Source: https://patents.google.com/patent/JP5310632B2/en
Timestamp: 2020-02-19 20:05:24
Document Index: 516032829

Matched Legal Cases: ['Application No. 2004', 'art 55', 'art 21', 'art 21', 'art 70', 'art 7', 'art 7']

JP5310632B2 - Exposure apparatus, exposure method, and device manufacturing method - Google Patents
JP5310632B2
JP5310632B2 JP2010087336A JP2010087336A JP5310632B2 JP 5310632 B2 JP5310632 B2 JP 5310632B2 JP 2010087336 A JP2010087336 A JP 2010087336A JP 2010087336 A JP2010087336 A JP 2010087336A JP 5310632 B2 JP5310632 B2 JP 5310632B2
JP2010087336A
JP2010153931A (en
JP2010153931A5 (en
2010-04-05 Application filed by 株式会社ニコン filed Critical 株式会社ニコン
2010-04-05 Priority to JP2010087336A priority patent/JP5310632B2/en
2010-07-08 Publication of JP2010153931A publication Critical patent/JP2010153931A/en
2011-08-11 Publication of JP2010153931A5 publication Critical patent/JP2010153931A5/ja
2013-10-09 Publication of JP5310632B2 publication Critical patent/JP5310632B2/en
An exposure apparatus is provided which can supply and collect a liquid in a prescribed state, and that can suppress degradation of a pattern image projected onto a substrate. The exposure apparatus is provided with a nozzle member having a supply outlet that supplies a liquid and a collection inlet that collects a liquid, and a vibration isolating mechanism that supports the nozzle member and vibrationally isolates the nozzle member from a lower side step part of a main column .
The present invention relates to an exposure apparatus that exposes a substrate through a liquid, an exposure method, and a device manufacturing method that uses this exposure apparatus and exposure method.
This application claims priority with respect to Japanese Patent Application No. 2004-89348 for which it applied on March 25, 2004, and uses the content here.
If the depth of focus δ becomes too narrow, it becomes difficult to match the substrate surface with the image plane of the projection optical system, and the focus margin during the exposure operation may be insufficient. Therefore, as a method for substantially shortening the exposure wavelength and increasing the depth of focus, for example, a liquid immersion method disclosed in Patent Document 1 below has been proposed. In this immersion method, a space between the front end surface (lower surface) of the projection optical system and the substrate surface is filled with a liquid such as water or an organic solvent, and the wavelength of exposure light in the liquid is 1 / n (n The resolution is improved by utilizing the fact that the refractive index of the liquid is usually about 1.2 to 1.6), and the depth of focus is expanded about n times. To the extent permitted by national laws and regulations of the designated country (or selected selected country) designated in this international application, the disclosure of the following pamphlet is incorporated and made a part of this specification.
By the way, in the above prior art, supply and recovery of the liquid are performed using a nozzle. When vibration generated by the nozzle is transmitted to, for example, the projection optical system, the liquid is projected onto the substrate via the projection optical system and the liquid. There is a possibility that the pattern image to be deteriorated. Further, the position of the nozzle may fluctuate due to a change in the pressure of the liquid, and it may be difficult to supply and recover the liquid in a desired state.
The present invention has been made in view of such circumstances, and an exposure apparatus capable of supplying and recovering a liquid in a desired state and suppressing deterioration of a pattern image projected on a substrate, and It is an object of the present invention to provide a device manufacturing method using this exposure apparatus.
In order to solve the above-described problems, the present invention adopts the following configuration corresponding to FIGS. 1 to 6 shown in the embodiment.
An exposure apparatus (EX) according to the present invention includes a supply port (12) for supplying a liquid (LQ) and a recovery port for recovering the liquid (LQ) in the exposure apparatus that exposes the substrate (P) through the liquid (LQ). A nozzle member (70) having at least one of (22) and an anti-vibration mechanism (60) for isolating and supporting the nozzle member (70) with respect to a predetermined support member (7, 1) are provided. It is characterized by that.
According to the present invention, since the anti-vibration mechanism that provides anti-vibration support for the nozzle member with respect to the predetermined support member is provided, it is possible to suppress the influence of vibration generated by the nozzle member on the exposure accuracy. Therefore, deterioration of the pattern image projected on the substrate can be prevented.
An exposure apparatus (EX) according to the present invention includes a supply port (12) for supplying a liquid (LQ) and a recovery port for recovering the liquid (LQ) in the exposure apparatus that exposes the substrate (P) through the liquid (LQ). A nozzle member (70) having at least one of (22), a support member (7, 1) supporting the nozzle member (70), and a support member (7, 1) and a nozzle member (70). And an adjustment mechanism (60) for adjusting the positional relationship.
According to the present invention, the position of the nozzle member with respect to the support member can be adjusted by the adjustment mechanism, and the liquid can be supplied and recovered to form the liquid immersion region with the nozzle member disposed at the optimum position. it can. Therefore, it is possible to form a liquid immersion region well and perform liquid immersion exposure with high accuracy.
An exposure apparatus (EX) of the present invention is an exposure apparatus that exposes a substrate (P) through an optical system (PL) and a liquid (LQ), and a supply port (12) for supplying the liquid (LQ) and a liquid (LQ). ), A nozzle member (70) that has at least one of the recovery ports (22) for recovering, and is supported by a predetermined support member (7, 1), an optical system (PL), and a nozzle member (70). And an adjustment mechanism (60) for adjusting the positional relationship with
According to the present invention, the position of the nozzle member relative to the optical system can be adjusted by the adjustment mechanism, and the supply and recovery of the liquid for forming the liquid immersion area can be performed with the nozzle member arranged at the optimum position. it can. Therefore, it is possible to form a liquid immersion region well and perform liquid immersion exposure with high accuracy.
An exposure apparatus (EX) according to the present invention includes a supply port (12) for supplying a liquid (LQ) and a recovery port for recovering the liquid (LQ) in the exposure apparatus that exposes the substrate (P) through the liquid (LQ). A nozzle member (70) having at least one of (22) and supported by a predetermined support member (7, 1), a substrate stage (PST) holding the substrate (P), and a support member ( 7, 1) having a drive device (61, 62, 63) for driving the nozzle member (70), and adjusting mechanism (60) for adjusting the positional relationship between the substrate stage (PST) and the nozzle member (70). ).
According to the present invention, the position of the nozzle member with respect to the substrate stage can be adjusted by the adjustment mechanism, and the liquid can be supplied and recovered to form the liquid immersion region with the nozzle member arranged at the optimum position. it can. Therefore, it is possible to form a liquid immersion region well and perform liquid immersion exposure with high accuracy.
An exposure apparatus (EX) according to another aspect of the present invention is an exposure apparatus that exposes a substrate (P) through a liquid (LQ), and includes a supply port (12) for supplying the liquid (LQ) and a liquid ( LQ) is provided with a nozzle member (70) having at least one of recovery ports (22), and at least a part of the nozzle member (70) is in the direction of the optical axis (AX) of exposure light that exposes the substrate (P). It was configured to be movable.
The device manufacturing method of the present invention uses the above-described exposure apparatus (EX). According to the present invention, since a pattern image can be accurately transferred onto a substrate, a device having desired performance can be manufactured.
According to the present invention, liquid supply and recovery can be performed in a desired state, and deterioration of a pattern image projected on a substrate can be suppressed.
It is a schematic block diagram which shows one Embodiment of the exposure apparatus of this invention. It is a side view which shows the nozzle member vicinity. It is a top view which shows a nozzle member. It is a side view which shows another embodiment of the exposure apparatus of this invention. It is a side view which shows another embodiment of the exposure apparatus of this invention. It is a flowchart figure which shows an example of the manufacturing process of a semiconductor device.
The exposure apparatus and device manufacturing method of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic block diagram showing an embodiment of the exposure apparatus of the present invention.
The control device CONT includes various measuring means (for example, interferometers 35 and 45, a focus / leveling detection system, nozzle position measuring devices 84 to 86) and a driving device (for example, a mask stage driving device and a substrate stage driving) of the exposure apparatus EX. Devices, nozzle drive devices 61 to 63, etc.), and the measurement results and drive commands can be transmitted between them.
The exposure apparatus EX further includes a main column 1 that supports the mask stage MST and the projection optical system PL. The main column 1 is installed on a base plate BP placed horizontally on the floor surface. The main column 1 is formed with an upper step 3 and a lower step 7 that protrude inward.
The exposure apparatus EX of the present embodiment is an immersion exposure apparatus to which an immersion method is applied in order to improve the resolution by substantially shortening the exposure wavelength and substantially increase the depth of focus. A liquid supply mechanism 10 for supplying the liquid LQ to the substrate P, and a liquid recovery mechanism 20 for recovering the liquid LQ on the substrate P. In the exposure apparatus EX, at least during transfer of the pattern image of the mask M onto the substrate P, the liquid LQ supplied from the liquid supply mechanism 10 applies liquid to a part of the substrate P including the projection area AR1 of the projection optical system PL. An immersion area AR2 is formed. Specifically, the exposure apparatus EX fills the liquid LQ between the optical element 2 at the image plane side tip of the projection optical system PL and the surface of the substrate P, and between the projection optical system PL and the substrate P. The substrate P is exposed by projecting the pattern image of the mask M onto the substrate P via the liquid LQ and the projection optical system PL.
