WO2021225047A1 - 成膜装置およびプレート - Google Patents
成膜装置およびプレート Download PDFInfo
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- WO2021225047A1 WO2021225047A1 PCT/JP2021/013327 JP2021013327W WO2021225047A1 WO 2021225047 A1 WO2021225047 A1 WO 2021225047A1 JP 2021013327 W JP2021013327 W JP 2021013327W WO 2021225047 A1 WO2021225047 A1 WO 2021225047A1
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- 230000008021 deposition Effects 0.000 title abstract 7
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- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/10—Heating of the reaction chamber or the substrate
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
- C30B25/02—Epitaxial-layer growth
- C30B25/14—Feed and outlet means for the gases; Modifying the flow of the reactive gases
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L21/00—Processes or apparatus adapted for the manufacture or treatment of semiconductor or solid state devices or of parts thereof
- H01L21/67—Apparatus specially adapted for handling semiconductor or electric solid state devices during manufacture or treatment thereof; Apparatus specially adapted for handling wafers during manufacture or treatment of semiconductor or electric solid state devices or components ; Apparatus not specifically provided for elsewhere
- H01L21/67005—Apparatus not specifically provided for elsewhere
- H01L21/67011—Apparatus for manufacture or treatment
- H01L21/67098—Apparatus for thermal treatment
- H01L21/67109—Apparatus for thermal treatment mainly by convection
-
- C—CHEMISTRY; METALLURGY
- C30—CRYSTAL GROWTH
- C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
- C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
- C30B29/10—Inorganic compounds or compositions
- C30B29/36—Carbides
Definitions
- This embodiment relates to a film forming apparatus and a plate.
- the film forming apparatus used for the epitaxial growth method of a SiC film or the like needs to heat the substrate at a high temperature of 1500 ° C to 1700 ° C. Therefore, for example, the gas supply unit provided in the upper part of the film forming chamber is also exposed to a high temperature by radiation from a heater or the like for heating the substrate.
- the gas supply unit provided in the upper part of the film forming chamber is also exposed to a high temperature by radiation from a heater or the like for heating the substrate.
- deposits containing the raw material and the dopant adhere to the surface of the gas supply section.
- the deposits adhering to such a gas supply unit become particles and fall on the substrate, which causes a device failure.
- the doping concentration of the SiC film changes with time due to the release of the dopant gas from the deposits adhering to the gas supply unit (memory effect).
- a film forming apparatus and a plate capable of controlling the concentration and flow rate of the process gas supplied in the substrate surface in the radial direction.
- the film forming apparatus has a film forming chamber capable of accommodating the substrate, a plurality of nozzles provided above the film forming chamber to supply the process gas onto the film forming surface of the substrate, and suppress the temperature rise of the process gas.
- a gas supply unit having a cooling unit, a heater for heating the substrate to 1500 ° C. or higher, and a lower surface facing the lower surface of the gas supply unit in which the first openings of a plurality of nozzles are formed in the film forming chamber.
- the plates are spaced apart from each other, the plates having a diameter smaller than that of the first opening, and a plurality of second openings arranged substantially evenly in the plate surface facing each other with the gas supply part. Includes a partition that projects to the surface and partitions the inside of the plate into a plurality of areas.
- the plate according to the present embodiment is a plate that faces the gas supply unit that supplies gas on the film formation surface of the substrate in the film formation chamber and is arranged apart from the gas supply unit, and is provided in the gas supply unit.
- a plurality of second openings having a diameter smaller than that of the first opening of the nozzle for supplying the gas, and being arranged substantially evenly in the plate surface, and a partition portion protruding on the facing surface with the gas supply portion.
- FIG. 5 is a cross-sectional view showing a configuration example of a film forming apparatus according to the first embodiment.
- the cross-sectional view which shows the structural example of the head of a chamber.
- the figure which shows the arrangement relationship with a plate and a 1st opening.
- the cross-sectional view which shows the structural example of the gas supply part which attached the temperature measuring mud to a nozzle. Enlarged view showing the gap between the gas supply and the plate.
- the graph which shows the variation of the doping concentration of the membrane in the plane of a substrate.
- the graph which shows the variation of the film thickness in the plane of a substrate The graph which shows the variation of the film thickness in the plane of a substrate.
- FIG. 11 is a cross-sectional view taken along the line 12-12 of FIG.
- the perspective view which shows the structural example of the jig The perspective view which shows the structural example of the jig.
- FIG. 1 is a cross-sectional view showing a configuration example of the film forming apparatus 1 according to the first embodiment.
- the film forming apparatus 1 includes a chamber 10, a liner 20, cooling units 31, 35, a gas supply unit 40, an exhaust unit 50, a susceptor 60, a support unit 70, a rotation mechanism 80, and a lower heater 90.
