40 b illustrated in FIG. 45B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Next, the aperture stop 40 c illustrated in FIG. 45C is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (se FIG. 6B).
Next, as illustrated in FIG. 6D, with the photoresist film 34 as the mask, the inter-layer insulation film 32 is etched. Thus, the patterns, as of holes, etc., are formed in the inter-layer insulation film 32.
As described above, in the semiconductor device manufacturing method according to the present embodiment, the patterns formed on the reticle 18 are exposed with the first aperture stop 40 a, then exposed with the second aperture stop 40 b, and then exposed with the third aperture stop 40 c. The exposure with the first aperture stop 40 a contributes to transferring the isolated pattern with a relatively high resolution. The exposure with the second aperture stop 40 b contributes to transferring the patterns arranged at a medium pitch to a relatively large pitch with a relatively high resolution. The exposure with the third aperture stop 40 c contributes to transferring the patterns arranged in various directions with a relatively high resolution. Thus, the present embodiment can produce the same advantageous effects as the exposure with the aperture stop 40 according to the fifth embodiment. That is, according to the present embodiment, even when the patterns 18 a for forming holes are arrange at various pitch values and are arranged in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, the semiconductor device manufacturing method according to Modification 1 of the present embodiment will be explained with reference to FIGS. 6A to 6E, 46A and 46B. FIGS. 46A and 46B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the first exposure is made with the first aperture stop 40 d having the first aperture 38 and the second aperture 22 b formed in, and then the second exposure is made with the second aperture stop 40 e having the third aperture 36 e formed in.
FIG. 46A is a plan view of the first aperture stop 40 d having the first aperture 38 and the second aperture 22 b formed in. The first aperture stop 40 d has the first aperture 38 formed in the center, and the second ring-shaped aperture 22 b formed around the first aperture 38. The positions, shapes, etc. of the first aperture 38 and the second aperture 22 b of the first aperture stop 40 d illustrated in FIG. 46A are the same as the positions, shapes, etc. of the first aperture 38 and the second aperture 22 b of the aperture stop 40 illustrated in FIG. 44.
FIG. 46B is a plan view of the second aperture 40 e having the third aperture 36 e formed in. The shape, position, etc. of the third aperture 36 e of the second aperture stop 40 e illustrated in FIG. 46B are the same as the position, shape, etc. of the third aperture 36 e of the aperture stop 40 illustrated in FIG. 44.
Next, the aperture stop 40 d illustrated in FIG. 46A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Next, the aperture stop 40 e illustrated in FIG. 46B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
As described above, it is possible that the first exposure is made with the first aperture stop 40 a having the first aperture 38 and the second aperture 22 b formed in, and the second exposure is made with the second aperture stop 40 e having the third aperture 36 e formed in.
The present modification can produce the same advantageous effects as the fifth embodiment, in which the aperture stop 40 is used. In the present modification, even when the patterns 18 a for forming holes are set at various pitch values and in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, the semiconductor device manufacturing method according to Modification 2 of the present embodiment will be explained with reference to FIGS. 6A to 6E, 47A and 47B. FIGS. 47A and 47B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the first exposure is made with the first aperture stop 40 f having the first aperture 38 f formed in, and then, the second exposure is made with the second aperture stop 40 g having the second aperture 22 b and the third aperture 36 e formed in.
FIG. 47A is a plan view of the first aperture stop 40 f having the first aperture 38 formed in. The first aperture stop 40 f has the first aperture 38 formed in the center. The position, shape, etc. of the first aperture 38 of the first aperture stop 40 f illustrated in FIG. 47A are the same as the position, shape, etc. of the first aperture 38 of the aperture stop 40 illustrated in FIG. 44A.
FIG. 47B is a plan view of the second aperture stop 40 g having the second aperture 22 b and the third aperture 36 e formed in. The positions, shapes, etc. of the second aperture 22 b and the third aperture 36 e of the second aperture stop 40 g illustrated in FIG. 47B are the same as the positions, shapes, etc. of the second aperture 22 b and the third aperture 36 e of the aperture stop 40 illustrated in FIG. 44.