The illumination optical system IL is supported by a support column 4 fixed to the upper part of the main column 1. The illumination optical system IL illuminates the mask M supported by the mask stage MST with the exposure light EL, and the exposure light source, and an optical integrator and an optical integrator for uniformizing the illuminance of the light beam emitted from the exposure light source A condenser lens that collects the exposure light EL from the light source, a relay lens system, and a variable field stop that sets the illumination area on the mask M by the exposure light EL in a slit shape. A predetermined illumination area on the mask M is illuminated with the exposure light EL having a uniform illuminance distribution by the illumination optical system IL. As the exposure light EL emitted from the illumination optical system IL, for example, far ultraviolet light (g-line, h-line, i-line) and KrF excimer laser light (wavelength 248 nm) emitted from a mercury lamp, DUV light), vacuum ultraviolet light (VUV light) such as ArF excimer laser light (wavelength 193 nm) and F 2 laser light (wavelength 157 nm), or the like is used. In this embodiment, ArF excimer laser light is used.
The mask stage MST supports the mask M, and has an opening 36 through which a pattern image of the mask M passes. A mask surface plate 31 is supported on the upper step 3 of the main column 1 via a vibration isolation unit 33. An opening 37 that allows the pattern image of the mask M to pass therethrough is also formed at the center of the mask surface plate 31. A plurality of gas bearings (air bearings) 32 which are non-contact bearings are provided on the lower surface of the mask stage MST.
The mask stage MST is supported in a non-contact manner on the upper surface (guide surface) 31A of the mask surface plate 31 by an air bearing 32, and is perpendicular to the optical axis AX of the projection optical system PL by a mask stage driving device such as a linear motor. It can move two-dimensionally in the plane, that is, in the XY plane, and can rotate in the θZ direction. A movable mirror 34 is provided at a predetermined position on the + X side on the mask stage MST. A laser interferometer 35 is provided at a position facing the moving mirror 34. Similarly, although not shown, a moving mirror is also provided on the + Y side on the mask stage MST, and a laser interferometer is provided at a position facing this. The position of the mask M on the mask stage MST in the two-dimensional direction and the rotation angle in the θZ direction (including rotation angles in the θX and θY directions in some cases) are measured in real time by the laser interferometer 35, and the measurement result is the control device Output to CONT. The control device CONT is connected to the laser interferometer 35 and the mask stage driving device, and the mask M supported by the mask stage MST by driving the mask stage driving device based on the measurement result of the laser interferometer 35. Perform positioning.
The projection optical system PL projects and exposes the pattern of the mask M onto the substrate P at a predetermined projection magnification β, and is an optical element provided at the terminal portion on the substrate P side (image plane side of the projection optical system PL). (Lens) 2 includes a plurality of optical elements, and these optical elements are supported by a lens barrel PK. In the present embodiment, the projection optical system PL is a reduction system having a projection magnification β of, for example, 1/4 or 1/5. Note that the projection optical system PL may be either an equal magnification system or an enlargement system. Further, the optical element (lens) 2 at the tip of the projection optical system PL of the present embodiment is provided so as to be detachable (replaceable) with respect to the lens barrel PK, and the liquid LQ in the liquid immersion area AR2 is provided in the optical element 2. Touch.
The optical element 2 is made of meteorite. Since meteorite has high affinity with water, the liquid LQ can be brought into close contact with almost the entire liquid contact surface 2A of the optical element 2. That is, in the present embodiment, the liquid (water) LQ having high affinity with the liquid contact surface 2A of the optical element 2 is supplied, so that the adhesion between the liquid contact surface 2A of the optical element 2 and the liquid LQ is high. And the optical path between the optical element 2 and the substrate P can be reliably filled with the liquid LQ. The optical element 2 may be quartz having a high affinity with water. Further, the liquid contact surface 2A of the optical element 2 may be subjected to hydrophilic (lyophilic) treatment such as adhesion of MgF 2 , Al 2 O 3 , SiO 2 or the like to further increase the affinity with the liquid LQ. Good.
A flange portion 8 is provided on the outer peripheral portion of the lens barrel PK. A lens barrel surface plate 5 is supported on the upper surface of the lower step portion 7 of the main column 1 via a vibration isolation unit 6. The lens barrel PK is supported by the lens barrel base plate 5 by engaging the flange portion 8 with the lens barrel base plate 5. The projection optical system PL is configured to be supported by the lower step portion 7 of the main column 1 via the lens barrel surface plate 5 and the vibration isolation unit 6.
The substrate stage PST is provided so as to be movable while holding the substrate P via the substrate holder PH. A recess 46 is provided on the substrate stage PST, and the substrate holder PH is disposed in the recess 46. The upper surface 47 of the substrate stage PST other than the recesses 46 is a flat surface (flat portion) that is substantially the same height (level) as the surface of the substrate P held by the substrate holder PH.
By providing an upper surface 47 that is substantially flush with the surface of the substrate P around the substrate P, the liquid LQ is held on the image plane side of the projection optical system PL even when the edge region E of the substrate P is subjected to immersion exposure. Thus, the liquid immersion area AR2 can be satisfactorily formed. Further, although there is a gap of about 0.1 to 2 mm between the edge portion of the substrate P and the upper surface 47, the liquid LQ hardly flows into the gap due to the surface tension of the liquid LQ, and the vicinity of the periphery of the substrate P. In the case of exposing the liquid LQ, the upper surface 47 can hold the liquid LQ below the projection optical system PL.
The upper surface 47 of the substrate stage PST is liquid-repellent and has liquid repellency. As the liquid repellent treatment of the upper surface 47, for example, a liquid repellent material such as a fluorine resin material or an acrylic resin material is applied, or a thin film made of the liquid repellent material is attached. As the liquid repellent material for making it liquid repellent, a material that is insoluble in the liquid LQ is used. Note that the whole or part of the substrate stage PST may be formed of a material having liquid repellency such as a fluorine-based resin such as polytetrafluoroethylene (Teflon (registered trademark)).
A plurality of gas bearings (air bearings) 42 which are non-contact bearings are provided on the lower surface of the substrate stage PST. A substrate surface plate 41 is supported on the base plate BP via a vibration isolation unit 43. The substrate stage PST is supported in a non-contact manner on the upper surface (guide surface) 41A of the substrate surface plate (base portion) 41 by an air bearing 42, and is driven by a substrate stage driving device including linear motors 51, 52, 53, which will be described later. The projection optical system PL can move two-dimensionally in a plane perpendicular to the optical axis AX of the projection optical system PL, that is, in the XY plane, and can rotate in the θZ direction. Further, the substrate stage PST is provided so as to be movable in the Z-axis direction, the θX direction, and the θY direction.
The substrate stage PST is supported by the X guide stage 54 so as to be movable in the X-axis direction. The substrate stage PST is supported in a non-contact manner by a magnetic guide composed of a magnet and an actuator that maintain a predetermined amount of gap in the Z-axis direction with respect to the X guide stage 54. The substrate stage PST is movable with a predetermined stroke in the X-axis direction by the X linear motor 53 while being guided by the X guide stage 54. The X linear motor 53 includes a stator 53A provided on the X guide stage 54 so as to extend in the X-axis direction, and a mover 53B provided corresponding to the stator 53A and fixed to the substrate stage PST. Yes. Then, when the mover 53B is driven with respect to the stator 53A, the substrate stage PST moves in the X-axis direction. The substrate stage PST is moved in the X-axis direction by the X linear motor 53 while being supported in a non-contact manner by the X guide stage 54.
At both ends in the longitudinal direction of the X guide stage 54, a pair of Y linear motors 51 and 52 are provided that can move the X guide stage 54 together with the substrate stage PST in the Y axis direction. Each of the Y linear motors 51 and 52 includes movers 51B and 52B provided at both ends in the longitudinal direction of the X guide stage 54, and stators 51A and 52A provided corresponding to the movers 51B and 52B. ing. The stators 51A and 51B are supported on the base plate BP. Then, when the movers 51B and 52B are driven with respect to the stators 51A and 52A, the X guide stage 54 moves in the Y axis direction together with the substrate stage PST. Further, by adjusting the driving of each of the Y linear motors 51 and 52, the X guide stage 54 can be rotated and moved also in the θZ direction. Therefore, the Y linear motors 51 and 52 enable the substrate stage PST to move in the Y axis direction and the θZ direction almost integrally with the X guide stage 54.
Guide portions 55 and 55 for guiding the movement of the X guide stage 54 in the Y-axis direction are provided on both sides of the substrate surface plate 41 with respect to the X-axis direction. The guide part 55 is supported on the base plate BP. On the other hand, a concave guided member 57 is provided at each of both ends in the longitudinal direction of the lower surface of the X guide stage 54. The guide portion 55 engages with the guided member 57 and is provided so that the upper surface (guide surface) of the guide portion 55 and the inner surface of the guided member 57 face each other. A gas bearing (air bearing) 56 that is a non-contact bearing is provided on the guide surface of the guide portion 55, and the X guide stage 54 is supported in a non-contact manner with respect to the guide surface.
