Source: https://patents.google.com/patent/KR101004199B1/en
Timestamp: 2020-07-04 04:09:43
Document Index: 202619259

Matched Legal Cases: ['art 10', 'art 10', 'art 30', 'art 30', 'art 10', 'art 10', 'art 48', 'art 49', 'art 48', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 12', 'art 48', 'art 49', 'art 470']

KR101004199B1 - Film forming device - Google Patents
KR101004199B1
KR101004199B1 KR1020107011259A KR20107011259A KR101004199B1 KR 101004199 B1 KR101004199 B1 KR 101004199B1 KR 1020107011259 A KR1020107011259 A KR 1020107011259A KR 20107011259 A KR20107011259 A KR 20107011259A KR 101004199 B1 KR101004199 B1 KR 101004199B1
KR1020107011259A
KR20100065403A (en
다카시 가케가와
2001-02-09 Priority to JPJP-P-2001-034520 priority
2002-02-08 Application filed by 도쿄엘렉트론가부시키가이샤 filed Critical 도쿄엘렉트론가부시키가이샤
2010-06-16 Publication of KR20100065403A publication Critical patent/KR20100065403A/en
2010-12-24 Publication of KR101004199B1 publication Critical patent/KR101004199B1/en
239000010408 films Substances 0.000 title claims abstract description 64
239000007789 gases Substances 0.000 claims abstract description 203
238000004089 heat treatment Methods 0.000 claims description 26
239000011133 lead Substances 0.000 claims description 14
238000005121 nitriding Methods 0.000 description 4
The film forming apparatus of the present invention includes a processing container defining a chamber, a mounting table provided in the chamber, on which a substrate to be processed can be mounted, a showerhead provided opposite the mounting table, and having a plurality of gas discharge holes; And a gas supply mechanism for supplying a processing gas into the chamber via the shower head, and a shower head temperature control means for controlling the temperature of the shower head.
Film deposition apparatus {FILM FORMING DEVICE}
The present invention relates to a film forming apparatus for forming a predetermined thin film on a substrate to be processed by chemical vapor deposition (CVD).
In the semiconductor manufacturing process, a thin film is formed by depositing a metal such as Ti, Al, Cu, or a metal compound such as WSi, TiN, TiSi, or the like to fill holes between wirings formed in a semiconductor wafer as an object to be processed or as a barrier layer. Forming.
Conventionally, thin films of these metals and metal compounds have been formed by physical vapor deposition (PVD). However, in recent years, miniaturization and high integration of devices have been required, and design standards have become particularly strict. For this reason, sufficient characteristics are hard to be acquired by PVD with poor embeddability. Therefore, such a thin film is beginning to be formed by CVD which can be expected to form a higher quality film.
As a conventional CVD film-forming apparatus, the thing for Ti film-forming is demonstrated as an example. In the above CVD film deposition apparatus for Ti film formation, a semiconductor wafer mounting stage (or a mounting table) in which a heater is incorporated is disposed in a chamber having a heater. Above the stage, a processing gas discharge shower head is provided to face the stage. The chamber is heated to a predetermined temperature, and the chamber is at a predetermined vacuum degree. Then, while the semiconductor wafer mounted on the stage is heated to a predetermined temperature, from the showerhead, TiCl 4 , H 2 Process gases, such as this, are supplied. In addition, the showerhead is supplied with high frequency power, and such a gas is converted into plasma. Thus, the film forming process is performed.
However, semiconductor wafers have recently been enlarged to 300 mm. For this reason, the film forming apparatus also needs to be enlarged. In connection with it, the following problems are coming up.
The showerhead provided opposite the stage is heated by the radiant heat when the heater in the stage is heated up. However, when the apparatus is enlarged, the shower head is also enlarged and its heat capacity is increased. Therefore, a longer time is required until the temperature is stabilized at the time of temperature increase. That is, processing efficiency becomes poor. If the temperature of the showerhead, i.e., the temperature of the surface of the showerhead is unstable, processing is not performed. In addition, the conventional shower head has a high heat insulation structure in order to ensure temperature stability during processing. For this reason, when a showerhead becomes large, very long time is required also, for example, even when it temperature-falls to predetermined temperature at the time of cleaning. Cleaning at high temperature will damage the showerhead member.
In addition, during idling, in order to maintain the temperature of the showerhead at a predetermined temperature, it was necessary to set the stage temperature higher than at the time of processing. This will be described in detail. Conventionally, when a plasma process is performed, the temperature of a member in the chamber is increased by the plasma. In particular, since the showerhead surface has a large area exposed to the plasma opposite the wafer surface, the temperature tends to increase. However, when the film is formed after idling or cleaning, the film formation speed may be low when the first sheet of wafer is formed. This is considered to be because the temperature of the showerhead is low. That is, at the time of normal film-forming, it is thought that the temperature of about 500 degreeC will fall about 20 to 30 degreeC. In order to prevent this, it was necessary to set the stage temperature to the film formation temperature or more during idling and cleaning.
In addition, conventionally, during maintenance of the shower head, the upper lid including the shower head was opened at an angle of 90 degrees or less to separate the shower head. However, if the showerhead is made larger or larger due to the larger size of the film forming apparatus, it is difficult to perform the maintenance of the showerhead by such a conventional method.
This invention is made | formed in view of such a situation, can make a showerhead into desired temperature in a short time, and can provide the film-forming apparatus with high temperature stability of a showerhead, and can easily implement maintenance of a showerhead. It is an object to provide a film forming apparatus.
The present invention provides a processing container defining a chamber, a mounting table installed in the chamber, on which a substrate to be processed can be mounted, a shower head provided opposite the mounting table, and having a plurality of gas discharge holes, and the shower. And a gas supply mechanism for supplying a processing gas into the chamber via the head, and a showerhead temperature control means for controlling the temperature of the showerhead.