The aperture stop 40 f illustrated in FIG. 47A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Next, the aperture stop 40 g illustrated in FIG. 47B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
Then, as illustrated in FIG. 6D, with the photoresist film 34 as the mask, the inter-layer insulation film 32 is etched. Thus, the patterns, as of holes, etc., are formed in the inter-layer insulation film 32.
As described above, it is possible that the first exposure is made with the first aperture stop 40 f having the first aperture 38 formed in, and the second exposure is made with the second aperture stop 40 g having the second aperture 22 b and the third aperture 36 e formed in.
The present modification can produce the same advantageous effects as the fifth embodiment, in which the exposure is made with the aperture stop 40. Thus, in the present modification, even when the patterns 18 a for forming holes are formed at various pitch value and in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
Then, the semiconductor device manufacturing method according to Modification 3 of the present embodiment will be explained with reference to FIGS. 6A to 6E, 48A and 48B. FIGS. 48A and 48B are plan views of an aperture stop used in the semiconductor device manufacturing method according to the present modification.
The semiconductor device manufacturing method according to the present modification is characterized mainly in that the first exposure is made with the first aperture stop 40 h having the first aperture 38 and the third aperture 36 e formed in, and then, the second exposure is made with the second aperture stop 40 i having the second aperture 22 b formed in.
FIG. 48A is a plan view of the first aperture stop 40 h having the first aperture 38 and the third aperture 36 e formed in. The first aperture stop 40 h has the first aperture 38 and the third aperture 36 e formed in. The positions, shapes, etc. of the first aperture 38 and the third aperture 36 e of the first aperture stop 40 h illustrated in FIG. 48A are the same as the positions, shapes, etc. of the first aperture 38 and the third aperture 36 e of the aperture stop 40 illustrated in FIG. 44.
FIG. 48B is a plan view of the second aperture stop 40 i having the second aperture 22 b formed in. The position, shape, etc. of the second aperture 22 b of the second aperture 40 i illustrated in FIG. 48B are the same as the position, shape, etc. of the second aperture 22 b of the second aperture stop 40 illustrated in FIG. 44.
Next, the aperture stop 40 h illustrated in FIG. 47A is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20.
Then, the aperture stop 40 i illustrated in FIG. 47B is mounted on the aligner described above with reference to FIG. 1, and the patterns formed on the reticle 18 are transferred to the photoresist film 34 on the semiconductor substrate 20 (see FIG. 6B).
As described above, it is possible that the first exposure is made with the first aperture stop 40 h having the first aperture 38 and the third aperture 36 e formed in, and the second exposure is made with the second aperture stop 40 i having the second aperture 22 b formed in.
The present modification can produce the same advantageous effects as the fifth embodiment, in which the aperture stop 40 is used. Thus, in the present modification, even when the patterns 18 a are formed at various pitch values and in various directions, the DOF can be surely sufficient, and the patterns can be stably transferred.
For example, in the second embodiment, the first exposure is made with the aperture stop 16 e illustrated in FIG. 12A, and the second exposure is made with the aperture stop 16 f illustrated in FIG. 12B. However, it is possible that the aperture stop 16 f illustrated in FIG. 12B is used for the first exposure, and the aperture stop 16 e illustrated in FIG. 12A is used for the second exposure.
In Modification 1 of the second embodiment, the first exposure is made with the aperture stop 16 e illustrated in FIG. 14A, and the second exposure is made with the aperture stop 16 g illustrated in FIG. 14B. However, it is possible that the aperture stop 16 g illustrated in FIG. 14B is used for the first exposure, and the aperture stop 16 e illustrated in FIG. 14A is used for the second exposure.
In Modification 2 of the second embodiment, the first exposure is made with the aperture stop 16 e illustrated in FIG. 15A, and the second exposure is made with the aperture stop 16 h illustrated in FIG. 15B. However, it is possible that the aperture stop 16 h illustrated in FIG. 15B may be used for the first exposure, and the aperture stop 16 e illustrated in FIG. 15A may be used for the second exposure.