The substrate stage driving device including the linear motors 51, 52, 53 is connected to the control device CONT, and the control device CONT controls the substrate stage driving device. The exposure apparatus EX also includes a focus / leveling detection system (not shown) that detects the position of the surface of the substrate P supported by the substrate stage PST. The focus / leveling detection system is connected to the control device CONT, and the control device CONT controls the focus position (Z position) and tilt angle of the substrate P on the substrate stage PST based on the detection result of the focus / leveling detection system. Then, the surface of the substrate P is adjusted to the image plane of the projection optical system PL by the autofocus method and the autoleveling method.
A movable mirror 44 is provided on the substrate stage PST. The upper surface of the movable mirror 44 is substantially flush with the upper surface 47 of the substrate stage PST. Similarly to the upper surface 47 of the substrate stage PST, the upper surface of the movable mirror 44 is also made liquid repellent and has liquid repellency. A laser interferometer 45 is provided at a position facing the moving mirror 44. The two-dimensional position and rotation angle of the substrate P on the substrate stage PST are measured in real time by the laser interferometer 45, and the measurement result is output to the control device CONT. The laser interferometer 45 and the substrate stage driving device are connected to the control device CONT, and the control device CONT is supported by the substrate stage PST by driving the substrate stage driving device based on the measurement result of the laser interferometer 45. The substrate P is positioned in the XY plane.
The liquid supply mechanism 10 is for supplying a predetermined liquid LQ to the image plane side of the projection optical system PL, and includes a liquid supply unit 11 capable of delivering the liquid LQ and one end of the liquid supply unit 11. Supply pipe 13 (13A, 13B) to be connected is provided. The liquid supply unit 11 includes a tank that stores the liquid LQ, a pressure pump, and the like. The control device CONT is connected to the liquid supply unit 11, and the liquid supply operation of the liquid supply unit 11 is controlled by the control device CONT. When forming the liquid immersion area AR2 on the substrate P, the liquid supply mechanism 10 supplies the liquid LQ onto the substrate P.
The liquid recovery mechanism 20 is for recovering the liquid LQ on the image plane side of the projection optical system PL, and has a liquid recovery part 21 that can recover the liquid LQ and one end connected to the liquid recovery part 21. The recovery pipe 23 (23A, 23B) is provided. The liquid recovery unit 21 includes, for example, a vacuum system (a suction device) such as a vacuum pump, a gas-liquid separator that separates the recovered liquid LQ and gas, and a tank that stores the recovered liquid LQ. As a vacuum system, a vacuum system in a factory where the exposure apparatus EX is disposed may be used without providing the exposure apparatus EX with a vacuum pump. The control device CONT is connected to the liquid recovery unit 21, and the liquid recovery operation of the liquid recovery unit 21 is controlled by the control device CONT. In order to form the immersion area AR2 on the substrate P, the liquid recovery mechanism 20 recovers a predetermined amount of the liquid LQ on the substrate P supplied from the liquid supply mechanism 10.
Of the plurality of optical elements constituting the projection optical system PL, a nozzle member 70 is disposed in the vicinity of the optical element 2 in contact with the liquid LQ. The nozzle member 70 is supported in an anti-vibration manner by the anti-vibration mechanism 60 with respect to the lower step portion 7 of the main column 1. The nozzle member 70 is an annular member provided so as to surround the side surface of the optical element 2 above the substrate P (substrate stage PST), and constitutes a part of each of the liquid supply mechanism 10 and the liquid recovery mechanism 20. It is.
The nozzle member 70 is made of, for example, aluminum, titanium, stainless steel, duralumin, or an alloy containing these. Alternatively, the nozzle member 70 may be configured by a transparent member (optical member) having optical transparency such as glass (quartz).
Next, the nozzle member 70 will be described with reference to FIGS. 2 is an enlarged side view of the vicinity of the nozzle member 70, and FIG. 3 is a plan view of the nozzle member 70 as viewed from above.
The nozzle member 70 includes a liquid supply port 12 (12A, 12B) provided above the substrate P (substrate stage PST) and disposed so as to face the surface of the substrate P. In the present embodiment, the nozzle member 70 has two liquid supply ports 12A and 12B. The liquid supply ports 12 </ b> A and 12 </ b> B are provided on the lower surface 70 </ b> A of the nozzle member 70.
Moreover, the nozzle member 70 has the supply flow path 14 (14A, 14B) corresponding to the liquid supply port 12 (12A, 12B) in the inside. The supply pipes 13 (13A, 13B) are provided in plural (two) so as to correspond to the liquid supply ports 12A, 12B and the supply flow paths 14A, 14B.
Furthermore, the nozzle member 70 includes a liquid recovery port 22 (22A, 22B) provided above the substrate P (substrate stage PST) and disposed so as to face the surface of the substrate P. In the present embodiment, the nozzle member 70 has two liquid recovery ports 22A and 22B. The liquid recovery ports 22A and 22B are provided on the lower surface 70A of the nozzle member 70.
Moreover, the nozzle member 70 has the collection | recovery flow paths 24 (24A, 24B) corresponding to the liquid collection ports 22A and 22B in the inside. A plurality (two) of the recovery pipes 23 (23A, 23B) are provided so as to correspond to the liquid recovery ports 22A, 22B and the recovery flow paths 24A, 24B.
The other ends of the supply pipes 13A and 13B are connected to one end of a tube member 16 (16A and 16B) that can be expanded and contracted and has flexibility. One ends of the supply channels 14A and 14B are connected to the other ends of the tube members 16A and 16B, and the other ends of the supply channels 14A and 14B are connected to the liquid supply ports 12A and 12B.
The other ends of the recovery pipes 23A and 23B are connected to one end of a tube member 26 (26A and 26B) that is extendable and flexible. One ends of the recovery channels 24A and 24B are connected to the other ends of the tube members 26A and 26B, and the other ends of the recovery channels 24A and 24B are connected to the liquid recovery ports 22A and 22B.
The liquid supply ports 12A and 12B constituting the liquid supply mechanism 10 are provided at respective positions on both sides in the X-axis direction across the projection area AR1 of the projection optical system PL, and the liquid recovery ports constituting the liquid recovery mechanism 20 22A and 22B are provided outside the liquid supply ports 12A and 12B of the liquid supply mechanism 10 with respect to the projection area AR1 of the projection optical system PL. As shown in FIG. 3, the projection area AR1 of the projection optical system PL in the present embodiment is set in a rectangular shape in plan view with the Y axis direction as the long direction and the X axis direction as the short direction. Each of the liquid supply ports 12A and 12B is formed in a slit shape in which the Y-axis direction is a longitudinal direction and both end portions thereof are bent inward.
Each of the liquid recovery ports 22A and 22B is formed in a slit shape in which the Y-axis direction is a longitudinal direction and both ends thereof are bent inward, and is provided so as to surround the liquid supply ports 12A and 12B and the projection area AR1. ing.
The lower surface (liquid contact surface) 70 </ b> A of the nozzle member 70 is lyophilic (hydrophilic) like the liquid contact surface 2 </ b> A of the optical element 2. The lower surface 70A of the nozzle member 70 is a substantially flat surface, the lower surface 2A of the optical element 2 is also a flat surface, and the lower surface 70A of the nozzle member 70 and the lower surface 2A of the optical element 2 are substantially flush. Yes. Thereby, the liquid immersion area AR2 can be satisfactorily formed in a wide range.
The nozzle member 70 includes a main body portion 70B in which the supply channel 14 and the recovery channel 24 are formed, and a flange portion 70T outside the main body portion 70B. Further, the lower step portion 7 of the main column 1 is formed with a concave portion 7H facing inward where the flange portion 70T of the nozzle member 70 can be disposed.
The anti-vibration mechanism 60 provides vibration-proof support for the nozzle member 70 to the lower step portion 7 of the main column 1, and connects the recess 7 </ b> H of the lower step portion 7 and the flange portion 70 </ b> T of the nozzle member 70. A plurality of nozzle drive devices 61 (61A to 61C), 62 (62A) and 63 (63A to 63C) that perform active vibration isolation of the nozzle member 70 with respect to the lower step portion 7 of the main column 1 An anti-vibration mechanism 65 and a passive anti-vibration mechanism 72 (72A to 72C) for passively anti-vibrating and supporting the collar portion 70T of the nozzle member 70 with respect to the bottom surface 7A of the recess 7H of the lower step portion 7 are provided. .
The nozzle driving devices 61 to 63 are configured by, for example, a voice coil motor or a linear motor that is driven by a Lorentz force. A voice coil motor or the like driven by Lorentz force has a coil part and a magnet part, and the coil part and the magnet part are driven in a non-contact state. Therefore, it is possible to suppress the occurrence of vibration by configuring the nozzle driving devices 61 to 63 by a driving device that is driven by a Lorentz force such as a voice coil motor.
Further, the passive vibration isolation mechanism 72 is constituted by, for example, an air spring (air cylinder, air bellows) or the like, and supports the nozzle member 70 by vibration isolation by the elastic action of gas (air). In the present embodiment, as shown in FIG. 3, a plurality (three) of passive vibration isolation mechanisms 72 (72A to 72C) are provided so as to surround the projection optical system PL.
Further, the vibration isolation mechanism 60 supports the nozzle member 70 in a state where it is separated from the projection optical system PL (optical element 2). Since the nozzle member 70 and the projection optical system PL (optical element 2) are supported apart from each other, vibration generated in the nozzle member 70 is not directly transmitted to the projection optical system PL.