According to the present invention, since the temperature control means is provided in the showerhead, it is possible to actively control the showerhead to a desired temperature during heating of the showerhead. Therefore, even in a large apparatus, the shower head can be heated and lowered in a short time. In addition, by actively controlling the temperature of the showerhead, the temperature stability of the showerhead can be improved.
For example, in the case of a film forming apparatus of Ti, a film is formed on the shower head surface when a pre-coating is formed by a showerhead or the like before processing to a substrate or when a film is formed by a substrate. At this time, in order to form a stable film on the showerhead surface, it is necessary to volatilize TiCl x generated in the intermediate reaction. For this reason, the showerhead needs to be raised to 425 ° C or higher, particularly 500 ° C or higher. In the prior art, since it is unclear whether the showerhead needs to be heated for a long time or the showerhead is at a desired temperature, a stable film cannot be produced. However, by providing the temperature control means in the showerhead, the showerhead can be controlled to a desired temperature during film formation or precoating, and a stable film can be reliably formed in the showerhead. In this way, the first film formation can be performed stably.
Preferably, the processing vessel is configured to be capable of vacuum suction.
Also preferably, the film forming apparatus further includes heating means for heating the mounting table.
Also preferably, the showerhead has a chamber inner portion including a surface on which a gas discharge hole is shown, and an atmosphere side portion in contact with the atmosphere outside the chamber, and the showerhead temperature control means includes the atmosphere side portion. Installed in
In this case, the showerhead temperature control means can be treated as an atmospheric atmosphere.
Also preferably, the film forming apparatus further includes second heating means for heating the chamber.
Also preferably, the showerhead temperature control means includes a heating mechanism for heating the showerhead, a cooling mechanism for cooling the showerhead, a temperature detection mechanism for detecting the temperature of the showerhead, and a temperature detection mechanism. It has a controller which controls at least the said heating mechanism based on a detection result.
In this case, in either of the temperature rise and the temperature drop, it is possible to quickly bring the showerhead to the desired temperature.
Further, in this case, more preferably, the heating mechanism has an inner heater for heating the inner part of the showerhead, and an outer heater for heating the outer part of the showerhead, and the temperature detecting mechanism has a An inner temperature detector detects a temperature, and an outer temperature detector detects a temperature of the outer portion.
In this case, more preferably, the controller controls the inner heater so that the detected value of the inner temperature detector is a set temperature, and the difference between the detected value of the inner temperature detector and the detected value of the outer temperature detector is zero. The outer heater is controlled as much as possible.
In this case, since heat dissipation from the outer portion of the shower head can be suppressed, more accurate temperature control can be realized.
Also preferably, a heat insulating member is disposed on a surface of the shower head opposite to the chamber.
In this case, the heat dissipation from the showerhead during the treatment can be effectively suppressed.
Also preferably, the showerhead has a showerhead body and an annular support portion that is continuous above the outer circumference of the showerhead body, and the support portion has a rib structure.
In this case, since portions other than the rib structure of the support portion can be made thin, heat dissipation from the support portion can be reduced. Thereby, temperature controllability can be improved more.
In this case, More preferably, the heat insulating material is arrange | positioned inside the said support part above the said showerhead main body.
Also preferably, an annular filling member and a supporting member for supporting the filling member on the showerhead or the processing container are disposed between the showerhead and the processing container.
In this case, More preferably, an elastic member is interposed between the said filling member and the said support member. In this case, even when quartz, ceramics, etc. are used as a filling member, those damage can be prevented. In addition, the gap between the filling member and the supporting member can be equalized by the elastic member.
Also preferably, the film forming apparatus further includes plasma generating means for generating plasma of a processing gas in the chamber.
Also preferably, the film forming apparatus further includes an inversion mechanism for turning the shower head to the outside of the chamber and inverting it.
In this case, the showerhead is pivoted out of the chamber and inverted so that it can be discharged almost completely out of the chamber. This makes it possible to easily perform maintenance of the showerhead.
In addition, the present invention provides a processing container defining a chamber, a mounting table provided in the chamber, on which a substrate to be processed can be mounted, a shower head provided opposite the mounting table, and having a plurality of gas discharge holes; And a gas supply mechanism for supplying a processing gas into the chamber via the shower head, and an inversion mechanism for turning the shower head out of the chamber and inverting it.
According to the present invention, the showerhead is pivoted out of the chamber and reversed so that it can be almost completely discharged out of the chamber. This makes it possible to easily perform maintenance of the showerhead.
Preferably, an annular filling member and a supporting member for supporting the filling member to the showerhead or the processing container are disposed between the showerhead and the processing container.
More preferably, the support member is detachable to the outside in the state in which the shower head is inverted, and the filling member is detachable upward to the state in which the support member is separated to the outside.
According to the present invention, since the temperature control means is provided in the showerhead, it is possible to actively control the showerhead to a desired temperature during heating of the showerhead. Therefore, even in a large apparatus, the shower head can be heated and lowered in a short time. In addition, since the showerhead can be actively temperature-controlled, there is an effect that the temperature stability of the showerhead can be improved.
1 is a cross-sectional view showing a CVD film deposition apparatus according to an embodiment of the present invention;
2 is a plan view showing an upper portion of a showerhead of a CVD film deposition apparatus according to an embodiment of the present invention;
3 is an enlarged cross-sectional view showing a filler portion of the apparatus of FIG. 1;
4 is a schematic diagram showing a portion corresponding to a heating mechanism in the temperature control means of the apparatus of FIG. 1;
FIG. 5 is a diagram showing a preferred control mode in the case of heating control by the temperature control means of the apparatus of FIG. 1;
6 is a cross-sectional view showing a state in which the showerhead of the apparatus of FIG. 1 is inverted by an inversion mechanism;
7 is an enlarged view of the showerhead of the device of FIG. 1, FIG.
9 is a cross-sectional view taken along line BB of FIG.
10 is a plan view showing a bottom plate when a gas diffusion promoting pipe is installed;
FIG. 11 is a cross-sectional view of a stop plate mounted on a lower plate and a gas diffusion promoting pipe of FIG. 10; FIG.