- the upper heater 95, the reflector 100, the liner 110, the plate 120, and the heat insulating material 96 are provided.
- the chamber 10 as a film forming chamber can accommodate the substrate W and is made of, for example, stainless steel.
- the inside of the chamber 10 is depressurized by a vacuum pump (not shown).
- the chamber 10 has a head 12 and a body 13.
- the head 12 is provided with a gas supply unit 40 and a cooling unit 31.
- the temperature rise of the process gas including the raw material gas, the carrier gas, the assist gas, and the doping gas supplied from the gas supply unit 40 is suppressed by the cooling unit 31 inside the head portion 12 of the chamber 10. Therefore, the inside of the head portion 12 of the chamber 10 is hereinafter referred to as a temperature rise suppression region Rc.
- the assist gas is a gas that plays a role of suppressing an excessive reaction of the raw material gas. For example, when a Si-based gas is used as the raw material gas in the formation of the SiC film, adding HCl as the assist gas has an effect of suppressing the clustering of Si in the gas phase.
- a susceptor 60 Inside the chamber 10 in the body portion 13, a susceptor 60, a rotation mechanism 80, a lower heater 90, an upper heater 95, and the like are provided inside the chamber 10 in the body portion 13.
- the gas supplied from the gas supply unit 40 is heated inside the body unit 13 and reacts on the surface of the substrate W. As a result, the film is epitaxially grown on the substrate W.
- the film is, for example, a SiC film or the like.
- the inner diameter of the liner 110 provided on the head 12 of the chamber 10 is equal to or smaller than the inner diameter of the liner 20 provided on the body 13.
- the liner 110 is a hollow cylindrical member that covers the inner wall of the head 12 of the chamber 10 and suppresses the formation of deposits on the inner wall of the head 12.
- a material having a high infrared transmittance for example, quartz is used. By doing so, it is possible to prevent the liner 110 from being heated to a high temperature by radiation from the upper heater 95 and the lower heater 90 via the liner 20, the susceptor 60, and the substrate W. Further, the liner 110 is arranged so as not to rub against the inner wall of the body portion 13 even if it is thermally deformed.
- the outer wall surface of the liner 110 and the inner wall surface of the body portion 13 are excluding a support portion (support portion 140 in FIG. 2) (not shown) provided on the inner wall side of the head portion 12 that supports the liner 110. , Are placed apart.
- the liner 20 is a hollow cylindrical member that covers the inner wall of the chamber 10 and suppresses the formation of deposits on the upper heater 95, the heat insulating material 96, and the inner wall of the body portion 13.
- the liner 20 is heated to a high temperature by radiation from the upper heater 95, and serves as a hot wall for heating the substrate W by radiation.
- a material having high heat resistance is selected, and for example, carbon, SiC-coated carbon, or the like is used.
- the cooling unit 31 is provided on the head portion 12 of the chamber 10, and serves as a flow path for, for example, a refrigerant (for example, water). As the refrigerant flows through the flow path, the cooling unit 31 suppresses the temperature rise of the gas in the temperature rise suppressing region Rc. Further, as shown in FIG. 2 to be described later, a cooling unit 32 is also provided around each nozzle N of the gas supply unit 40. As a result, it is possible to suppress the temperature rise of the gas supplied to the temperature rise suppressing region Rc. At the same time, the cooling unit 31 prevents the head portion 12 of the chamber 10 from being heated by radiation from the upper heater 95 and the lower heater 90.
- a refrigerant for example, water
- the cooling unit 35 is provided in the body portion 13 of the chamber 10, and is, for example, a flow path for a refrigerant (for example, water) like the cooling unit 31. However, the cooling unit 35 is not provided to cool the space inside the body portion 13, but is provided so that the heat from the upper heater 95 and the lower heater 90 does not heat the body portion 13 of the chamber 10. ing.
- a refrigerant for example, water
- the gas supply unit 40 is provided on the upper surface of the chamber 10 facing the surface of the substrate W, and has a plurality of nozzles.
- the gas supply unit 40 is provided above the lower heater 90 and the upper heater 95, and is provided above the temperature rise suppression region Rc.
- the gas supply unit 40 passes through a nozzle to a raw material gas (Si-based gas, C-based gas, etc.), a doping gas (nitrogen gas, aluminum-containing gas, etc.), an assist gas (HCl gas, etc.), and a carrier gas (hydrogen gas, etc.). (Algon gas, etc.) is supplied to the temperature rise suppression region Rc inside the chamber 10.
- the exhaust unit 50 is provided at the bottom of the chamber 10 and exhausts the gas after being used for the film forming process to the outside of the chamber 10.
- the susceptor 60 is an annular member on which the substrate W can be placed, and is made of carbon, for example.