The liquid supply mechanism 10 and the liquid recovery mechanism 20 are supported separately from the lens barrel surface plate 5 by a predetermined support mechanism. Thereby, the vibration generated in the liquid supply mechanism 10 and the liquid recovery mechanism 20 is not transmitted to the projection optical system PL via the lens barrel surface plate 5.
The active vibration isolation mechanism 65 connects the inner side surface 7B on the X side of the concave portion 7H of the lower stepped portion 7 and the side surface on the X side of the nozzle member 70, and is connected to the inner surface 7B (lower stepped portion 7). The X driving device 61 (61A to 61C) that drives the member 70 in the X-axis direction is connected to the inner side surface 7B on the Y side of the recess 7H of the lower stepped portion 7 and the Y side surface of the nozzle member 70, Y driving device 62 (62A) for driving nozzle member 70 in the Y-axis direction with respect to side surface 7B (lower stepped portion 7), ceiling surface 7C of recess 7H of lower stepped portion 7, and the upper surface of nozzle member 70 And a Z driving device 63 (63A to 63C) for driving the nozzle member 70 in the Z-axis direction with respect to the ceiling surface 7C (lower stepped portion 7).
These driving devices 61 to 63 and the control device CONT are connected, and the control device CONT controls the driving of the driving devices 61 to 63.
In the present embodiment, the vibration isolation mechanism 60 includes a plurality (three) of X drive devices 61. Specifically, the vibration isolation mechanism 60 includes two X driving devices 61A and 61B provided side by side in the Y-axis direction on the + X side of the nozzle member 70, and X driving provided on the −X side of the nozzle member 70. 61C. The control device CONT can move (translate) the nozzle member 70 in the X-axis direction by driving the plurality of X drive devices 61A to 61C with the same drive amount.
Further, the nozzle member 70 can be moved (rotated) in the θZ direction by driving the plurality of X driving devices 61A to 61C with different driving amounts.
In the present embodiment, the vibration isolation mechanism 60 includes one Y drive device 62. Specifically, the vibration isolation mechanism 60 includes a Y drive device 62A provided on the −Y side of the nozzle member 70. The control device CONT can move (translate) the nozzle member 70 in the Y-axis direction by driving the Y drive device 62A.
In the present embodiment, the vibration isolation mechanism 60 includes a plurality (three) of Z drive devices 63. Specifically, the image stabilization mechanism 60 includes three Z driving devices 63A, 63B, and 63C that are provided on the + Z side of the nozzle member 70 and are provided so as to surround the projection optical system PL. The control device CONT can move (translate) the nozzle member 70 in the Z-axis direction by driving the plurality of Z drive devices 63A to 63C with the same drive amount. Moreover, the nozzle member 70 can be moved (rotated) in the θX direction and the θY direction by driving the plurality of Z driving devices 63A to 63C with different driving amounts.
As described above, the vibration isolation mechanism 60 drives the nozzle member 60 with respect to the directions of six degrees of freedom (X-axis, Y-axis, Z-axis, θX, θY, and θZ directions) by the plurality of driving devices 61 to 63. Can do.
In the present embodiment, the same number of passive drive mechanisms 72 (72A to 72C) and Z drive devices 63 (63A to 63C) are provided. Further, as shown in FIG. 3, each of the passive drive mechanisms 72A to 72C and each of the Z drive devices 63A to 63C are arranged close to each other.
The number and arrangement of the X driving device 61, the Y driving device 62, and the Z driving device 63 can be arbitrarily set. For example, you may provide the Z drive device 63 so that the lower surface of the collar part 70T of the nozzle member 70 and the bottom face 7A of the recessed part 7T of the lower step part 7 may be connected. Alternatively, one X driving device 61 and two Y driving devices 62 may be provided. In short, it is only necessary that the nozzle member 70 can be driven in the direction of six degrees of freedom using the plurality of driving devices 61 to 63.
Further, the action points on the nozzle member 70 of the passive drive mechanism 72 (72A to 72C) and the action points on the nozzle member 70 of the Z drive device 63 (63A to 63C) are made to coincide on the XY plane. Thus, you may set so that each corresponding action point may be located on the same line (axis).
The exposure apparatus EX includes a temperature control system (cooling system) (not shown) that performs temperature adjustment (cooling) of the driving devices 61 to 63. Since the driving devices 61 to 63 serve as heat generation sources, fluctuations in the environment (temperature) in which the exposure apparatus EX is placed can be suppressed by cooling using the cooling system. The cooling system may perform cooling using the liquid LQ for immersion exposure, or may perform cooling using a predetermined cooling liquid (refrigerant) different from the liquid LQ for immersion exposure. Also good.
Further, the exposure apparatus EX includes a nozzle position measuring device 80 that measures the positional relationship between the lower step portion 7 of the main column 1 and the nozzle member 70. In the present embodiment, the nozzle position measuring device 80 is configured by a laser interferometer. The nozzle position measuring device 80 is an X interferometer 81 (81A, 81B) that measures the distance (relative position) between the X side inner surface 7B of the recess 7H of the lower stepped portion 7 and the X side surface of the nozzle member 70. A Y interferometer 82 (82A) for measuring the distance (relative position) between the Y side inner surface 7B of the recess 7H of the lower step 7 and the Y side surface of the nozzle member 70, and the lower step 7 Z interferometers 83 (83A to 83C) that measure the distance (relative position) between the ceiling surface 7C of the concave portion 7H and the upper surface of the nozzle member 70. The interferometers 81 to 83 and the control device CONT are connected, and the measurement results of the interferometers 81 to 83 are output to the control device CONT.
In the present embodiment, the nozzle position measuring device 80 includes a plurality (two) of X interferometers 81. Specifically, the nozzle position measuring device 80 includes two X interferometers 81A and 81B provided side by side in the Y-axis direction on the inner surface 7B on the + X side of the recess 7H of the lower stepped portion 7. Further, on the side surface on the + X side of the nozzle member 70, reflecting surfaces 84A and 84B are provided at positions facing the X interferometers 81A and 81B, respectively. The control device CONT can determine the position of the nozzle member 70 in the X-axis direction with respect to the lower stepped portion 7 based on the measurement result of at least one of the X interferometers 81A and 81B. Further, the control device CONT can determine the position of the nozzle member 70 in the θZ direction with respect to the lower step portion 7 based on the measurement results of the plurality of X interferometers 81A and 81B.
In the present embodiment, the nozzle position measuring device 80 includes one Y interferometer 82. Specifically, the nozzle position measuring device 80 includes a Y interferometer 82 </ b> A provided on the −Y side inner surface 7 </ b> B of the recess 7 </ b> H of the lower stepped portion 7. Further, on the side surface on the −Y side of the nozzle member 70, a reflecting surface 85A is provided at a position facing the Y interferometer 82A. The control device CONT can determine the position of the nozzle member 70 in the Y-axis direction with respect to the lower step portion 7 based on the measurement result of the Y interferometer 82A.
In the present embodiment, the nozzle position measuring device 80 includes a plurality (three) of Z interferometers 83. Specifically, the nozzle position measuring device 80 is provided for the Z interferometers 83A and 83B provided side by side in the X-axis direction on the ceiling surface 7C of the recess 7H of the lower stepped portion 7, and the Z interferometer 83B. And a Z interferometer 83C provided at a position aligned in the Y-axis direction. In addition, on the upper surface of the nozzle member 70, reflecting surfaces 86A, 86B, and 86C are provided at positions facing the Z interferometers 83A, 83B, and 83C, respectively. The control device CONT can determine the position of the nozzle member 70 in the Z-axis direction with respect to the lower step portion 7 based on at least one measurement result of the Z interferometers 83A, 83B, 83C. Further, the control device CONT can obtain the positions of the nozzle member 70 in the θX direction and the θY direction with respect to the lower step portion 7 based on the measurement results of at least any two of the plurality of Z interferometers 83A, 83B, 83C. it can.
As described above, the control device CONT is based on the measurement results of the plurality of interferometers 81 to 83, and the lower stage in the six-degree-of-freedom direction (X-axis, Y-axis, Z-axis, θX, θY, and θZ directions). The position of the nozzle member 70 relative to the portion 7 (main column 1) can be obtained.
The number and arrangement of the X interferometer 81, the Y interferometer 82, and the Z interferometer 83 can be arbitrarily set. For example, the Z interferometer 83 may be provided so as to measure the distance (relative position) between the lower surface of the flange portion 70T of the nozzle member 70 and the bottom surface 7A of the concave portion 7T of the lower step portion 7. Alternatively, one X interferometer 81 and two Y interferometers 82 may be provided. In short, what is necessary is just to be comprised so that the position regarding the direction of 6 degrees of freedom of the nozzle member 70 can be measured using several interferometers 81-83.
The nozzle position measuring device 80 is not limited to an interferometer, and a position measuring device having another configuration such as a capacitance sensor or an encoder can also be used.
Further, the exposure apparatus EX includes an acceleration measuring instrument 90 that measures acceleration information of the nozzle member 70. In the present embodiment, the acceleration measuring instrument 90 includes an X acceleration measuring instrument 91 (91A, 91B) that measures acceleration in the X-axis direction of the nozzle member 70 and a Y acceleration that measures acceleration in the Y-axis direction of the nozzle member 70. A measuring instrument 92 (92A) and a Z acceleration measuring instrument 93 (93A to 93C) that measures acceleration in the Z-axis direction of the nozzle member 70 are provided.