It is a schematic diagram which shows the modification of the part corresponded to the heating mechanism of FIG.
13 is a view showing a modification of the control mode of FIG. 5;
14 is a cross-sectional view showing a CVD film deposition apparatus according to another embodiment of the present invention;
15 is a cross-sectional view illustrating a modification of the filler portion of FIG. 3.
Hereinafter, a CVD film forming apparatus for forming a Ti thin film according to an embodiment of the present invention will be specifically described.
1 is a cross-sectional view illustrating a CVD film forming apparatus for forming a Ti thin film according to an embodiment of the present invention, and FIG. 2 is a plan view illustrating an upper portion of a shower head of the CVD film forming apparatus of FIG. 1. This film-forming apparatus 1 has the substantially cylindrical or box-shaped chamber 2 comprised airtight. In the chamber 2, a stage 3 for horizontally mounting the semiconductor wafer W as an object to be processed is provided. In the center of the bottom part of the chamber 2, the stage holding member 7 which protrudes below is attached via a sealing ring. The cylindrical support member 4 joined to the bottom surface of the stage 3 is fixed to the stage holding member 7. The chamber 2 and the stage holding member 7 have a heating mechanism not shown. The chamber 2 and the stage holding member 7 are heated to a predetermined temperature by the electric power being supplied from a power source (not shown).
The outer edge of the stage 3 is provided with a ring 5 for stabilizing the generation of plasma. In addition, the heater 6 is incorporated in the stage 3. By supplying electric power from the power supply which is not shown in figure, this heater 6 heats the semiconductor wafer W which is a to-be-processed object mounted on the stage 3 to predetermined temperature.
In the upper part of the chamber 2, the shower head 10 is provided so as to face the stage 3. This showerhead 10 has a top plate 10a, a stop plate 10b and a bottom plate 10c. The planar shape of the showerhead 10 is circular.
The top plate 10a, together with the stop plate 10b and the bottom plate 10c, has a horizontal portion 10d constituting the showerhead body portion, and an annular support portion continuous over the outer circumference of the horizontal portion 10d ( 10e). The top plate 10a is concave shape as a whole. Inside this support part 10e, as shown to FIG. 1 and FIG. 2, the rib 10f is arrange | positioned at equal intervals toward the center of the showerhead 10. As shown to FIG. By forming the rib 10f, the strength against the thermal deformation of the support portion 10e and the support strength of the support portion 10e can be increased, and the thickness of the other portion of the support portion 10e can be reduced. Thereby, the heat dissipation from the shower head 10 can be suppressed.
Preferably, the rib 10f protrudes 5 mm or more, especially 10 mm or more toward the center. Also preferably, the width of the rib 10f is at least 2 mm, in particular at least 5 mm. Also preferably, the ribs 10f are provided at equal intervals.
Top plate 10a functions as a base member. Under the outer periphery of the horizontal part 10d of this upper plate 10a, the upper part of the outer periphery of the recessed interruption plate 10b formed annularly is screwed. Moreover, the upper surface of the lower plate 10c is screwed to the lower surface of the interruption plate 10b. A space 11a is hermetically formed between the lower surface of the horizontal portion 10d of the upper plate 10a and the upper surface of the stopping plate 10b having the concave portion. On the lower surface of the stopping plate 10b, a plurality of grooves are formed radially and evenly. The stop plate 10b and the bottom plate 10c are also hermetically joined, and a space 11b is formed between the plurality of grooves formed in the bottom surface of the stop plate 10b and the top surface of the bottom plate 10c. In the stopping plate 10b, a plurality of first gas passages 12a penetrating toward the lower plate 10c through a plurality of holes formed in the stopping plate 10b from the space 11a, and the space 11a. The second gas passage 12b is formed in communication with the space 11b without being communicated with each other. In the lower plate 10c, a plurality of first gas discharge holes 13a communicating with the first gas passage 12a and a plurality of second gas discharge holes 13b communicating with the space 11b are formed. .
Here, the inner diameter of the first gas passage 12a formed in the stopping plate 10b is, for example, 0.5 mm to 3 mm, preferably 1.0 mm to 2.0 mm. The inner diameter of the first gas discharge hole 13a formed in the lower plate has a two-stage structure, and the space 11a side is, for example,? 1.0 mm to? 3.5 mm, preferably? 1.2 mm. To? 2.3 mm, and the opening side of the lower surface is, for example,? 0.3 mm to? 1.0 mm, preferably? 0.5 mm to? 0.7 mm.
The first gas introduction pipe 14a and the second gas introduction pipe 14b are connected to the upper surface of the upper plate 10a. The first gas introduction pipe 14a communicates with the space 11a, and the second gas introduction pipe 14b communicates with the second gas passage 12b and the space 11b of the stop plate 10b. have. Therefore, the gas introduced from the first gas introduction pipe 14a is discharged from the first gas discharge hole 13a through the space 11a and the first gas passage 12a. On the other hand, the gas introduced from the second gas introduction pipe 14b is introduced into the space 11b through the second gas passage 12b and discharged from the second gas discharge hole 13b. That is, the showerhead 10 is a postmix type in which the gas supplied from the first gas introduction pipe 14a and the gas supplied from the second gas introduction pipe 14b are independently supplied into the chamber 2. It is. That is, the gas supplied from the first gas introduction pipe 14a and the gas supplied from the second gas introduction pipe 14b are separately supplied without being mixed in the shower head 10.
7 is an enlarged view of the showerhead 10 of FIG. 1. As shown in FIG. 1 and FIG. 7, the lower surface of the portion of the upper plate 10a surrounding the connection portion with the second gas introduction pipe 14b for introducing the second processing gas and the second of the stopping plate 10b. The sealing ring 10h can be interposed between the flanges 10g of the portion forming the gas passage 12b. Thereby, it can prevent more reliably that each gas supplied from the 1st gas introduction pipe 14a and the 2nd gas introduction pipe 14b mixes.