- the support portion 70 is a cylindrical member capable of supporting the susceptor 60, and is made of carbon like the susceptor 60, for example.
- the support portion 70 is connected to the rotation mechanism 80, and is configured to be rotatable by the rotation mechanism 80.
- the support portion 70 can rotate the substrate W together with the susceptor 60.
- the susceptor 60 and the support 70 are made of a material having a heat resistance of 1500 ° C. or higher, such as SiC (silicon carbide), TaC (tanantalum carbide), W (tungsten), and Mo (molybdenum). May be good. Further, as the susceptor 60 and the support portion 70, carbon coated with SiC, TaC or the like can also be used.
- the lower heater 90 is provided below the susceptor 60 and the substrate W and inside the support portion 70.
- the lower heater 90 heats the substrate W from below via the susceptor 60.
- the upper heater 95 is provided along the side surface of the heat insulating material 96 provided on the inner circumference of the body portion 13 of the chamber 10, and heats the substrate W from above via the liner 20.
- the lower heater 90 and the upper heater 95 heat the substrate W to a high temperature of 1500 ° C. or higher while the rotating mechanism 80 rotates the substrate W at a rotation speed of, for example, 300 rpm or more. As a result, the substrate W can be heated uniformly.
- the reflector 100 is provided between the head portion 12 and the body portion 13 of the chamber 10, and is made of carbon, for example.
- the reflector 100 reflects heat from the lower heater 90 and the upper heater 95 downward. As a result, the temperature of the head 12 is prevented from rising excessively due to radiation from the lower heater 90 and the upper heater 95.
- the reflector 100 and the cooling unit 31 function so as to make the temperature of the temperature rise suppressing region Rc lower than the reaction temperature of the raw material gas.
- the reflector 100 may be made of a material having a heat resistance of 1500 ° C. or higher, such as SiC (silicon carbide), TaC (tanantalum carbide), W (tungsten), and Mo (molybdenum).
- the reflector 100 may be a single thin plate, but it is preferable that the reflector 100 has a structure in which a plurality of thin plates are separated at appropriate intervals in order to efficiently reflect heat.
- FIG. 2 is a cross-sectional view showing a configuration example of the head portion 12 of the chamber 10.
- the gas supply unit 40 is provided with a plurality of nozzles N.
- the nozzle N is provided so as to eject the raw material gas, the doping gas, the assist gas, and the carrier gas toward the surface of the substrate W mounted on the susceptor 60 in the chamber 10.
- the gas supply unit 40 ejects a gas such as a raw material gas, a doping gas, an assist gas, and a carrier gas into D1 in a substantially vertical direction (that is, a substantially vertical direction) with respect to the surface of the substrate W.
- the nozzle N introduces a gas such as a raw material gas, a doping gas, an assist gas, and a carrier gas into the temperature rise suppression region Rc from a gas pipe (not shown) connected to the nozzle N.
- the first opening OP1 of the nozzle N is inside the chamber 10 and is an opening of the nozzle N for ejecting gas.
- the gas supply unit 40 is provided with a cooling unit 32 around the nozzle N to prevent the temperature of the gas supply unit 40 and the head portion 12 from rising excessively.
- the liner 110 is a hollow cylindrical member that covers the inner wall of the head 12 in the chamber 10 and suppresses the formation of deposits on the inner wall of the head 12.
- the liner 110 is supported by a support portion 140 provided on the inner wall side of the head 12.
- a material having a high infrared transmittance for example, quartz is used. By doing so, it is possible to prevent the liner 110 from being heated to a high temperature by radiation from the upper heater 95 and the lower heater 90 via the liner 20, the susceptor 60, the substrate W, and the like. Further, the liner 110 is arranged so as not to come into contact with the inner wall of the head 12 even if it is thermally deformed. Therefore, the outer wall surface of the liner 110 is arranged apart from the inner wall surface of the head 12 except for the support portion 140.
- the plate 120 is provided at the lower part of the gas supply unit 40 and is provided along the inner edge of the liner 110.
- the plate 120 has a substantially circular planar shape and is made of a material material having a high infrared transmittance such as quartz. By doing so, it is possible to prevent the plate 120 from being heated to a high temperature.
- the plate 120 is partially placed on the liner 110 by the support 121d of the plate 120. Further, a gap GP2 is provided between the plate 120 and the liner 110, except for the contact portion between the support portion 121d and the liner 110. The gap GP2 allows the purge gas from the opening OP10, which will be described later, to flow along the inner peripheral side surface of the liner 110.
- the plate 120 is provided in the chamber 10 at a position facing the first openings OP1 of the plurality of nozzles N of the gas supply unit 40, and is arranged away from the lower surface of the gas supply unit 40.