The acceleration measuring devices 91 to 93 and the control device CONT are connected to each other, and the measurement results of the acceleration measuring devices 91 to 93 are output to the control device CONT.
In the present embodiment, the acceleration measuring instrument 90 includes a plurality (two) of X acceleration measuring instruments 91. Specifically, the acceleration measuring instrument 90 includes two X acceleration measuring instruments 91A and 91B provided side by side in the Y-axis direction on the side surface on the + X side of the nozzle member 70. The control device CONT can obtain the acceleration of the nozzle member 70 in the X-axis direction based on the measurement result of at least one of the X acceleration measuring devices 91A and 91B. Further, the control device CONT can obtain the acceleration in the θZ direction of the nozzle member 70 based on the measurement results of the plurality of X acceleration measuring devices 91A and 91B.
In the present embodiment, the acceleration measuring instrument 90 includes one Y acceleration measuring instrument 92. Specifically, the acceleration measuring instrument 90 includes a Y acceleration measuring instrument 92 </ b> A provided on the −Y side surface of the nozzle member 70. The control device CONT can obtain the acceleration of the nozzle member 70 in the Y-axis direction based on the measurement result of the Y acceleration measuring device 92A.
In the present embodiment, the acceleration measuring instrument 90 includes a plurality (three) of Z acceleration measuring instruments 93. Specifically, the acceleration measuring instrument 90 includes Z acceleration measuring instruments 93A and 93B provided side by side in the X-axis direction on the upper surface of the nozzle member 70, and positions aligned in the Y-axis direction with respect to the Z acceleration measuring instrument 93B. And a Z acceleration measuring instrument 93C provided in the apparatus. The control device CONT can obtain the acceleration of the nozzle member 70 in the Z-axis direction based on at least one measurement result of the Z acceleration measuring devices 93A, 93B, and 93C. Further, the control device CONT can determine the acceleration of the nozzle member 70 in the θX direction and the θY direction based on at least any two measurement results of the plurality of Z acceleration measuring devices 93A, 93B, 93C.
As described above, the control device CONT is based on the measurement results of the plurality of acceleration measuring devices 91 to 93, and is a nozzle member related to directions of six degrees of freedom (X-axis, Y-axis, Z-axis, θX, θY, and θZ directions). An acceleration of 70 can be determined.
The number and arrangement of the X acceleration measuring device 91, the Y acceleration measuring device 92, and the Z acceleration measuring device 93 can be arbitrarily set. For example, the Z acceleration measuring device 93 may be provided on the lower surface of the collar portion 70T of the nozzle member 70. Alternatively, one X acceleration measuring instrument 91 and two Y acceleration measuring instruments 92 may be provided. In short, what is necessary is just to be comprised so that the acceleration regarding the direction of 6 degrees of freedom of the nozzle member 70 can be measured using the some acceleration measuring devices 91-93.
In parallel with the supply of the liquid LQ onto the substrate P by the liquid supply mechanism 10, the control device CONT performs the recovery of the liquid LQ on the substrate P by the liquid recovery mechanism 20, and the substrate stage PST that supports the substrate P X While moving in the axial direction (scanning direction), the pattern image of the mask M is projected and exposed onto the substrate P via the liquid LQ between the projection optical system PL and the substrate P and the projection optical system PL.
The liquid LQ supplied from the liquid supply unit 11 of the liquid supply mechanism 10 to form the liquid immersion area AR2 is formed inside the nozzle member 70 after flowing through the supply pipes 13A and 13B and the tube members 16A and 16B. Then, the liquid is supplied onto the substrate P from the liquid supply ports 12A and 12B via the supply channels 14A and 14B. The liquid LQ supplied onto the substrate P from the liquid supply ports 12A and 12B is supplied so as to spread between the lower end surface of the front end portion (optical element 2) of the projection optical system PL and the substrate P, and the projection area AR1. A liquid immersion area AR2 smaller than the substrate P and larger than the projection area AR1 is locally formed on a part of the substrate P including At this time, the control device CONT uses the liquid supply ports 12A and 12B arranged on both sides of the projection area AR1 in the X-axis direction (scanning direction) of the liquid supply mechanism 10 from both sides of the projection area AR1 with respect to the scanning direction. The liquid LQ is supplied onto P at the same time. Thereby, the immersion area AR2 is formed uniformly and satisfactorily.
The liquid LQ on the substrate P is recovered from the liquid recovery ports 22A and 22B of the nozzle member 70, and then recovered through the recovery flow paths 24A and 24B, the tube members 26A and 26B, and the recovery tubes 23A and 23B. Collected by the unit 21. At this time, the controller CONT can control the liquid recovery amount per unit time by the liquid recovery unit 21, and the liquid LQ of the substrate P is recovered by a predetermined amount per unit time.
The exposure apparatus EX in the present embodiment projects and exposes a pattern image of the mask M onto the substrate P while moving the mask M and the substrate P in the X-axis direction (scanning direction). A pattern image of a part of the mask M is projected into the projection area AR1 via the liquid LQ in the area AR2 and the projection optical system PL, and is synchronized with the movement of the mask M in the −X direction (or + X direction) at the velocity V. Then, the substrate P moves in the + X direction (or −X direction) with respect to the projection area AR1 at the speed β · V (β is the projection magnification). A plurality of shot areas are set on the substrate P, and after the exposure to one shot area is completed, the next shot area is moved to the scanning start position by the stepping movement of the substrate P. Hereinafter, step-and-scan Scanning exposure processing is sequentially performed on each shot area while moving the substrate P by the method.
By supplying and collecting the liquid LQ, the nozzle member 70 may vibrate. Further, the vibration component generated on the substrate P side due to the movement in the XY direction of the substrate stage PST for scanning exposure and the movement in the Z-axis direction and the tilt direction (θX, θY direction) for focus / leveling adjustment is a liquid component. In some cases, the liquid is transmitted to the nozzle member 70 via the liquid LQ in the immersion area AR2. Further, when the substrate P is scanned, the nozzle member 70 may be moved by the viscous resistance of the liquid LQ in the liquid immersion area AR2. That is, the liquid LQ in the liquid immersion area AR2 may exert a force on the nozzle member 70.
Since the lower step 7 (main column 1) that supports the nozzle member 70 also supports the projection optical system PL, the vibration generated in the nozzle member 70 may be transmitted to the projection optical system PL. When the vibration generated in the nozzle member 70 is transmitted to the projection optical system PL, the pattern image projected onto the substrate P via the projection optical system PL and the liquid LQ deteriorates. Therefore, the control device CONT uses the image stabilization mechanism 60 to perform image stabilization so that the vibration of the nozzle member 70 is not transmitted to the projection optical system PL.
When the nozzle member 70 vibrates, the position of the nozzle member 70 with respect to the lower step portion 7 of the main column 1 fluctuates. Therefore, the control device CONT determines the vibration isolating mechanism 60 based on the measurement result of the nozzle position measuring device 80. The driving devices 61 to 63 are driven. The position of the nozzle member 70 with respect to the lower step 7 is measured by a nozzle position measuring device 80. The control device CONT maintains the position of the nozzle member 70 with respect to the lower step portion 7 in a desired state based on the measurement result of the nozzle position measuring device 80, that is, the lower step portion 7 and the nozzle member 70 The driving devices 61 to 63 of the vibration isolation mechanism 60 are driven so as to keep the positional relationship constant.
At this time, the control device CONT performs arithmetic processing based on the measurement results of the X, Y, and Z position measuring devices 81, 82, and 83, and the direction of six degrees of freedom of the nozzle member 70 relative to the lower step portion 7 (X Each position information regarding the axis, Y axis, Z axis, θX, θY, and θZ directions) is obtained. The control device CONT drives each of the X, Y, and Z driving devices 61, 62, and 63 based on the obtained positional information on the direction of 6 degrees of freedom, thereby causing the nozzle member 70 to move relative to the lower step portion 7. Control each position in the direction of 6 degrees of freedom (X-axis, Y-axis, Z-axis, θX, θY, and θZ directions).
Further, since the nozzle member 70 is supported by a passive vibration isolation mechanism 72 including an air spring, the high frequency component of vibration that is transmitted from the nozzle member 70 side to the lower step portion 7 by the elastic action of the gas of the air spring. Can be reduced. The vibration isolation mechanism 60 obtains a vibration isolation effect in a wide frequency band by reducing a relatively low frequency component (for example, 1 Hz to 10 Hz) of vibration by the active vibration isolation mechanism 65 including the driving devices 61 to 63. be able to. As described above, the active vibration isolation (active vibration isolation) using the driving devices 61 to 63 and the passive vibration isolation (passive vibration isolation) using the elastic action of gas act on the nozzle member 70. It is possible to effectively suppress the transmitted vibration from being transmitted to the projection optical system PL via the lower step 7. Further, among the vibration components of the nozzle member 70, a very low frequency component (for example, a frequency component of 1 Hz or less) is considered to have little influence on the accuracy of pattern transfer onto the substrate P. It is also possible to construct a control system for the vibration isolation mechanism 60 so as not to perform. By doing so, inconveniences such as oscillation of the control system can be prevented, and the control system can be constructed with a relatively simple configuration.