A cross-sectional view taken along the line A-A of FIG. 7 is shown in FIG. 8, and a cross-sectional view taken along the line B-B of FIG. In Figs. 7 and 8, reference numeral 101 is a bolt. The bolt 101 fastens the stop plate 10b and the bottom plate 10c. The arrow in FIG. 9 has shown the flow direction of the gas supplied from the 2nd gas path 12b into the space 11b.
As shown to FIG. 7 and FIG. 9, the slit 12c as a gas discharge port is formed in the left and right of the lower end of the 2nd gas passage 12b. The direction in which the slit 12c is formed is not right and left, but may be vertical or inclined. In addition, instead of the slit 12c, a discharge hole may be formed. The diameter of the discharge hole is preferably 1.0 mm to 3.0 mm, in particular 2.0 mm. The number of discharge holes is also arbitrary.
On the other hand, as shown in FIG. 1, the flange 14 is welded in common to the base end part of the 1st gas introduction pipe 14a and the 2nd gas introduction pipe 14b connected to the upper plate 10a. An insulating member 24 having a first gas passage 24a and a second gas passage 24b is connected to the flange 14. The other side of the insulating member 24 is connected with a gas introduction member 26 having a first gas passage 26a and a second gas passage 26b. The gas introduction member 26 is connected to the upper surface of the lead member 15. The lead member 15 and the chamber 2 have the 1st gas passage 15a, 2a and the 2nd gas passage 15b, 2b, respectively. The first gas passages 24a, 26a, 15a, 2a and the second gas passages 24b, 26b, 15b, 2b from the flange 14 to the chamber 2 communicate with each other in series. Sealing rings, such as an O ring, are interposed. In addition, the first gas pipe 25a is connected to the first gas passage 2a of the chamber 2, and the second gas pipe 25b is connected to the second gas passage 2b. The gas supply part 30 is connected to the base end part of gas piping 25a, 25b.
Gas supply unit 30 is a cleaning gas ClF 3 ClF 3 to supply gas Gas source 31, TiCl 4 as the deposition gas TiCl 4 gas source 32 for supplying gas, Ar gas source 33 for supplying Ar gas, which is a carrier gas, H 2 , which is a reducing gas H 2 to supply gas NH 3 used for nitriding the gas supply source 34 and the Ti film NH 3 to supply gas It has a gas supply source 35. ClF 3 Gas pipes 36, 37, and 38 are connected to the gas supply source 31, the TiCl 4 gas supply source 32, and the Ar gas supply source 33, respectively, and these gas pipes 36, 37, and 38 are connected to the second gas. It is connected to the piping 25b. In addition, H 2 Gas source 34 and NH 3 Gas piping 39 and 40 are respectively connected to the gas supply source 35, and these gas piping 39 and 40 are connected to the 1st gas piping 25a.
Thus, ClF 3 Each gas from the gas supply source 31, the TiCl 4 gas supply source 32, and the Ar gas supply source 33 passes through the gas pipe 25b and the second gas passages 2b, 15b, 26b, and 24b of the respective members. ) And the second gas introduction pipe 14b to reach the second gas passage 12b of the stopping plate 10b of the showerhead 10. Subsequently, it is introduced into the space 11b and discharged from the second gas discharge hole 13b of the lower plate 10c.
In addition, H 2 Gas source 34, NH 3 The gas from the gas supply source 35 passes through the first gas pipe 25a, passes through the first gas passages 2a, 15a, 26a, 24a and the gas introduction pipe 14a of each member, and the shower head. It is introduced into the space 11a of (10). Then, it passes through the 1st gas path 12a of the interruption plate 10b, and is discharged from the 1st gas discharge hole 13a of the lower plate 10c.
Therefore, in the film formation process, TiCl 4 gas and H 2 The gas is mixed after being discharged into the chamber without being mixed during the supply of the gas. Plasma is formed, a desired reaction occurs, and a Ti film is formed on the semiconductor wafer (W). In addition, the gas pipes 36, 37, 38, 39, and 40 from each gas supply source all have a pair of on-off valves 42 and 43 provided so as to sandwich the mass flow controller 41 and the mass flow controller 41. Is installed. Although not shown here, the gas supply part 30 is N 2. It has a gas supply source, other piping, an on-off valve, etc. For example, the gas supplied to the spaces 11a and 11b may be changed by changing the gas supply source connected to the first gas passage 26a and the second gas passage 26b formed in the gas introduction member 26. have.
A lid member 15 having an opening is mounted on the upper surface of the chamber 2. An annular insulating member 16 is attached to the inner circumferential portion of the lead member 15. And the support part 10e of the said upper plate 10a is supported through the insulating member 16. As shown in FIG. For keeping warm, the upper part thereof is covered by the annular insulating member 21. The insulating member 21 is supported by the lead member 15. The insulating member 16 has the effect of insulating between the showerhead 10 and the chamber 2, and the effect of heat insulation. In addition, sealing rings such as O rings are interposed between the chamber 2 and the lead member 15, between the lead member 15 and the insulating member 16, and between the insulating member 16 and the support portion 10e, respectively. . As a result, an airtight state is formed.
On the upper surface of the horizontal portion 10d of the upper plate 10a, the inner heater 17 is disposed so as to correspond to the entire surface of the semiconductor wafer W mounted on the stage 3. The inner heater 17 may be formed by sandwiching a thin plate-like heater material in a sandwich structure with a mica insulating plate, for example. For example, a sheath heater is fitted in the circular annular (donut-shaped) outer heater 18 so as to surround the outside of the inner heater 17 (FIG. 14, the same heater as the inner heater 17). Is shown as an external heater.] These heaters function as components of the showerhead temperature control means described later.