- the plate 120 is provided so as to cover the lower surface of the gas supply unit 40 having the first opening OP1.
- the plate 120 has a plurality of second openings OP2 arranged substantially evenly in the plate surface.
- the second opening OP2 has a diameter smaller than that of the first opening OP1. Therefore, the gas from the first opening OP1 temporarily stays in the gap GP, and then is introduced substantially evenly into the temperature rise suppressing region Rc via the second opening OP2. As described above, the plate 120 has a gas rectifying effect due to the second opening OP2.
- the plate 120 includes partition portions 121a, 121b, and 121c that protrude from the surface F120 facing the gas supply portion 40. As will be described later, a plurality of partition portions 121a, 121b, 121c are provided concentrically in a substantially circular shape in the facing surface F120 of the plate 120.
- the opening OP10 provided in the gas supply unit 40 is a hole provided for supplying purge gas.
- the purge gas supplied from the opening OP10 flows along the inner peripheral side surface of the liner 110 through the gap GP2 between the plate 120 and the liner 110. By doing so, it is possible to make it difficult for the raw material gas introduced from the second opening OP2 into the temperature rise suppression region Rc to reach the liner 110, and suppress the formation of reaction by-products on the surface of the liner 110. ..
- FIG. 3 is a diagram showing the arrangement relationship between the plate 120 and the first opening OP1.
- FIG. 4 is a cross-sectional view taken along the line 4-4 of FIG.
- FIG. 5 is a side view of the plate 120. The configuration of the plate 120 and the arrangement of the first opening OP1 will be described with reference to FIGS. 3 to 5.
- the plate 120 has a plurality of partition portions 121a, 121b, 121c on the facing surface F120.
- the central region surrounded by the first partition portion 121a on the innermost side of the partition portions 121a, 121b, and 121c is the first plate region R1.
- the intermediate region between the second partition portion 121b and the first partition portion 121a on the outer peripheral side of the first partition portion 121a is the second plate region R2.
- the outer region between the third partition portion 121c and the second partition portion 121b on the outer peripheral side of the second partition portion 121b is the third plate region R3.
- the second opening OP2 is arranged substantially evenly in the plate surface, and the gas supplied to each of the regions R1 to R3 is introduced into the chamber 10 substantially evenly.
- the first opening OP1 facing the first plate region R1 is designated as OP1_1
- the first opening OP1 facing the second plate region R2 is designated as OP1_2
- the first opening OP1 facing the third plate region R3 is designated as OP1_3. ..
- the openings OP1_1 to OP1_3 supply gas to the regions R1 to R3 partitioned by the partition portions 121a to 121c, respectively.
- the nozzles N of the openings OP1-1 to OP1_3 supply gas having different concentrations or different types (compositions) to the gap GP between the gas supply unit 40 and the plate 120. Therefore, in the gap GP, the gases supplied to the regions R1 to R3 are hardly mixed with each other by the partition portions 121a to 121c, and are introduced into the chamber 10 through the second opening OP2.
- the gas supply unit 40 includes a raw material gas (for example, silane gas, propane gas, etc.), a doping gas (for example, nitrogen gas, TMA (Trimethylaluminium) gas, diboran, etc.), an assist gas (HCl gas, etc.), and a carrier gas (for example, hydrogen). Gas, argon gas, etc.) is supplied from nozzle N.
- a raw material gas for example, silane gas, propane gas, etc.
- a doping gas for example, nitrogen gas, TMA (Trimethylaluminium) gas, diboran, etc.
- an assist gas HCl gas, etc.
- a carrier gas for example, hydrogen
- the gas supply unit 40 can change the ratio or concentration of the raw material gas, the doping gas, the assist gas, and the carrier gas in the regions R1 to R3.
- the gas supply unit 40 can change the ratio (C / Si ratio) of the silicon amount of silane of the raw material gas and the carbon amount of propane gas in the regions R1 to R3.
- the gas supply unit 40 can change the flow rate of the hydrogen gas of the carrier gas in the regions R1 to R3.
- the gas supply unit 40 can supply gas having a different concentration ratio to each of the regions R1 to R3. Since the plate 120 has the partition portions 121a to 121c, the mixing of the gas supplied to the gap GPs of R1 to R3 is suppressed, and the gas is introduced into the chamber 10 substantially evenly from the second opening OP2.
- the plate 120 has a second opening OP2 facing the first openings OP1-1 to OP1_3 of the gas supply unit 40, but does not have an opening larger than the second opening OP2. Therefore, the gas supplied from the first openings OP1_1 to OP1_3 is not directly introduced into the chamber 10 as it is, but temporarily stays in the respective gap GPs of the regions R1 to R3, and then passes through the second opening OP2. Is introduced into the chamber 10. As a result, the plate 120 can introduce the gas from each of the regions R1 to R3 into the chamber 10 substantially evenly.