As described above, the vibration control mechanism 60 can prevent vibration generated in the nozzle member 70 from being transmitted to the projection optical system PL via the lower step 7 (main column 1). Therefore, it is possible to prevent deterioration of the pattern image projected onto the substrate P via the projection optical system PL and the liquid LQ.
In the present embodiment, the supply pipes 13A and 13B and the supply flow paths 14A and 14B of the nozzle member 70 are connected via tube members 16A and 16B that are extendable and flexible. Similarly, the recovery pipes 23A and 23B and the recovery flow paths 24A and 24B of the nozzle member are connected to each other via tube members 26A and 26B that are extendable and flexible. Therefore, even when the nozzle member 70 is driven using the driving devices 61 to 63, the driving of the nozzle member 70 is not hindered. Therefore, the vibration isolating mechanism 60 can support the nozzle member 70 with respect to the lower step portion 7 with good vibration isolation.
In addition, a configuration in which a reference mirror (fixed mirror) of an interferometer system for measuring position information of the substrate stage PST is attached to the lens barrel PK of the projection optical system PL is considered, but vibration is not transmitted to the projection optical system PL. By doing so, even if the reference mirror (fixed mirror) of the interferometer system for measuring the position information of the substrate stage PST is attached to the barrel PK, the measurement of the position information of the substrate stage PST and the measurement thereof are performed. Position control based on the result can be performed with high accuracy.
Further, as described above, there is a possibility that the liquid LQ in the liquid immersion area AR2 exerts a force on the nozzle member 70, and the position of the nozzle member 70 fluctuates due to the force, and the substrate P, the projection area AR1, or the liquid immersion area. There is also a possibility that the liquid LQ may be supplied and recovered in a state where the nozzle member 70 is not disposed at an optimal position with respect to AR2. In that case, the control device CONT uses the drive devices 61 to 63 of the vibration isolation mechanism 60 to adjust the positional relationship between the lower stepped portion 7 (main column 1) and the nozzle member 70, thereby controlling the nozzle member 70. It is possible to supply and recover the liquid LQ for forming the liquid immersion area AR2 in a state where the liquid immersion area AR2 is disposed at the optimal position. Therefore, it is possible to form the immersion area AR2 well and perform the immersion exposure with high accuracy.
Further, the control device CONT can adjust the position of the nozzle member 70 using the driving devices 61 to 63. Therefore, for example, after the immersion exposure of the substrate P is completed, the nozzle member 70 is moved in the −Z direction (downward) to recover the liquid LQ on the substrate P (on the substrate stage PST). It is also possible to perform liquid recovery in a state where the recovery port 22 and the substrate P are close to each other.
Alternatively, the substrate P and the nozzle member 70 including the distance between the surface of the substrate P and the lower surface 70A of the nozzle member 70 according to the immersion exposure conditions (scanning speed of the substrate P, physical properties (viscosity) of the liquid LQ, etc.). It is also possible to adjust the positional relationship using the driving devices 61 to 63 and perform immersion exposure. When the nozzle member 70 is not used, the nozzle member 70 is moved in the + Z direction (upward direction) to prevent contact between the nozzle member 70 and the substrate P or between the nozzle member 70 and the substrate stage PST. May be.
In the above-described embodiment, the control device CONT is based on the measurement result of the nozzle position measuring device 80 so that the vibration of the nozzle member 70 is not transmitted to the projection optical system PL via the lower step portion 7. Although the driving devices 61 to 63 are driven, the driving devices 61 to 63 may be driven based on the measurement result of the acceleration measuring instrument 90. At this time, the control device CONT performs arithmetic processing based on the measurement results of the X, Y, and Z acceleration measuring instruments 91, 92, and 93, and the direction of the six degrees of freedom of the nozzle member 70 (X axis, Y axis, Z axis). Each acceleration information regarding the axis, θX, θY, and θZ directions) is obtained. The control device CONT drives each of the X, Y, and Z driving devices 61, 62, and 63 based on the acceleration information relating to the obtained 6-degree-of-freedom direction, so that the 6-degree-of-freedom direction ( X-axis, Y-axis, Z-axis, θX, θY, and θZ directions) are suppressed.
The control device CONT may drive the driving devices 61 to 63 in consideration of both the measurement result of the nozzle position measuring device 80 and the measurement result of the acceleration measuring device 90.
Further, the anti-vibration mechanism 60 can be configured by only the passive anti-vibration mechanism 72 without providing the active anti-vibration mechanism 65, and the active anti-vibration mechanism 65 without providing the passive anti-vibration mechanism 72. It is also possible to configure only by this.
In the above-described embodiment, the nozzle member 70 has both the liquid supply port 12 and the liquid recovery port 22, but has a nozzle member (supply nozzle) having the liquid supply port 12 and the liquid recovery port 22. The nozzle member (collection nozzle) may be provided separately. In that case, the vibration isolation mechanism (adjustment mechanism) 60 may be provided in both the supply nozzle and the recovery nozzle, or may be provided in either one.
In the above-described embodiment, the position control of the nozzle member 70 (active vibration isolation control for the lower stepped portion 7) is feedback control performed based on the position measurement result of the nozzle member 70 by the position measuring device 80. In that case, there is a possibility that a delay occurs in the control. Therefore, before exposure, a physical quantity related to the behavior of the exposure apparatus EX and the liquid LQ at the time of scanning exposure is obtained in advance, and based on the obtained physical quantity, the driving devices 61 to 63 are driven at the time of exposure to control the attitude of the nozzle member 70. It is also possible to use active vibration isolation by adopting feedforward control that performs the above. It is also possible to combine feedback control and feedforward control.
When feedforward control is performed, test exposure is performed in advance to derive a plurality of physical quantities. That is, an identification experiment of the system of the exposure apparatus EX is performed, and dynamic characteristics including the physical quantity of the system are obtained. In the identification experiment, the liquid LQ is supplied and recovered through the liquid supply port 12 and the liquid recovery port 22 of the nozzle member 70 by the liquid supply mechanism 10 and the liquid recovery mechanism 20, and the optical element 2, the nozzle member 70, the substrate P, and the like. The substrate stage PST is scanned with the liquid immersion area AR2 formed between them, and the physical quantity is detected using the nozzle position measuring device 80. Note that the drive devices 61 to 63 are not driven during the identification experiment. As physical quantities to be detected, the time in the exposure sequence, the position, speed and acceleration of the substrate P, the position, speed and acceleration of the nozzle member 70, the relative position of the nozzle member 70 and the substrate P, the relative speed, and the relative Examples include acceleration. As for the position, velocity, and acceleration, values related to all (6 degrees of freedom) in the X-axis, Y-axis, Z-axis, θX, θY, and θZ directions are detected. Furthermore, examples of the physical quantity to be detected include the amount (volume, mass) of the liquid LQ to be supplied and physical properties (viscosity, etc.). The plurality of physical quantities detected in the identification experiment are stored in the control device CONT. The control device CONT determines a control amount for driving the drive devices 61 to 63 based on the detected physical quantity, and performs a vibration isolation for the lower step portion 7 based on the determined physical quantity. The main exposure is performed while driving 61-63. In this way, the control device CONT can perform vibration isolation according to the dynamic characteristics (operation) of the exposure apparatus EX itself by using the driving devices 61 to 63, and the lower step portion 7, the nozzle member 70, and the like. Can be maintained in a desired state.
FIG. 4 is a diagram showing another embodiment of the present invention. In FIG. 4, the exposure apparatus EX includes a nozzle position measuring device 100 that measures the positional relationship between the projection optical system PL supported by the lower step portion 7 of the main column 1 and the nozzle member 70. The nozzle position measuring device 100 includes an X interferometer 101 (101A, 101B) that measures a positional relationship between the projection optical system PL and the nozzle member 70 in the X-axis direction, and a Y-axis direction between the projection optical system PL and the nozzle member 70. A Y interferometer 102 (not shown in FIG. 4) that measures the positional relationship with respect to the Z axis direction between the projection optical system PL and the nozzle member 70 is measured (103A to 103A). 103C (however, 103C is not shown in FIG. 4). Each of these interferometers 101 to 103 is attached to a lens barrel PK of the projection optical system PL. The interferometers 101 to 103 and the control device CONT are connected, and the measurement results of the interferometers 101 to 103 are output to the control device CONT.
Based on the measurement results of the plurality of interferometers 101 to 103, the control device CONT is a projection optical system PL (lens barrel) related to directions with six degrees of freedom (X-axis, Y-axis, Z-axis, θX, θY, and θZ directions). The position of the nozzle member 70 with respect to (PK) can be obtained. Based on the obtained position information, the control device CONT drives the driving devices 61 to 63 so that the vibration of the nozzle member 70 is not transmitted to the projection optical system PL. Alternatively, the control device CONT drives the driving devices 61 to 63 based on the obtained position information to adjust the positional relationship between the projection optical system PL and the nozzle member 70.