The space 19 is formed above the inner heater 17. The heat insulating member 20 is provided above the space 19. The heat insulating member 20 is, for example, Al 2 O 3 It may be a ceramic or resin material. The heat insulating member 20 has a cooling gas passage 20a and a discharge port 20b. The dry air supply pipe 61a for cooling the inner side is connected to the upper portion of the cooling gas passage 20a. Moreover, the dry air supply piping 61b for external cooling is arrange | positioned above the support part 10e of the upper plate 10a. The pipe 61b has a pipe portion 61c along the inner circumferential side of the insulating member 21, and a plurality of blowout holes for discharging dry air are formed equally downward in the pipe portion 61c. have. The discharged dry air is supplied to the gap between the insulating member 16 and the heat insulating material 20 and the periphery thereof to cool the outer heater and the periphery thereof.
In addition, the power supply rod 45 is connected to the upper surface of the upper plate 10a of the shower head 10. The high frequency power supply 47 is connected to the electric power supply rod 45 via the matching unit 46. The high frequency power is supplied from the high frequency power source 47 to the shower head 10. Thereby, a high frequency electric field is formed, the process gas supplied into the chamber 2 is made into plasma, and film-forming reaction is accelerated | stimulated.
Around the lower part of the showerhead 10, in particular, the sides of the top plate 10a, the stopping plate 10b and the bottom plate 10c, the lower surface of the insulating member 16, the lower surface of the lid member 15 and the chamber 2 An annular quartz filler (or a filling member) 48 is provided in order to prevent plasma from being formed in the space portion surrounded by the side wall. As shown in FIG. 3, the filler 48 has the recessed part 48a in the outer part. The convex part 49a of the several support member 49 screwed to the lead member 15 is fitted in this recessed part 48a, and the pillar 48 is supported. An elastic member 50 made of an elastic material such as fluorine rubber is interposed between the side surface of the concave portion 48a of the filler 48 and the side surface of the convex portion 49a of the support member 49. By the presence of the elastic member 50, centering of the showerhead 10 can be performed easily, and the attachment / detachment of the filler 48 can be simplified. In addition, damage to the filler 48 due to expansion and contraction by heat can be prevented. In addition, an elastic member 51 is interposed between the filler 48 and the lead member 15. This elastic member 51 also has a damage preventing function of the filler 48.
An exhaust pipe 52 is connected to the side wall of the bottom of the cylindrical stage holding member 7 attached to the bottom of the chamber 2. An exhaust device 53 is connected to the exhaust pipe 52. As a result, the inside of the chamber 2 is exhausted. Although not shown in the figure, an upstream side of the exhaust device 53 is provided with an apparatus for trapping unreacted substances and by-products. By operating the exhaust device 53, the inside of the chamber 2 can be reduced in pressure to a predetermined degree of vacuum. In addition, a shield box 23 is provided on the lead member 15, and an exhaust port 54 is provided on the upper portion thereof. From this exhaust port 54, heat exhaustion of the inside dry air and the outside dry air in the shield box 23 is performed.
Moreover, the CVD film-forming apparatus 1 which concerns on this embodiment has the showerhead temperature control means 60 which controls the temperature of the showerhead 10. As shown in FIG. Hereinafter, this temperature control means 60 will be described in detail.
The showerhead temperature control means 60 includes the above-described inner heater 17 and outer heater 18 as a heating mechanism, dry air supply pipes 61a and 61b for supplying dry air as a cooling mechanism, and the inner heater 17. ), A temperature detecting mechanism comprising thermocouples 65a, 65b, 66a, and 66b for monitoring the temperature of the outer heater 18 and the bottom plate 10c of the showerhead 10, and a controller 62 for controlling them. I have it as a component.
As enlarged in FIG. 4, the power source 63 is connected to the inner heater 17, and the power source 64 is connected to the outer heater 18. In addition, in the position corresponding to the inner heater 17 disposed on the inner circumferential side on the upper plate 10a of the shower head 10, the thermocouple 65a for detecting the temperature is an insulating plate 131 having a high thermal conductivity on the upper plate. ), And a thermocouple 65b is provided in contact with the bottom plate. At a position corresponding to the outer heater 18 disposed on the outer circumferential side on the upper plate 10a, thermocouples 66a and 66b for detecting the temperature of the outer side of the upper plate 10a and the outer side of the lower plate 10c are provided. It is installed in contact with the bottom plate. A plurality of these thermocouples 65a, 65b, 66a, 66b can be provided, respectively. Moreover, based on the command of the controller 62 and the detection signal of the thermocouples 65a and 65b, the inside temperature controller 67 which carries out temperature control by PID control of the output of the inside heater 17 is provided, and the controller ( On the basis of the command of 62 and the detection signals of the thermocouples 66a and 66b, an outer temperature controller 68 is provided which PID-controls the output of the outer heater 18 and the like to perform temperature adjustment. And these temperature controllers 67 and 68 implement | achieve temperature control of the showerhead 10 at the time of a heating.
On the other hand, dry air supplied from the dry air supply pipe 61a is introduced into the space 19 through the cooling gas passage 20a of the heat insulating member 20 as a refrigerant body. Then, the heat discharged from the inner heater 17 into the space 19 is taken out and discharged from the exhaust port 54 of the shield box 23 provided above the lid member 15 via the discharge port 20b. On the other hand, dry air supplied from the dry air supply pipe 61b is discharged from the discharge hole below the pipe, takes heat from the outside of the shower head such as the outside heater 18, and exhaust port 54 of the shield box 23. Is discharged from The air operation valves 69a and 69b are provided in the dry air supply piping 61a and 61b, respectively. These air operated valves 69a and 69b are controlled by the controller 62.
At the time of heating using such a showerhead control means 60, preferable temperature control can be implement | achieved by control as shown in FIG. In the control shown in FIG. 5, the temperature setting is first performed by the controller 62. And the temperature controller 67 controls the output of the inner heater 17 so that the detection temperature of the thermocouples 65a and 65b may become set temperature. The detection values of the thermocouples 65a and 65b are also output to the temperature controller 68 via the controller 62. And the temperature controller so that the difference between the detection temperature of the thermocouples 66a and 66b in the position corresponding to the outer heater 18 and the detection temperature of the thermocouples 65a and 65b in the position corresponding to the inner heater 17 becomes zero. 68 controls the output of the outer heater 18. Thereby, it is controlled so that the temperature of the outer part of the showerhead 10 and the temperature of an inner part become substantially the same.