In Modification 3 of the second embodiment, the first exposure is made with the aperture stop 16 e illustrated in FIG. 16A, and the second exposure is made with the aperture stop 16 i illustrated in FIG. 16B. However, it is possible that the aperture stop 16 i illustrated in FIG. 16B is used for the first exposure, and the aperture stop 16 e illustrated in FIG. 16A is used for the second exposure.
In Modification 4 of the second embodiment, the first exposure is made with the aperture stop 16 e illustrated in FIG. 17A, and the second exposure is made with the aperture stop 16 j illustrated in FIG. 17B. However, it is possible that the aperture stop 16 j illustrated in FIG. 17B is used for the first exposure, and the aperture stop 16 e illustrated in FIG. 17A is used for the second exposure.
In the fourth embodiment, the first exposure is made with the aperture stop 16 r illustrated in FIG. 40A, the second exposure is made with the aperture stop 16 s illustrated in FIG. 40B, and the third exposure is made with the aperture stop 16 t illustrated in FIG. 40C. However, it is possible that the aperture stop 16 r illustrated in FIG. 40A is used for the first exposure, the aperture stop 16 t illustrated in FIG. 40C is used for the second exposure, and the aperture stop 16 s illustrated in FIG. 40B is used for the third exposure. It is possible that the aperture stop 16 s illustrated in FIG. 40B is used for the first exposure, the aperture stop 16 r illustrated in FIG. 40A is used for the second exposure, and the aperture stop 16 t illustrated in FIG. 40C is used for the third exposure. It is possible that the aperture stop 16 s illustrated in FIG. 40B is used for the first exposure, the aperture stop 16 t illustrated in FIG. 40C is used for the second exposure, and the aperture stop 16 r illustrated in FIG. 40A is used for the third exposure. It is possible that the aperture stop 16 t illustrated in FIG. 40C is used for the first exposure, the aperture stop 16 r illustrated in FIG. 40A is used for the second exposure, and the aperture stop 16 s illustrated in FIG. 40B is used for the third exposure. It is possible that the aperture stop 16 t illustrated in FIG. 40C is used for the first exposure, the aperture stop 16 s illustrated in FIG. 40B is used for the second exposure, and the aperture stop 16 r illustrated in FIG. 40A is used for the third exposure.
In the fourth embodiment, the aperture stop 16 r has the same aperture 22 as the aperture 22 of the aperture stop 16 k (see FIG. 27) formed in, the aperture stop 16 s has the same apertures 24 b 1-24 b 4 as the apertures 24 b 1-24 b 4 of the aperture stop 16 k formed in, the aperture stop 16 t has the same aperture 36 as the aperture 36 of the aperture stop 16 k formed in. However, it is possible that the same aperture 22 as the aperture 22 of the aperture stop 161 (see FIG. 28) is formed in the aperture stop 16 r, the same apertures 24 b 1-24 b 4 as the apertures 24 b 1-24 b 4 of the aperture stop 161 are formed in the aperture stop 16 s, and the same aperture 36 a as the aperture 36 a of the aperture stop 161 is formed in the aperture stop 16 t. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 m (see FIG. 31) is formed in the aperture stop 16 r, the same apertures 24 c 1-24 c 4 as the apertures 24 c 1-24 c 4 of the aperture stop 16 m are formed in the aperture stop 16 s, and the same aperture 36 b as the aperture 36 b of the aperture stop 16 m is formed in the aperture stop 16 t. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 n (see FIG. 34) is formed in the aperture stop 16 r, the same apertures 24 b 1-24 b 4 as the apertures 24 b 1-24 b 4 of the aperture stop 16 n are formed in the aperture stop 16 s, and the same aperture 36 c as the aperture 36 c of the aperture stop 16 n is formed in the aperture stop 16 t. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 o (see FIG. 37) is formed in the aperture stop 16 r, the same apertures 24 b 1-24 b 6 as the apertures 24 b 1-24 b 6 of the aperture stop 16 o are formed in the aperture stop 16 s, and the same aperture 36 as the aperture 36 of the aperture stop 16 o is formed in the aperture stop 16 t. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 p (see FIG. 38) is formed in the aperture stop 16 r, the same apertures 24 b 1-24 b 8 as the apertures 24 b 1-24 b 8 of the aperture stop 16 p are formed in the aperture stop 16 p, and the same aperture 36 as the aperture 36 of the aperture stop 16 p is formed in the aperture stop 16 t.