- the gas supply unit 40 has a third opening OP3 as shown in FIG.
- the third opening OP3 is a pyro-optical path for measuring the internal temperature of the chamber 10 with a radiation thermometer (not shown).
- the radiation thermometer measures the surface temperature of the substrate W through a nozzle to which a temperature measuring mud is attached.
- FIG. 6 is a cross-sectional view showing a configuration example of a gas supply unit 40 in which a temperature measuring mado 130 is attached to a nozzle N. It is attached to the third opening OP3 of the nozzle N via the pipe PL1.
- the radiation thermometer measures the surface temperature of the substrate W in the chamber 10 via the pipe PL1.
- the pipe PL1 communicates with the pipe PL2 separately from the temperature measuring mado 130, and gas (for example, hydrogen, argon, etc.) can flow as shown by an arrow A.
- gas for example, hydrogen, argon, etc.
- the temperature measuring mud is provided in each of the third openings OP3 of the regions R1 to R3.
- FIG. 7 is an enlarged view showing the gap GP between the gas supply unit 40 and the plate 120.
- the first distance between the lower surface (gas supply surface) F40 of the gas supply unit 40 and the upper surface (opposing surface) F120 of the plate 120 is d1
- the second distance between the lower surface F40 and the partition portions 121a to 121c is d2.
- the second distance d2 is smaller than the first distance d1.
- the first distance d1 is about 1.0 mm to 8.0 mm and the second distance d2 is about 0.5 mm to 2 mm.
- the first distance d1 is less than 1.0 mm, it becomes difficult to obtain the gas separation effect by the partition portions 121a to 121c.
- the first distance d1 is larger than 8.0 mm, the heat dissipation effect from the plate 120 to the gas supply unit 40 is suppressed.
- the second distance d2 is less than 0.5 mm, the plate 120 may be deformed due to the temperature rise, and a part of the partition portions 121a to 121c may interfere with the gas supply portion 40.
- the partition portions 121a to 121c cannot separate the gas in the regions R1 to R3. Further, it is desirable that the ratio of d1 and d2 (d2 / d1) is 0.5 or less. This is because when d2 / d1 is 0.5 or more, it becomes difficult to obtain the gas separation effect.
- the diameter of the second opening OP2 of the plate 120 is, for example, 0.5 mm or more and 5 mm or less.
- the total area of the second opening OP2 provided on the plate 120 is 5% or more and 25% or less with respect to the area of the surface F120 of the plate 120 or the surface on the opposite side thereof.
- the plate 120 allows the gas to pass unevenly depending on the position of the first opening OP1, so that it becomes difficult to obtain the rectifying effect of the gas. Further, when the total area of the second opening OP2 is less than 5% with respect to the area of the surface F120 of the plate 120 or the surface on the opposite side thereof, the gas flow deteriorates, so that the gas tends to stay in the gap GP. Become. Therefore, it becomes difficult to obtain the gas separation effect of the regions R1 to R3.
- the plate 120 becomes non-uniform depending on the position of the first opening OP1. Since the gas is allowed to pass through, it becomes difficult to obtain the rectifying effect of the plate 120. In addition, the second opening OP2 is easily deformed by heat.
- the film forming apparatus 1 can fluctuate the gas concentration and the flow rate of the regions R1 to R3 while suppressing the mixing of gas in the gap GP by the partition portions 121a to 121c. can. As a result, the uniformity of the film quality (film thickness, doping concentration, mixed crystal composition ratio, crystallinity, etc.) of the film formed on the substrate W can be improved.
- 8A and 8B are graphs showing the doping concentration distribution in the membrane in the W plane of the substrate.
- 8A and 8B show variations in the doping concentration when the ratio (C / Si ratio) of the amount of silicon in the silane of the raw material gas and the amount of carbon in the propane gas is changed in the regions R1 to R3.
- the vertical axis shows the doping concentration (normalized by the average value) of the film (for example, SiC film).
- the horizontal axis is the distance from the center 0, where 0 is the center of the substrate W.
- the gas supply unit 40 sets the C / Si ratio of the gas to 5.7 in the first plate region R1, 1.3 in the second plate region R2, and 1.0 in the third plate region R3, and the substrate W. Gradually lowering from the center to the edge of. As a result, the doping concentration distribution in the film in the surface of the substrate W is relatively low at the center of the substrate W and relatively high at the edges. That is, the doping concentration is substantially U-shaped in the plane of the substrate W.
- the gas supply unit 40 sets the C / Si ratio of the gas to 1.9 in the first plate region R1, 0.18 in the second plate region R2, and 4.3 in the third plate region R3. It is lowered from the center to the end and then raised. As a result, it can be seen that the doping concentration distribution in the membrane is flatter than that shown in FIG. 8A, and the in-plane uniformity of the doping concentration is improved.