In addition, the upper surface of the upper plate 10a of the showerhead 10 and the portion thereon are exposed to the atmospheric atmosphere. The thermocouples 65b, 66b of the showerhead temperature control means 60 are arranged in the showerhead, which may be vacuum, but other components are arranged in the atmosphere.
In addition, as shown in FIG. 2, the showerhead 10 is reversible out of the chamber 2 by the inversion mechanism 80 having a hinge mechanism. Thereby, as shown in FIG. 6, the showerhead 10 can exist almost completely outside the chamber 2 in the state which faced the gas discharge surface upward. Therefore, maintenance of the showerhead 10 can be performed very easily. Specifically, from the state of FIG. 6, first, the plurality of support members 49 can be easily separated to the outside by removing the fixing screw (arrow ①). When the support member 49 is separated, it may be easy to separate the filler 48 upwards (arrow (2)). And when the filler 48 is isolate | separated, maintenance of the showerhead 10 itself becomes possible. For example, the lower plate 10c and the stopping plate 10b can be easily separated upwards (arrows ③). After the showerhead 10 is inverted, it is preferable that the showerhead 10 is maintained at a position rotated by 180 °, but the angle of rotation may be an angle of about 180 °. In addition, in order to keep the showerhead 10 at such an angle, for example, a gas spring or the like can be used.
Next, the processing operation of the CVD film-forming apparatus 1 configured as described above will be described. First, before forming a Ti thin film on the semiconductor wafer W, a precoat film is formed into a film on the surface of the showerhead 10, the stage 3, etc. in the following procedure. First, the heater 6 of the stage 3, the inner and outer heaters 17 and 18 of the shower head 10 are heated around the chamber 2. Then, while the inside of the chamber 2 is exhausted by the exhaust device 53, a predetermined gas is introduced into the chamber 2 at a predetermined flow rate ratio, and the inside of the chamber 2 is at a predetermined pressure. Then H 2 Gas, TiCl 4 A film forming gas containing gas and other gases is supplied into the chamber 2 at a predetermined flow rate, high frequency power is supplied from the high frequency power source 47 to the shower head 10, and plasma is generated in the chamber 2, The Ti film is formed on the shower head 10, the stage 3, and the like. Then, the power supply of the high frequency power source 47 and TiCl 4 Supply of gas stops. Then NH 3 Gas and other gases are supplied at a predetermined flow rate, and high frequency power is supplied from the high frequency power source 47 to the shower head 10 again to generate plasma, and the surface of the formed Ti film is nitrided so that the shower head 10 and A stable precoat film is formed on top of the stage 3 and the like. After completion of the nitriding treatment, power supply of the high frequency power supply 47 and NH 3 Supply of gas stops.
After the preliminary coating process is completed, the gate valve (not shown) is opened, the semiconductor wafer W is loaded into the chamber 2 and mounted on the stage 3. Then H 2 Gas, TiCl 4 gas, and other gases are supplied at a predetermined flow rate, high frequency power is supplied from the high frequency power source 47 to the showerhead 10, and plasma is generated in the chamber 2, thereby forming a semiconductor wafer W. A Ti film is formed on the film. Then, the supply of electric power is stopped and the supply of the TiCl 4 gas of the high-frequency electric power source 47. Then NH 3 Gas and other gases are supplied at a predetermined flow rate, and high frequency power is supplied from the high frequency power source 47 to the shower head 10 again to generate plasma, and the Ti film formed on the semiconductor wafer W is nitrided. After the nitriding process is finished, the power supply of the high frequency power supply 47 and the supply of NH 3 are stopped. In this manner, after the film forming process is completed, the processed semiconductor wafer W is carried out from the chamber 2, the semiconductor wafer W to be processed next is loaded, and the same on the semiconductor wafer W. The film forming process is performed.
After the film forming process is performed on the predetermined number of semiconductor wafers W, the stage 3 and the showerhead 10 are lowered to a predetermined temperature, and ClF 3 , which is a cleaning gas, is heated. Gas is supplied into the chamber 2 to perform a cleaning process.
In the above series of processes, according to the present embodiment, the following effects can be obtained by providing the showerhead temperature control means 60 in the showerhead 10.
Unreacted product [TiCl x (x = 1,2,3)] is generated during the preliminary coating process or the film forming process, but in order to form a stable film in the showerhead, it is necessary to volatize such TiCl x as a gas. For that purpose, the temperature of 425 degreeC or more, Preferably it is 500 degreeC or more. Since the conventional showerhead is passively heated by the heater in the stage, there is no guarantee that the showerhead will always be 425 ° C or higher. Therefore, there has been a case where a stable precoat film cannot be formed for the showerhead. However, in this embodiment, since the shower head temperature control means 60 is provided in the shower head 10, the shower head 10 can be actively made 425 degreeC or more. In addition, by supplying a gas containing NH 3 gas and reducing TiCl x by nitriding, it is possible to form a stable precoat film on the showerhead 10.
In addition, when heating the inside of the chamber 2 to film-forming temperature, when the showerhead 10 is heated up only by the radiant heat of the stage 3 like conventionally, when the showerhead 10 becomes stable at predetermined heating temperature, Long time is needed. However, in the present embodiment, in addition to passive heating from the heater 6 of the stage 3, the showerhead 10 is actively heated in advance by the heaters 17 and 18, which are the temperature control means 60. It is. For this reason, the whole of the showerhead 10 can be heated in a short time, so that the surface temperature of the bottom plate of the showerhead 10 can be stabilized to a constant temperature. Thereby, the temperature in the chamber 2 can be stabilized to predetermined temperature in a short time. In this way, by uniformly controlling the temperature of the shower head 10, the Ti film can be uniformly formed on the semiconductor wafer. In particular, when the apparatus is enlarged as the semiconductor wafer is enlarged to 300 mm, the effect is remarkable.