In Modification 1 of the fourth embodiment, the first exposure is made with the aperture stop 16 u illustrated in FIG. 41A, the second exposure is made with the aperture stop 16 v illustrated in FIG. 41B. However, it is possible that the aperture 16 v illustrated in FIG. 41B is used for the first exposure, and the aperture 16 u illustrated in FIG. 41A is used for the second exposure.
In Modification 1 of the fourth embodiment, the same apertures 22, 36 as the apertures 22, 36 of the aperture stop 16 k (see FIG. 27) are formed in the aperture stop 16 u, and the same apertures 24 b 1-24 b 4 as the apertures 24 b 1-24 b 4 of the aperture stop 16 k are formed in the aperture stop 16 v. However, it is possible that the same apertures 22, 36 a as the apertures 22, 36 a of the aperture stop 161 (see FIG. 28) are formed in the aperture stop 16 u, and the same apertures 24 b 1-24 b 4 as the apertures 24 b 1-24 b 4 of the aperture stop 161 are formed in the aperture stop 16 v. It is possible that the same apertures 22, 36 b as the apertures 22, 36 b of the aperture stop 16 m (see FIG. 31) are formed in the aperture stop 16 u, and the same apertures 24 c 1-24 c 4 as the apertures 24 c 1-24 c 4 of the aperture stop 16 m are formed in the aperture stop 16 v. It is possible that the same apertures 22, 36 c as the apertures 22, 36 c of the aperture stop 16 n (see FIG. 34) are formed in the aperture stop 16 u, and the same apertures 24 b 1-24 b 4 as the apertures 24 b 1-24 b 4 of the aperture stop 16 n are formed in the aperture stop 16 v. It is possible that the same apertures 22, 36 as the apertures 22, 36 of the aperture stop 16 o (see FIG. 37) are formed in the aperture stop 16 u, and the same apertures 24 b 1-24 b 6 as the apertures 24 b 1-24 b 6 of the aperture stop 16 o are formed in the aperture stop 16 v. It is possible that the same apertures 22, 36 as the apertures 22, 36 of the aperture stop 16 p (see FIG. 38) are formed in the aperture stop 16 u, and the same apertures 24 b 1-24 b 8 as the apertures 24 b 1-24 b 8 of the aperture stop 16 p are formed in the aperture stop 16 v.
In Modification 2 of the fourth embodiment, the first exposure is made with the aperture stop 16 w illustrated in FIG. 42A, and the second exposure is made with the aperture stop 16 x illustrated in FIG. 42B. However, it is possible that the aperture stop 16 x illustrated in FIG. 42B is used for the first exposure, and the aperture stop 16 w illustrated in FIG. 42A is used for the second exposure.
In Modification 2 of the fourth embodiment, the same aperture 22 as the aperture 22 of the aperture stop 16 k (see FIG. 27) is formed in the aperture stop 16 w, and the same apertures 24 b 1-24 b 4, 36 as the apertures 24 b 1-24 b 4, 36 of the aperture stop 16 k are formed in the aperture stop 16 x. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 161 (see FIG. 28) is formed in the aperture stop 16 w, and the same apertures 24 b 1-24 b 4, 36 a as the apertures 24 b 1-24 b 4, 36 a of the aperture stop 161 are formed in the aperture stop 16 x. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 m (see FIG. 31) is formed in the aperture stop 16 w, and the same apertures 24 c 1-24 c 4, 36 b as the apertures 24 c 1-24 c 4, 36 b of the aperture stop 16 m are formed in the aperture stop 16 x. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 n (see FIG. 34) is formed in the aperture stop 16 w, and the same apertures 24 b 1-24 b 4, 36 c as the apertures 24 b 1-24 b 4, 36 c of the aperture stop 16 n are formed in the aperture stop 16 x. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 o (see FIG. 37) is formed in the aperture stop 16 w, and the same apertures 24 b 1-24 b 6, 36 as the apertures 24 b 1-24 b 6, 36 of the aperture stop 16 o are formed in the aperture stop 16 x. It is possible that the same aperture 22 as the aperture 22 of the aperture stop 16 p (see FIG. 38) is formed in the aperture stop 16 w, and the same apertures 24 b 1-24 b 8, 36 as the apertures 24 b 1-24 b 8, 36 of the aperture stop 16 p are formed in the aperture stop 16 x.