FIG. 5 is a diagram showing another embodiment of the present invention. In FIG. 5, the exposure apparatus EX includes a nozzle position measuring device 110 that measures the positional relationship between the substrate stage PST and the nozzle member 70. The nozzle position measuring device 110 is an X interferometer 111 (111A, 111B) that measures the positional relationship between the substrate stage PST and the nozzle member 70 in the X-axis direction, and the position between the substrate stage PST and the nozzle member 70 in the Y-axis direction. A Y interferometer 112 (not shown in FIG. 5) that measures the relationship, and a Z interferometer 113 (113A to 113C, which measures the positional relationship between the substrate stage PST and the nozzle member 70 in the Z-axis direction. 113C is not shown in FIG. Each of these interferometers 111 to 113 is attached to a predetermined position on the substrate stage PST that does not interfere with the exposure process. In FIG. 5, each interferometer 111-113 is attached to the side surface of the substrate stage PST. The interferometers 111 to 113 are connected to the control device CONT, and the measurement results of the interferometers 111 to 113 are output to the control device CONT.
Based on the measurement results of the plurality of interferometers 111 to 103, the control device CONT has a nozzle member 70 for the substrate stage PST with respect to directions with six degrees of freedom (X-axis, Y-axis, Z-axis, θX, θY, and θZ directions). Can be determined. The control device CONT drives the driving devices 61 to 63 based on the obtained position information to adjust the positional relationship between the substrate stage PST and the nozzle member 70.
As described above, when the liquid immersion method is used, the numerical aperture NA of the projection optical system may be 0.9 to 1.3. When the numerical aperture NA of the projection optical system becomes large in this way, the imaging performance may deteriorate due to the polarization effect with random polarized light conventionally used as exposure light. desirable. In that case, linearly polarized illumination is performed in accordance with the longitudinal direction of the line pattern of the mask (reticle) line-and-space pattern. From the mask (reticle) pattern, the S-polarized component (TE-polarized component), that is, the line pattern It is preferable that a large amount of diffracted light having a polarization direction component is emitted along the longitudinal direction. When the space between the projection optical system PL and the resist applied on the surface of the substrate P is filled with a liquid, the space between the projection optical system PL and the resist applied on the surface of the substrate P is filled with air (gas). Compared with the case where the transmittance of the diffracted light of the S-polarized component (TE-polarized component) contributing to the improvement of the contrast is high on the resist surface, the numerical aperture NA of the projection optical system exceeds 1.0. Even in this case, high imaging performance can be obtained. Further, it is more effective to appropriately combine a phase shift mask and an oblique incidence illumination method (particularly a dipole illumination method) or the like according to the longitudinal direction of the line pattern as disclosed in JP-A-6-188169. For example, when illuminating a halftone phase shift mask (pattern with a half pitch of about 45 nm) with a transmittance of 6% using both the linearly polarized illumination method and the dipole illumination method, a dipole is formed on the pupil plane of the illumination system. If the illumination σ defined by the circumscribed circle of the two luminous fluxes is 0.95, the radius of each luminous flux on the pupil plane is 0.125σ, and the numerical aperture of the projection optical system PL is NA = 1.2, the randomly polarized light is The depth of focus (DOF) can be increased by about 150 nm rather than using it.
Furthermore, not only linearly polarized illumination (S-polarized illumination) matched to the longitudinal direction of the line pattern of the mask (reticle) but also a circle centered on the optical axis as disclosed in JP-A-6-53120. A combination of the polarization illumination method that linearly polarizes in the tangential (circumferential) direction and the oblique incidence illumination method is also effective. In particular, when a mask (reticle) pattern includes not only a line pattern extending in a predetermined direction but also a plurality of line patterns extending in different directions, the same is disclosed in Japanese Patent Laid-Open No. 6-53120. In addition, by using the polarization illumination method that linearly polarizes in the tangential direction of the circle centered on the optical axis and the annular illumination method, high imaging performance can be obtained even when the numerical aperture NA of the projection optical system is large. it can. For example, a polarized illumination method and an annular illumination method (annular ratio) in which a half-tone phase shift mask having a transmittance of 6% (a pattern having a half pitch of about 63 nm) is linearly polarized in a tangential direction of a circle around the optical axis. 3/4), when the illumination σ is 0.95 and the numerical aperture of the projection optical system PL is NA = 1.00, the depth of focus (DOF) is more than that of using randomly polarized light. If the projection optical system has a numerical aperture NA = 1.2 with a pattern with a half pitch of about 55 nm, the depth of focus can be increased by about 100 nm.
The present invention includes, for example, JP-A-10-163099, JP-A-10-214783 and the corresponding US Pat. No. 6,400,441, JP 2000-505958A and the corresponding US. The present invention can also be applied to a twin stage type exposure apparatus described in Japanese Patent No. 5,969,441 and US Pat. No. 6,262,796. To the extent permitted by national legislation of the designated country (or selected selected country) designated in this international application, the disclosure in the above publication or US patent is incorporated herein by reference.
In addition, as disclosed in JP-A-11-135400, the present invention includes an exposure stage that can move while holding a substrate to be processed such as a wafer, and a measurement stage that includes various measurement members and sensors. The present invention can also be applied to a provided exposure apparatus. To the extent permitted by national legislation of the designated country (or selected selected country) designated in this international application, the disclosures in the above publications and corresponding US patents are incorporated herein by reference.
In the above-described embodiment, the exposure apparatus that locally fills the liquid between the projection optical system PL and the substrate P is adopted. However, the stage holding the exposure target substrate is moved in the liquid tank. The present invention can also be applied to an immersion exposure apparatus or an immersion exposure apparatus in which a liquid tank having a predetermined depth is formed on a stage and a substrate is held therein. For the structure and exposure operation of an immersion exposure apparatus that moves a stage holding a substrate to be exposed in a liquid tank, for example, in Japanese Patent Laid-Open No. 6-124873, a liquid tank having a predetermined depth is formed on the stage An immersion exposure apparatus for holding a substrate therein is disclosed in, for example, Japanese Patent Laid-Open No. 10-303114 and US Pat. No. 5,825,043. To the extent permitted by national legislation in the designated country (or selected selected country) designated in this international application, the disclosure in the above publication or US patent is incorporated herein by reference.
When using a linear motor (see USP5,623,853 or USP5,528,118) for the substrate stage PST and mask stage MST, use either the air levitation type using air bearings or the magnetic levitation type using Lorentz force or reactance force. Also good. Each stage PST, MST may be a type that moves along a guide, or may be a guideless type that does not have a guide. To the extent permitted by national legislation in the designated country (or selected selected country) designated in this international application, the disclosure in the above US patent is incorporated herein by reference.
A frame as described in JP-A-8-166475 and the corresponding US Pat. No. 5,528,118 so that the reaction force generated by the movement of the substrate stage PST is not transmitted to the projection optical system PL. You may make it escape to a floor (ground) mechanically using a member. To the extent permitted by national legislation in the designated country (or selected selected country) designated in this international application, the disclosure in the above publication or US patent is incorporated herein by reference.
Further, the reaction force generated by the movement of the mask stage MST is described in JP-A-8-330224 and the corresponding US Pat. No. 5,874,820 so as not to be transmitted to the projection optical system PL. A mechanical frame member may be used to mechanically escape to the floor (ground). To the extent permitted by national legislation in the designated country (or selected selected country) designated in this international application, the disclosure in the above publication or US patent is incorporated herein by reference.
As shown in FIG. 6, a microdevice such as a semiconductor device includes a step 201 for designing a function / performance of the microdevice, a step 202 for manufacturing a mask (reticle) based on the design step, and a substrate as a base material of the device. Manufacturing step 203, substrate processing step 204 for exposing the mask pattern onto the substrate by the exposure apparatus EX of the above-described embodiment, device assembly step (including dicing process, bonding process, packaging process) 205, inspection step 206, etc. It is manufactured after.
DESCRIPTION OF SYMBOLS 1 ... Main column (support member), 2 ... Optical element, 7 ... Lower step part (support member), 12 ... Liquid supply port, 22 ... Liquid recovery port, 60 ... Anti-vibration mechanism (adjustment mechanism), 61-63 DESCRIPTION OF SYMBOLS ... Drive device, 65 ... Active anti-vibration mechanism, 70 ... Nozzle member, 72 ... Passive anti-vibration mechanism, 80, 100, 110 ... Position measuring device, 90 ... Acceleration measuring device, AR1 ... Projection area, AR2 ... Immersion area, EX ... exposure apparatus, LQ ... liquid, P ... substrate, PL ... projection optical system, PST ... substrate stage
In an exposure apparatus that exposes a substrate through a liquid in an optical system and an immersion area,
A nozzle member having a lower surface to which the substrate can face;
A supply port that is disposed in the nozzle member so that the surfaces of the substrate face each other, and supplies a liquid to form the liquid immersion region;
A recovery port that is disposed in the nozzle member such that the surface of the substrate is opposed, and recovers the liquid supplied from the supply port;
A drive device for driving the nozzle member,
By the driving device, the nozzle member is movable in the direction of 6 degrees of freedom,
The recovery port is provided so as to surround the supply port,
An exposure apparatus that forms the liquid immersion region in a part of the substrate by performing liquid recovery from the recovery port while supplying liquid from the supply port.
The exposure apparatus according to claim 1, wherein the nozzle member is rotatable about an axis perpendicular to an optical axis of the optical system by the driving device.
By the driving device, the nozzle member is rotatable around an axis perpendicular to the optical axis of the optical system,
The exposure apparatus according to claim 1, wherein the nozzle member is rotatable around the optical axis of the optical system by the driving device.
By the driving device, the nozzle member is rotatable around the optical axis of the optical system,
The exposure apparatus according to claim 1, wherein the nozzle member is movable in a direction perpendicular to an optical axis of the optical system by the driving device.