In addition, the high frequency power supply is turned off during idling. For this reason, in order to maintain the temperature of the showerhead 10 at predetermined temperature conventionally, the temperature of the heater in a stage was set high. On the other hand, in this embodiment, since the temperature of the shower head 10 is controlled by the shower head temperature control means 60, even when idling, the temperature of the shower head 10 can be maintained at a predetermined temperature and stabilized. Can be.
In addition, at the time of a cleaning process, it is necessary to reduce the temperature of the showerhead 10 to the cleaning temperature of 200 to 300 degreeC from film-forming temperature. Conventionally, since the heat dissipation of the shower head was poor, a long time was required for the temperature drop. However, in the present embodiment, in the chamber 2, the showerhead temperature control means 60 supplies the dry air as the refrigerant body from the dry air supply pipes 61a and 61b to the upper portion of the showerhead 10 and cools it. Can be quickly lowered to the cleaning temperature.
In the apparatus of this embodiment, since the upper surface of the top plate 10a of the showerhead 10 is exposed to the atmospheric atmosphere, most members of the showerhead temperature control means 60 can be provided in the atmospheric atmosphere. Therefore, the showerhead temperature control means 60 is easy to handle.
In addition, in this embodiment, the inner heater 17 and the outer heater 18 are provided as a heating mechanism of the showerhead temperature control means 60, and two-zone control is implemented. And as shown in FIG. 4, the output of the inner heater 17 is controlled by the temperature controller 67 so that the detection temperature of thermocouple 65a, 65b may be set temperature, and corresponds to the outer heater 18. As shown in FIG. The outer heater 18 is controlled by the temperature controller 68 so that the difference between the detected temperature of the thermocouples 66a and 66b at the position and the detected temperature of the thermocouples 65a and 65b at the position corresponding to the inner heater 17 is zero. Is controlled so that the outer part and the inner part of the showerhead 10 are always at the same temperature. For this reason, heat dissipation from the outer part of the shower head 10 can be suppressed, and temperature controllability can be improved. In particular, in the case where the size of the semiconductor wafer is enlarged to 300 mm, heat is easily released from the outside of the shower head 10, so the two-zone control is more effective.
During maintenance of the showerhead 10, the showerhead 10 is inverted out of the chamber 2 by the inversion mechanism 80. Thereby, the shower head 10 can be maintained in the state which faced the gas discharge surface as shown in FIG. Therefore, maintenance of the showerhead 10 can be performed very easily. Specifically, in the state of FIG. 6, first, the plurality of support members 49 are separated outward. Subsequently, the filler 48 is separated upward. Thereafter, the bottom plate 10c and the stop plate 10b of the showerhead 10 may be separated upwards. As described above, since the separating operation of each member is very easy, the maintenance of the showerhead 10 can be performed very easily.
In addition, this invention is not limited to the said Example, A various change is possible within the range of the idea of this invention. For example, although the film formation process of the Ti film has been described as an example in the above embodiment, the present invention is not limited thereto, and may be applied to the CVD film formation process of other films such as TiN films. In addition, although the case where plasma is formed was demonstrated as an example, plasma is not necessarily essential. Also for the temperature control means of a showerhead, it is not limited to the said structure, The control method is not limited to the said method, either. For example, dry air was used as the refrigerant, but Ar, N 2 And other gases may also be used. When the plasma is not used, a liquid such as water or a coolant may be used as the refrigerant. Moreover, although the process of the semiconductor wafer was demonstrated as an example, it is not limited to this, It can apply also to the process with respect to other board | substrates, such as the glass substrate for liquid crystal display devices.
Hereinafter, the modified example of the said Example is demonstrated concretely.
As shown in FIG. 9, in the said Example, the 2nd gas discharge part 12 which communicates with the 2nd gas passage 12b is arrange | positioned in the substantially center part of the space 11b formed below the interruption plate. The opening 12c is formed in the side surface of the gas discharge part 12. As shown in FIG. As a result, the gas supplied through the second gas passage 12b formed in the upper portion of the interruption plate in communication with the second gas supply pipe 14b is discharged from the opening 12c of the gas discharge part 12 to directly open the space ( 11b).
However, in such an embodiment, there may be a case where it is not sufficient for the gas supplied via the second gas passage 12b to diffuse evenly into the space 11b of the stopping plate 10b.
Therefore, it is preferable to connect the pipe for gas diffusion promotion to the opening 12c of the second gas discharge part 12 disposed in the substantially center portion of the space 11b.
In the case of the interruption plate 10b as shown in FIG. 10, in the space 11b below the interruption plate 10b, a substantially H-shaped gas diffusion promotion pipe 110 is used to uniformly diffuse the second gas. Is arranged. The central portion of the substantially H-shaped gas diffusion promoting pipe 110 is connected to the second gas discharge part 12. In addition, the gas discharge holes 110a are formed in the four tip portions of the gas diffusion promotion pipe 110. Each gas diffusion promotion pipe 110 is welded and formed integrally. In addition, the support pillar 110b for supporting the gas diffusion promotion pipe 110 is fixed to the upper surfaces of the stop plate 10b and the bottom plate 10c to prevent shaking of the gas diffusion promotion pipe 110. .
In this case, the gas discharge hole 110a formed in each tip part is formed so that it may open toward the upper plate side, and the gas supplied through the 2nd gas discharge part 12 will be spread evenly evenly in the space 11b. It is supposed to be. The arrow in FIG. 10 shows the outline of the flow of the gas supplied from the gas discharge hole 110a into the space 11b. However, the shape, the direction, the position of the gas diffusion promotion pipe 110, and the number and openings of the gas discharge holes 110a include the gas supplied through the second gas passage 12b in the space 11b. It will not specifically limit, if it can spread enough uniformly. The gas discharge hole 110a may be formed to open laterally, for example.