In Modification 3 of the fourth embodiment, the first exposure is made with the aperture stop 16 y illustrated in FIG. 43A, and the second exposure is made with the aperture stop 16 z illustrated in FIG. 43B. However, it is possible that the aperture stop 16 z illustrated in FIG. 43B is used for the first exposure, and the aperture stop 16 y illustrated in FIG. 43A is used for the second exposure.
In Modification 3 of the fourth embodiment, the same apertures 22, 24 b 1-24 b 4 as the apertures 22, 24 b 1-24 b 4 of the aperture stop 16 k (see FIG. 27) are formed in the aperture stop 16 y, and the same aperture 36 as the aperture 36 of the aperture stop 16 k is formed in the aperture stop 16 z. However, it is possible that the same apertures 22, 24 b 1-24 b 4 as the apertures 22, 24 b 1-24 b 4 of the aperture stop 161 (see FIG. 28) are formed in the aperture stop 16 y, and the same apertures 36 a as the aperture 36 a of the aperture stop 161 is formed in the aperture stop 16 z. It is possible that the same apertures 22, 24 c 1-24 c 4 as the apertures 22, 24 c 1-24 c 4 of the aperture stop 16 m (see FIG. 31) are formed in the aperture stop 16 y, and the same aperture 36 b as the aperture 36 b of the aperture stop 16 m is formed in the aperture stop 16 z. It is possible that the same apertures 22, 24 b 1-24 b 4 as the apertures 22, 24 b 1-24 b 4 of the aperture stop 16 n (see FIG. 34) are formed in the aperture stop 16 y, and the same aperture 36 c as the aperture 36 c of the aperture stop 16 n is formed in the aperture stop 16 z. It is possible that the same apertures 22, 24 b 1-24 b 6 as the apertures 22, 24 b 1-24 b 6 of the aperture stop 16 o (see FIG. 37) are formed in the aperture stop 16 y, and the aperture 36 as the aperture 36 of the aperture stop 16 o is formed in the aperture stop 16 z. It is possible that the same apertures 22, 24 b 1-24 b 8 as the apertures 22, 24 b 1-24 b 8 of the aperture stop 16 p (see FIG. 38) are formed in the aperture stop 16 y, and the same aperture 36 as the aperture 36 of the aperture stop 16 p is formed in the aperture stop 16 z.
In the sixth embodiment, the first exposure is made with the apertures stop 40 a illustrated in FIG. 45A, the second exposure is made with the aperture stop 40 b illustrated in FIG. 45B, and the third exposure is made with the aperture stop 40 c illustrated in FIG. 45C. However, it is possible that the aperture stop 40 a illustrated in FIG. 45A is used for the first exposure, the aperture stop 40 c illustrated in FIG. 45C is used for the second exposure, and the aperture stop 40 b illustrated in FIG. 45B is used for the third exposure. It is possible that the aperture stop 40 b illustrated in FIG. 45B is used for the first exposure, the aperture stop 40 a illustrated in FIG. 45A is used for the second exposure, and the aperture stop 40 c illustrated in FIG. 45C is used for the third exposure. It is possible that the aperture stop 40 b illustrated in FIG. 45B is used for the first exposure, the aperture stop 40 c illustrated in FIG. 45C is used for the second exposure, and the aperture stop 40 a illustrated in FIG. 45A is used for the third exposure. It is possible that the aperture stop 40 c illustrated in FIG. 45C is used for the first exposure, the aperture stop 40 a illustrated in FIG. 45A is used for the second exposure, and the aperture stop 40 b illustrated in FIG. 45B is used for the third exposure. It is possible that the aperture stop 40 c illustrated in FIG. 45C is used for the first exposure, the aperture sop 40 b illustrated in FIG. 45B is used for the second exposure, and the aperture stop 40 a illustrated in FIG. 45A is used for the third exposure.