- the doping concentration of the film formed on the substrate W is adjusted by adjusting the C / Si ratio of the gas from the center of the gas supply unit 40 to the outer peripheral direction.
- the distribution shape can be controlled. That is, it is possible to improve the in-plane uniformity of the doping concentration of the film formed on the substrate W.
- FIGS. 9A and 9B are graphs showing variations in film thickness when the flow rate of hydrogen gas as a carrier gas is changed in regions R1 to R3.
- the vertical axis indicates the film thickness (standardized by the average value) of the film (for example, SiC film) formed.
- the horizontal axis is the distance from the center 0, where 0 is the center of the substrate W.
- the gas supply unit 40 gently adjusts the flow rate of hydrogen gas from the center to the end of the substrate W to 20 L in the first plate region R1, 62 L in the second plate region R2, and 70 L in the third plate region R3. It is increasing. As a result, the film thickness is relatively thin at the center of the substrate W and thick at the edges. That is, the doping concentration is substantially M-shaped in the plane of the substrate W.
- the gas supply unit 40 sets the flow rate of hydrogen gas to 13.5 L in the first plate region R1, 34.5 L in the second plate region R2, and 104 L in the third plate region R3. It increases sharply from the center to the edge of. As a result, the film thickness is thinned at the outermost end, but is substantially uniform from the center to the end of the substrate W.
- the film forming apparatus 1 can control the distribution shape of the film thickness of the film formed on the substrate W by adjusting the flow rate of the hydrogen gas. That is, it is possible to improve the in-plane uniformity of the film thickness of the film formed on the substrate W.
- FIG. 10 is a diagram showing an arrangement relationship between the plate 120 and the first opening OP1 according to the second embodiment.
- the plate 120 has a fourth opening OP4 at a position corresponding to the third opening (pyro optical path) OP3 described with reference to FIG.
- the diameter of the fourth opening OP4 is preferably the same as or larger than the diameter of the third opening OP3.
- the fourth opening OP4 can flow the hydrogen gas from the third opening OP3 to the chamber 10 without supplying it to the gap GP between the plate 120 and the gas supply unit 40. Further, the third opening OP3 is not blocked by the plate 120. Therefore, the radiation thermometer can accurately measure the temperature of the substrate W through the third opening OP3.
- the plate 120 has a partition portion 121e all around the fourth opening OP4.
- the partition portion 121e is continuous with any of the partition portions 121a to 121c, and individually surrounds each of the fourth opening OP4. Therefore, it is possible to prevent the hydrogen gas from the third opening OP3 from entering the gap GP between the plate 120 and the gas supply unit 40. Thereby, the film forming apparatus 1 can easily control the flow rate of the hydrogen gas in each of the regions R1 to R3.
- FIG. 11 is a diagram showing a configuration example of the plate 120 according to the third embodiment.
- FIG. 12 is a cross-sectional view taken along the line 12-12 of FIG.
- the partition portions 121a and 121b are composed of a plurality of removable jigs (for example, 150a and 150b in FIG. 13).
- the partition portions 121a and 121b may be substantially square, substantially circular, substantially elliptical, or substantially polygonal in a planar layout viewed from the gas supply direction to the plate 120.
- the partition portions 121a and 121b can be formed into an arbitrary planar shape on the plate 120 by combining a plurality of jigs 150a and 150b.
- the partition portions 121a and 121b are provided separately from the plate 120, and the plate regions R1 to R3 are arbitrarily partitioned by a combination of a plurality of jigs 150a, 150b and the like. Can be done.
- the same material as the plate 120 for example, quartz
- the partition portions 121a and 121b may be integrally formed, respectively.
- the partition portions 121a and 121b may be divided into a lower portion and an upper portion as shown in FIG. In this case, the partition portions 121a and 121b are configured by connecting the lower portion and the upper portion, respectively.
- FIG. 13 is a perspective view showing a configuration example of the partition portion 121a.
- FIG. 14 is a perspective view showing a configuration example of the jig 150a.
- FIG. 15 is a perspective view showing a configuration example of the jig 150b.
- the partition portion 121a is composed of a plurality of jigs 150a and 150b having different shapes.
- the partition portion 121a has a substantially quadrangular shape with four rounded corners by combining the four jigs 150a and the four jigs 150b.
- the jig 150a is formed by bending a member of a prism and has a protrusion 151a.
- the protrusion 151a has a planar shape substantially similar to that of the opening OP2 so as to fit into the opening OP2 shown in FIG. 12, and is formed to be slightly smaller than the opening OP2 in the planar shape.