The nozzle member has a lower surface facing the surface of the substrate,
Exposure apparatus according to any one of claims 1-6, wherein the supply port and said recovery port is provided on the lower surface of the nozzle member.
By the driving device, the nozzle member is movable in a direction perpendicular to the optical axis of the optical system,
The supply port and the recovery port are provided on the lower surface of the nozzle member facing the surface of the substrate,
The exposure apparatus according to claim 7 or 8 , wherein the driving device adjusts a distance between the substrate and the lower surface of the nozzle member in immersion exposure of the substrate.
The exposure apparatus according to any one of claims 1 to 9 , wherein the nozzle member is movable in a direction parallel to an optical axis direction of the optical system by the driving device.
The substrate is exposed while being moved in the scanning direction,
The exposure apparatus according to any one of claims 1 to 10 , wherein the supply port is provided at each position on both sides of the scanning direction across the projection area of the optical system.
The exposure apparatus according to claim 11 , wherein the supply port has a slit shape that is long in a direction intersecting the scanning direction.
The recovery port An exposure apparatus according to claim 11 or 12, which is a long slit shape in a direction intersecting the scanning direction.
The exposure apparatus according to any one of claims 1 to 13 , wherein the recovery port is provided so as to surround the supply port and a projection region of the optical system.
And the lower surface of the nozzle member, wherein the lower surface of the optical element of the image plane tip of the optical system, an exposure apparatus according to any one of claims 1 to 14 which is substantially flush.
The exposure apparatus according to claim 1, wherein the lower surface of the nozzle member and the lower surface of the optical element are lyophilic.
The nozzle member is formed in an annular shape so as to surround the optical element at the image surface tip of the optical system,
The exposure apparatus according to claim 1, wherein the nozzle member is supported in a state separated from the optical system.
An acceleration measuring instrument for measuring acceleration information of the nozzle member;
The exposure apparatus according to claim 1, wherein the driving device drives the nozzle member based on a measurement result of the acceleration measuring instrument.
The exposure apparatus according to claim 18, wherein the acceleration measuring instrument is provided on the nozzle member.
The exposure apparatus according to claim 1, wherein the nozzle member is supported by a support member that supports the optical system.
A first position measuring device that measures a positional relationship between the nozzle member and a support member that supports the nozzle member;
The exposure apparatus according to claim 1, wherein the driving device drives the nozzle member based on a measurement result of the first position measuring device.
The exposure apparatus according to claim 21, wherein the driving device adjusts a positional relationship between the support member and the nozzle member.
23. The exposure apparatus according to claim 21, wherein the support member supports the optical system.
A second position measuring device for measuring a positional relationship between the optical system and the nozzle member;
The exposure apparatus according to any one of claims 1 to 23, wherein the driving device drives the nozzle member based on a measurement result of the second position measuring device.
The exposure apparatus according to claim 24, wherein the driving device adjusts a positional relationship between the optical system and the nozzle member.
A substrate stage for holding the substrate on a substrate holder;
A third position measuring device for measuring a positional relationship between the substrate stage and the nozzle member,
The exposure apparatus according to any one of claims 1 to 25, wherein the driving device drives the nozzle member based on a measurement result of the third position measuring device.
27. The exposure apparatus according to claim 26, wherein the driving device adjusts a positional relationship between the substrate stage and the nozzle member.
28. The exposure apparatus according to claim 26 or 27, wherein the substrate stage has an upper surface around the substrate held by the substrate holder so as to be substantially the same height as the surface of the substrate.
A position measuring device for acquiring position information of the nozzle member;
The exposure apparatus according to claim 1, wherein the driving device moves the nozzle member based on a measurement result of the position measuring device.
The exposure apparatus according to claim 1, further comprising a position measuring device for acquiring position information of the nozzle member.
The exposure apparatus according to claim 29 or 30, wherein the position measuring device measures the position of the nozzle member in a direction that coincides with an optical axis of the optical system.
The exposure apparatus according to any one of claims 29 to 31, wherein the position measuring device measures the position of the nozzle member with respect to a rotation direction around an axis perpendicular to the optical axis of the optical system.
The exposure apparatus according to any one of claims 29 to 32, wherein the position measuring device measures the position of the nozzle member in a direction perpendicular to the optical axis of the optical system.
34. The exposure apparatus according to any one of claims 29 to 33, wherein the position measuring device measures a position of the nozzle member in a rotation direction around an optical axis of the optical system.
35. The substrate stage according to any one of claims 1 to 25 and 29 to 34, wherein the substrate stage has an upper surface around the substrate held by the substrate holder so as to be substantially the same height as the surface of the substrate. Exposure equipment.
36. The exposure apparatus according to any one of claims 1 to 35, wherein the driving device includes a motor that is driven by a Lorentz force.
The exposure apparatus according to any one of claims 1 to 36, further comprising a temperature adjustment system that adjusts a temperature of the drive device.
A tube member that can be expanded and contracted and has flexibility;
The nozzle member has a supply channel corresponding to the supply port,
38. The exposure apparatus according to any one of claims 1 to 37, wherein one end of the supply channel is connected to the tube member, and the other end of the supply channel is connected to the supply port.
The nozzle member has a recovery channel corresponding to the recovery port,
The exposure apparatus according to any one of claims 1 to 38, wherein one end portion of the recovery channel is connected to the tube member, and the other end portion of the recovery channel is connected to the recovery port.
The exposure apparatus according to any one of claims 1 to 39, further comprising a gas-liquid separator that separates the liquid and gas recovered from the recovery port.
41. The exposure apparatus according to claim 1, wherein the nozzle member is formed of at least one of aluminum, titanium, stainless steel, duralumin, and an alloy including these.
The exposure apparatus according to any one of claims 1 to 41, wherein after the immersion exposure of the substrate, the drive device brings the recovery port of the nozzle member closer to the substrate and recovers the liquid from the recovery port. .
43. A device manufacturing method including a lithography process, wherein the exposure apparatus according to any one of claims 1 to 42 is used in the lithography process.
In an exposure method of exposing a substrate through liquid in an immersion area,
A liquid is supplied to the substrate from a supply port provided in the nozzle member so as to face the substrate, and a recovery is provided in the nozzle member so as to face the substrate and surround the supply port. Forming a liquid immersion region in a part on the substrate by recovering the liquid on the substrate from the mouth;
Measuring the position of the nozzle member;
Based on the measurement result, adjusting the position of the nozzle member in the rotational direction around an axis perpendicular to the optical axis of the optical system;
Exposing the substrate through a liquid that forms the immersion region.
Adjusting the position of the nozzle member in the rotational direction around the optical axis of the optical system based on the measurement result;
Adjusting the position of the nozzle member in a direction perpendicular to the optical axis of the optical system based on the measurement result;
Look including the a method comprising exposing the substrate through the liquid forming the liquid immersion area,
An exposure method in which the supply port and the recovery port are provided on the lower surface of the nozzle member facing the surface of the substrate .
47. The exposure method according to any one of claims 44 to 46, wherein a position of the nozzle member in a direction parallel to an optical axis direction of the optical system is adjusted based on the measurement result.
48. The exposure method according to any one of claims 44 to 47, wherein the position measurement of the nozzle member includes measurement of a positional relationship between a support member that supports the nozzle member and the nozzle member.
49. The exposure method according to any one of claims 44 to 48, wherein the position measurement of the nozzle member includes measurement of a positional relationship between the optical system and the nozzle member.
50. The exposure method according to any one of claims 44 to 49, wherein the position measurement of the nozzle member includes measurement of a positional relationship between a substrate stage that holds the substrate and the nozzle member.
A device manufacturing method including a lithography process, wherein the exposure method according to any one of claims 44 to 50 is used in the lithography process.
JP2010087336A 2004-03-25 2010-04-05 Exposure apparatus, exposure method, and device manufacturing method Active JP5310632B2 (en)
JP2010087336A JP5310632B2 (en) 2004-03-25 2010-04-05 Exposure apparatus, exposure method, and device manufacturing method
JP2006511475 Division 2005-03-23
JP2010153931A JP2010153931A (en) 2010-07-08
JP2010153931A5 JP2010153931A5 (en) 2011-08-11
JP5310632B2 true JP5310632B2 (en) 2013-10-09
JP2014018562A Active JP5790803B2 (en) 2004-03-25 2014-02-03 Exposure apparatus, exposure method, and device manufacturing method
JP2015005854A Active JP5971358B2 (en) 2004-03-25 2015-01-15 Exposure apparatus, exposure method, and device manufacturing method
JP2016192923A Active JP6315052B2 (en) 2004-03-25 2016-09-30 Exposure apparatus, exposure method, and device manufacturing method
JP2016192922A Active JP6315051B2 (en) 2004-03-25 2016-09-30 Exposure apparatus, exposure method, and device manufacturing method
JP2016192920A Active JP6315050B2 (en) 2004-03-25 2016-09-30 Exposure apparatus, exposure method, and device manufacturing method
JP2016192921A Active JP6304335B2 (en) 2004-03-25 2016-09-30 Exposure apparatus, exposure method, and device manufacturing method
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JP2005522020A (en) 2002-02-06 2005-07-21 アクリオン・エルエルシー Capillary drying of substrate
2018-10-26 US US16/172,161 patent/US20190064678A1/en not_active Abandoned
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