In Modification 1 of the sixth embodiment, the first exposure is made with the aperture stop 40 d illustrated in FIG. 46A, and the second exposure is made with the aperture stop 40 e illustrated in FIG. 46B. However, it is possible that the aperture stop 40 e illustrated in FIG. 46B is used for the first exposure, and the aperture stop 40 d illustrated in FIG. 46A is used for the second exposure.
In Modification 2 of the sixth embodiment, the first exposure is made with the aperture stop 40 f illustrated in FIG. 47A, and the second exposure is made with the aperture stop 40 g illustrated in FIG. 47B. However, it is possible that the aperture stop 40 g illustrated in FIG. 47B is used for the first exposure, and the aperture stop 40 f illustrated in FIG. 47A is used for the second exposure.
In Modification 3 of the sixth embodiment, the first exposure is made with the aperture stop 40 h illustrated in FIG. 48A, and the second exposure is made with the aperture stop 40 i illustrated in FIG. 48B. However, it is possible that the aperture stop 40 i illustrated in FIG. 48B is used for the first exposure, and the aperture stop 40 h illustrated in FIG. 48A is used for the second exposure.
transferring a pattern formed on a reticle to a semiconductor substrate by an exposure with oblique incidence illumination,
the exposure being made with an illumination source aperture including a first annular-shaped aperture, and a plurality of second apertures formed around the first annular-shaped aperture, a circular-shaped shade region existing in the first annular-shaped aperture,
the illumination source aperture being positioned between a light source of the oblique incidence illumination and the reticle
wherein an area of the first annular-shaped aperture, and a total of areas of said plurality of the second apertures are substantially equal to each other.
the illumination source aperture further includes a third annular-shaped aperture formed around the first annular-shaped aperture, an annular-shaped shade region existing between the first annular-shaped aperture and the third annular-shaped aperture.
a number of said plurality of the second apertures is four or more.
a diameter of the second apertures is smaller than an outer diameter of the first annular-shaped aperture.
the second apertures are arranged inside an effective range of the illumination source aperture.
the reticle further has an assist pattern arranged near the pattern.
the illumination source aperture being positioned between a light source of the oblique incidence illumination and the reticle,
wherein the second apertures are positioned partially outside an effective range of the illumination source aperture.
wherein third apertures are further formed respectively between said plurality of the second apertures around the first annular-shaped aperture, and
the third apertures are partially positioned in the first annular-shaped aperture.
a diameter of the third aperture is smaller than a diameter of the second aperture.
wherein the illumination source aperture further includes a third annular-shaped aperture formed around the first annular-shaped aperture, an annular-shaped shade region existing between the first annular-shaped aperture and the third annular-shaped aperture, and
the second apertures are positioned outside the third aperture.
the second apertures are partially positioned in the third aperture.
the second apertures are positioned inside the third aperture.
the illumination source aperture further includes a fourth aperture formed inside the first annular-shaped aperture.
US11/698,062 2006-01-27 2007-01-26 Semiconductor device manufacturing method Active 2028-10-18 US8349540B2 (en)
JP2006-19549 2006-01-27
JP2006019549 2006-01-27
JP2006-019549 2006-01-27
JP2006355162A JP5103901B2 (en) 2006-01-27 2006-12-28 Manufacturing method of semiconductor device
JP2006-355162 2006-12-28
US13/218,585 US8349541B2 (en) 2006-01-27 2011-08-26 Semiconductor device manufacturing method
US13/218,585 Division US8349541B2 (en) 2006-01-27 2011-08-26 Semiconductor device manufacturing method
US20070178411A1 US20070178411A1 (en) 2007-08-02
US8349540B2 true US8349540B2 (en) 2013-01-08
ID=38322480
US11/698,062 Active 2028-10-18 US8349540B2 (en) 2006-01-27 2007-01-26 Semiconductor device manufacturing method
US13/218,585 Active US8349541B2 (en) 2006-01-27 2011-08-26 Semiconductor device manufacturing method
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