- the length of the jig 150a in the horizontal stretching direction and the length in the vertical stretching direction can be arbitrarily set.
- the jig 150a is curved at 90 degrees to form a substantially quadrangle with four rounded corners, but the corners are curved at an arbitrary angle to form an arbitrary shape. May be formed.
- the jig 150b is formed of a prism member and has a protrusion 151b.
- the protrusion 151b has a planar shape substantially similar to that of the opening OP2 so as to fit into the opening OP2 like the protrusion 151a, and is formed to be slightly smaller than the opening OP2 in the planar shape.
- the length of the jig 150b in the horizontal stretching direction and the length in the vertical stretching direction can be arbitrarily set.
- the jigs 150a and 150b are fixed on the surface of the plate 120, and the partition portion 121a can be formed.
- the jigs 150a and 150b may be integrally formed, respectively.
- the jig 150a may be divided into a lower portion of the protrusion 151a and an upper portion above the protrusion 151a.
- the jig 150b may be divided into a lower portion of the protrusion 151b and an upper portion above the protrusion 151b.
- the jigs 150a and 150b are configured by connecting the lower part and the upper part, respectively.
- the partition portion 121a has a shape in a planar layout as viewed from the gas supply direction to the plate 120 by combining the jigs 150a and 150b or other jigs having a shape or size different from those of the jigs 150a and 150b. Can be changed. Further, the partition portion 121b also has a flat layout as viewed from the gas supply direction to the plate 120 by combining the jigs 150a and 150b or other jigs having a shape or size different from those of the jigs 150a and 150b.
- the shape of the above can be arbitrarily configured.
- the partition portions 121a and 121b project from the surface of the plate 120, partitioning the plate 120 into plate regions R1 to R3. Further, by changing the sizes of the jigs 150a and 150b, the second distance d2 between the lower surface F40 and the partition portions 121a and 121b as shown in FIG. 7 can be adjusted. As a result, the third embodiment can obtain the same effect as the first embodiment.
- FIG. 16 is a diagram showing a configuration example of the plate 120 according to a modified example of the third embodiment.
- the planar shapes of the partition portions 121a and 121b are different from those in FIG. 11 in the planar layout viewed from the gas supply direction to the plate 120.
- Other configurations of this modification may be the same as the configurations of the third embodiment.
- the planar shapes of the partition portions 121a and 121b can be arbitrarily changed depending on the shape and combination of the jigs.
- the number of partition portions may be three or more. By increasing the number of partitions, the plate area can be subdivided. This modification can obtain the same effect as that of the third embodiment.
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Abstract
Description