In addition, about the arrangement position of the gas discharge hole 110a, it may be opened evenly in the middle to the front-end | tip of a pipe, and it is preferable to arrange | position equally in the space 11b.
FIG. 11: shows sectional drawing of the form which attached the stopping plate 10b to the lower plate 10c and the gas diffusion promotion pipe | tube 110 shown in FIG. Although FIG. 11 shows the cross section which penetrates the center tube 110c of the gas diffusion promotion pipe 110 fundamentally, the right end part of the gas diffusion promotion pipe 110 contains the gas discharge hole 110a. Indicates.
12 and 13 show a modification of the control system. It is a schematic diagram which shows the modification of the part corresponded to the heating mechanism of FIG. 4, and FIG. 13 is a figure which shows the modification of the control form of FIG.
12 and 13, a noise filter 120 is provided between the control system and each of the thermocouples 65a, 65b, 66a, and 66b, and between the control system and each of the heaters 17 and 18. As shown in FIG. Preferably, the position close to the control measurement is good. Providing the noise filter 120 in this manner is effective for removing noise from the high frequency power source 47 and improving control characteristics.
In addition, in the modification shown in FIG. 14, instead of the ring-shaped outer heater 18 having a circular cross section, a flat donut shaped outer heater 118 is provided. As such, the shape of the heater is not particularly limited.
In addition, in the modification shown in FIG. 14, the insulating plate 131 is formed between the inner heater 17 and the upper plate 10a, and similarly, the insulating plate 132 is also disposed between the outer heater 118 and the upper plate 10a. Although formed, the thickness of each insulation plate 131 is the grade which is not influenced by noise, for example, 0.5 mm-1.0 mm. Since the top plate 10a functions as an electrode for plasma generation, the insulation plates 131 and 132 are preferably thicker in order to suppress the influence of noise received by the heater. However, the insulating plates 131 and 132 need to have high thermal conductivity and heat resistance. Therefore, ceramics such as aluminum nitride are suitable as the material of the insulating plates 131 and 132.
In addition, in the modification shown in FIG. 15, instead of the elastic member 50, such as fluorine-type rubber | gum, the elastic member 150 by Ni alloy materials, such as a corrosion-resistant metal spring, such as an Inconel, is provided. Thus, the form of the elastic member interposed between the side surface of the recessed part 48a of the filler 48 and the side surface of the convex part 49a of the support member 49 is not specifically limited.
Moreover, the outline | summary of the characteristic of the temperature control of this invention and prior art at the time of idling and cleaning is shown to the following table.
Showerhead temperature Stage temperature Response Prior art 470 ° C to 480 ° C 640 ° C to 650 ° C Deposition stage temperature
Need to be above temperature Invention 500 ℃ 640 ℃ Showerhead directly
1: film forming apparatus 2: chamber
4 support member 7 stage holding member
10: shower head 10a: top plate
10b: suspension plate 10c: bottom plate
13a: first gas discharge hole 13b: second gas discharge hole
14a: 1st gas introduction pipe 14b: 2nd gas introduction pipe
15: lead member 16: insulation member
17: inner heater 18: outer heater
20: heat insulation member 26: gas introduction member
47: high frequency power supply 48: filler
53 exhaust device 60 temperature control means
In the film forming apparatus for forming a Ti film,
A chamber for processing a target object,
A stage for mounting the target object;
A heater embedded in the stage and heating the target object;
A stage holding member protruding downward from the chamber,
A cylindrical support member joined to a lower surface of the stage and fixed to the stage holding member;
A shower head provided on the chamber and supplying a deposition gas for forming the Ti film into the chamber;
A showerhead temperature control means for controlling the temperature of the showerhead by heating and cooling the showerhead;
A power supply rod connected to an upper surface of the shower head and configured to supply high frequency power;
A lead member for opening and closing the chamber;
An annular insulating member disposed on the lead member and attaching the shower head;
An exhaust pipe for connecting an exhaust device for exhausting the inside of the chamber,
With top plate,
With suspended plate,
With bottom plate,
The bottom plate is
A first gas discharge hole and a second gas discharge hole for discharging the deposition gas for forming the Ti film into the chamber,
The top plate is
The horizontal part of the concave shape,
An annular support part which is continuously formed above the outer circumference of the horizontal part,
It has a first gas introduction tube and a second gas introduction tube connected to the upper surface of the upper plate,
The stopping plate is
It is fixed to the lower portion of the outer periphery of the upper plate, and further, a recess is formed in the upper surface of the interruption plate, formed by the recess of the lower surface of the upper plate and the upper surface of the interruption plate and in communication with the first gas introduction pipe With the first space,
A plurality of first gas passages formed in communication with the first space and the first gas discharge hole;
A plurality of grooves formed in a lower surface of the middle plate and an upper surface of the lower plate, the second space communicating with the second gas discharge hole;
And an annular quartz filler provided in a space surrounding a lower portion of the shower head and surrounded by side walls of the chamber,
In addition, the showerhead temperature control means
A heater provided on an upper surface of the upper plate, the upper surface of the upper plate being exposed to an atmospheric atmosphere,
A space provided above the heater provided on an upper surface of the horizontal portion of the upper plate;
And a heat insulating member provided above the space provided above the heater, wherein the surface temperature of the lower plate is stabilized to a constant temperature by controlling the temperature of the shower head by the shower head temperature control means to achieve uniform Ti. A film can be deposited on the target object
Deposition device.
The showerhead temperature control means,
Further provided with a dry air supply pipe for supplying dry air to the space provided above the heater
An elastic member is provided between the filler and the lead member.
And a shield box provided on the lead member, and an exhaust port for exhausting heat in the shield box.
And a reversal mechanism for reversing and holding the showerhead by using a gas spring up to 180 °.
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KR20100065403A KR20100065403A (en) 2010-06-16
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