図1は、第1実施形態による成膜装置1の構成例を示す断面図である。成膜装置1は、チャンバ10と、ライナ20と、冷却部31、35と、ガス供給部40と、排気部50と、サセプタ60と、支持部70と、回転機構80と、下部ヒータ90と、上部ヒータ95と、リフレクタ100と、ライナ110と、プレート120、断熱材96とを備えている。
図10は、第2実施形態によるプレート120および第1開口部OP1との配置関係を示す図である。第2実施形態では、プレート120は、図6を参照して説明した第3開口部(パイロ光路)OP3に対応する位置に第4開口部OP4を有する。第4開口部OP4の径は、第3開口部OP3の径と同じかそれよりも大きいことが好ましい。第4開口部OP4は、第3開口部OP3からの水素ガスを、プレート120とガス供給部40との間の間隙GPに供給することなく、チャンバ10へ流すことができる。また、第3開口部OP3がプレート120に遮られない。よって、放射温度計は、第3開口部OP3を介して基板Wの温度を正確に測定が可能になる。
図11は、第3実施形態によるプレート120の構成例を示す図である。図12は、図11の12-12線に沿った断面図である。第3実施形態によれば、仕切部121a、121bが、着脱可能な複数の治具(例えば、図13の150a、150bなど)によって構成されている。仕切部121a、121bは、プレート120へのガスの供給方向から見た平面レイアウトにおいて、略方形、略円形、略楕円形、略多角形のいずれであってもよい。仕切部121a、121bは、複数の治具150a、150bなどを組み合わせることによって、プレート120上において任意の平面形状に構成することができる。このように、第3実施形態では、仕切部121a、121bが、プレート120と別体として設けられており、複数の治具150a、150bなどの組み合わせによって、プレート領域R1~R3を任意に仕切ることができる。仕切部121a、121bを構成する複数の治具150a、150bなどには、プレート120と同じ材料(例えば、石英)を用いてよい。また、仕切部121a、121bは、それぞれ一体形成されていてもよい。一方、仕切部121a、121bは、図12に示すように、下部と上部とに分かれていてもよい。この場合、仕切部121a、121bは、それぞれ下部と上部とを接続することによって構成される。
図16は、第3実施形態の変形例によるプレート120の構成例を示す図である。本変形例によれば、プレート120へのガスの供給方向から見た平面レイアウトにおいて、仕切部121a、121bの平面形状が図11のそれと異なる。本変形例のその他の構成は、第3実施形態の構成と同様でよい。このように、仕切部121a、121bの平面形状は、治具の形状および組み合わせによって任意に変更可能である。また、仕切部の数は、3つ以上であってもよい。仕切部の数を増大させることによって、プレート領域をより細かく区分けすることができる。本変形例は、第3実施形態と同様の効果を得ることができる。
Claims (17)
- 基板を収容可能な成膜室と、
前記成膜室の上部に設けられ前記基板の成膜面上にプロセスガスを供給する複数のノズルと、前記プロセスガスの温度上昇を抑制する冷却部と、を有するガス供給部と、
前記基板を1500℃以上に加熱するヒータと、
前記成膜室内において前記複数のノズルの第1開口部が形成された前記ガス供給部の下面に対向し、該下面と離間して配置されたプレートを備え、
前記プレートは、
前記第1開口部よりも小さな径を有し、該プレート面内に略均等に配置された複数の第2開口部と、
前記ガス供給部との対向面に突出し、前記プレートの面内を複数領域に仕切る仕切部と、を含む、成膜装置。 - 前記プレートは、前記仕切部で囲まれた第1プレート領域と、前記仕切部の外周側にある第2プレート領域とを有し、
前記第1プレート領域と前記第2プレート領域に、互いに異なる濃度または互いに異なる流量で前記ガス供給部からプロセスガスを供給する、請求項1に記載の成膜装置。 - 複数の前記仕切部が、前記対向面において同心円状に設けられる、請求項1に記載の成膜装置。
- 前記ガス供給部は、前記成膜室の内部温度を測定するための第3開口部を有し、
前記プレートは、前記第3開口部に対向する位置に、前記第3開口部と同じかよりも大きな第4開口部を有し、前記仕切部は、さらに前記第4開口部の周囲に設けられる、請求項1に記載の成膜装置。 - 前記仕切部は、前記第4開口部の周囲に設けられている、請求項4に記載の成膜装置。
- 前記ノズルが対向する前記プレートの対向位置にも、前記第2開口部が設けられている、請求項1に記載の成膜装置。
- 前記ガス供給部と前記プレートとの間の間隙は、1.0mm~8.0mmであり、
前記ガス供給部と前記仕切部との間の間隙は、0.5mm~2mmである、請求項1に記載の成膜装置。 - 前記第2開口部の径は、0.5mm~5mmである、請求項1に記載の成膜装置。
- 前記仕切部は、前記プレートに着脱可能に取り付けられている、請求項1に記載の成膜装置。
- 前記仕切部は、前記第2開口部に嵌め込まれる突起部を有する、請求項9に記載の成膜装置。
- 成膜室内の基板の成膜面上にガスを供給するガス供給部と対向し、該ガス供給部から離間して配置されたプレートであって、
前記ガス供給部に設けられ前記ガスを供給するノズルの第1開口部よりも小さな径を有し、該プレート面内に略均等に配置された複数の第2開口部と、
前記ガス供給部に対する対向面において突出する仕切部と、を備えるプレート。 - 前記仕切部で囲まれた第1プレート領域と、前記仕切部の外周側にある第2プレート領域とを有する、請求項11に記載のプレート。
- 複数の前記仕切部が、前記対向面において同心円状に設けられる、請求項11に記載のプレート。
- 前記ガス供給部は、前記成膜室の内部温度を測定するための第3開口部を有し、
前記第3開口部に対向する位置に、前記第3開口部と同じかよりも大きな第4開口部を有し、前記仕切部は、さらに前記第4開口部の周囲に設けられる、請求項11に記載のプレート。 - 前記ノズルが対向する前記プレートの対向位置にも、前記第2開口部が設けられている、請求項11に記載のプレート。
- 前記仕切部は、当該プレートに着脱可能に取り付けられている、請求項11に記載のプレート。
- 前記仕切部は、それぞれ前記第2開口部に嵌め込まれる突起部を有する、請求項16に記載のプレート。
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EP21800450.5A EP4148768A4 (en) | 2020-05-08 | 2021-03-29 | SEPARATION DEVICE AND PLATE |
JP2022519909A JP7296523B2 (ja) | 2020-05-08 | 2021-03-29 | 成膜装置およびプレート |
KR1020227038534A KR20220164035A (ko) | 2020-05-08 | 2021-03-29 | 성막 장치 및 플레이트 |
US17/971,701 US20230044440A1 (en) | 2020-05-08 | 2022-10-24 | Film forming apparatus and plate |
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