WO2016174860A1 - サセプタ、エピタキシャル成長装置、及びエピタキシャルウェーハ - Google Patents
サセプタ、エピタキシャル成長装置、及びエピタキシャルウェーハ Download PDFInfo
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- WO2016174860A1 WO2016174860A1 PCT/JP2016/002165 JP2016002165W WO2016174860A1 WO 2016174860 A1 WO2016174860 A1 WO 2016174860A1 JP 2016002165 W JP2016002165 W JP 2016002165W WO 2016174860 A1 WO2016174860 A1 WO 2016174860A1
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- susceptor
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- shaped members
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
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- 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
- H01L21/683—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 for supporting or gripping
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/02—Pretreatment of the material to be coated
- C23C16/0209—Pretreatment of the material to be coated by heating
- C23C16/0218—Pretreatment of the material to be coated by heating in a reactive atmosphere
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
- C23C16/24—Deposition of silicon only
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
- C23C16/44—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating
- C23C16/458—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the method of coating characterised by the method used for supporting substrates in the reaction chamber
- C23C16/4582—Rigid and flat substrates, e.g. plates or discs
- C23C16/4583—Rigid and flat substrates, e.g. plates or discs the substrate being supported substantially horizontally
- C23C16/4586—Elements in the interior of the support, e.g. electrodes, heating or cooling devices
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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
- C30B25/12—Substrate holders or susceptors
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- 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
- H01L21/67115—Apparatus for thermal treatment mainly by radiation
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- 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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68735—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by edge profile or support profile
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- 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
- H01L21/683—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 for supporting or gripping
- H01L21/687—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches
- H01L21/68714—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support
- H01L21/68742—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 for supporting or gripping using mechanical means, e.g. chucks, clamps or pinches the wafers being placed on a susceptor, stage or support characterised by a lifting arrangement, e.g. lift pins
Definitions
- the present invention relates to a susceptor for mounting a wafer in an epitaxial growth apparatus, an epitaxial growth apparatus having the susceptor, and an epitaxial wafer that can be manufactured by the epitaxial growth apparatus.
- An epitaxial wafer is obtained by vapor-phase growth of an epitaxial film on the surface of a semiconductor wafer.
- an epitaxial silicon wafer is produced by vapor-phase growth (epitaxial growth) of a single crystal silicon thin film on a silicon wafer. To do.
- the epitaxial growth apparatus 200 includes a chamber 10 including an upper dome 11, a lower dome 12, and a dome mounting body 13, and the chamber 10 defines an epitaxial film forming chamber.
- the chamber 10 is provided with a gas supply port 15 and a gas discharge port 16 for supplying and discharging the reaction gas at positions opposite to the side surfaces thereof.
- a susceptor 20 on which the wafer W is placed is disposed in the chamber 10. The susceptor 20 is supported by the susceptor support shaft 50 from below.
- the susceptor support shaft 50 includes a main column 52 and three arms 54 (one not shown) extending radially from the main column 52 at equal intervals, and three support pins 58 (1) at the tip of the arm.
- the outer peripheral portion of the back surface of the susceptor 20 is fitted and supported by one (not shown).
- the susceptor 20 has three through holes (one is not shown), and the three arms 54 have one through hole.
- Lift pins 44 are inserted through the through holes of the arms and the through holes of the susceptor. The lower end portion of the lift pin 44 is supported by the lifting shaft 60.
- the elevating shaft 60 moves up and down.
- the lift pins 44 move up and down while sliding with the through holes of the arm and the through holes of the susceptor, and the wafer W is moved up and down at the upper end thereof.
- Patent Document 1 describes a technique in which a wafer is directly lifted by a part of a susceptor, instead of directly supporting and lifting the wafer by lift pins. That is, in FIGS. 2 and 3 of Patent Document 1, the lift ring 32 accommodated in the recess provided in the peripheral portion of the susceptor body 22 is relatively lifted from the susceptor body 22 by the lift pins 48, and the lift ring It is described that three lift members 36 projecting inwardly from 32 support the edge portion of the wafer.
- the edge portion of the wafer is supported by a part of the susceptor without locally supporting the wafer with the lift pins. Can be suppressed.
- the chamfered portion (edge portion) of the wafer is supported by point contact by the three lift members 36 (that is, protrusions) protruding inward from the lift ring 32, the depth of the chamfered portion of the wafer exceeds 0.5 ⁇ m. There is concern about the occurrence of size wrinkles.
- the present inventors newly recognized that the technique of Patent Document 1 has the following problems.
- the recess in which the lift ring is accommodated is located on the peripheral edge of the susceptor body and on the outer side of the edge of the wafer. Therefore, during vapor phase growth, an epitaxial film grows by contact of the source gas with the front surface of the lift ring and the front surface of the susceptor body around the recess, and the epitaxial film is composed of the lift ring and the susceptor body. In some cases, a horizontal separation portion is also connected. Thereafter, when the lift ring is lifted relatively from the susceptor body, the epitaxial film connected at the separation portion is broken and dust is generated. Since this dust adheres to the surface of the manufactured epitaxial wafer and causes many defects, its suppression is desired.
- the present invention provides a susceptor and an epitaxial growth that do not generate deep wrinkles due to contact with lift pins or susceptors on the back surface and chamfered portion of the wafer and can suppress dust generation from the susceptor.
- An object is to provide an apparatus.
- Another object of the present invention is to provide an epitaxial wafer in which no wrinkles exceeding a depth of 0.5 ⁇ m that can be generated due to contact with lift pins or susceptors are observed.
- a susceptor for mounting a wafer in an epitaxial growth apparatus A counterbore part on which the wafer is placed is formed on the front surface of the susceptor,
- the susceptor has a susceptor main body, and arc-shaped members respectively placed in two or more recesses provided on the outer peripheral portion of the front surface of the susceptor main body,
- the bottom face of the counterbore part is composed of the entire front surface of the arc-shaped member and a part of the front surface of the susceptor body
- the susceptor body is provided with two or more through-holes for inserting lift pins for supporting the back surfaces of the two or more arc-shaped members and moving the two or more arc-shaped members up and down,
- the entire front surface of the arc-shaped member raised by the lift pins is A susceptor that functions as a support surface that supports
- An epitaxial growth apparatus comprising: a lifting mechanism that supports a lower end portion of the lift pin and lifts the lift pin.
- the susceptor and epitaxial growth apparatus of the present invention do not generate deep wrinkles due to contact with lift pins or susceptors on the back surface and chamfered portion of the wafer, and can suppress dust generation from the susceptor. Also, by using this susceptor and epitaxial growth apparatus, an epitaxial wafer can be manufactured in which no wrinkles exceeding a depth of 0.5 ⁇ m, which can be generated due to contact with lift pins or susceptors, are observed.
- FIG. 2A and 2B are schematic cross-sectional views of a susceptor 20 according to an embodiment of the present invention, in which FIG. 2A shows a state where no wafer is placed (II cross-sectional view of FIG. 2C), and FIG. (C) shows a state in which the wafer W is lifted by the arc-shaped members 40A and 40B.
- (A) is a top view of the susceptor body 30 in the susceptor 20 of FIG. 1
- (B) is a top view of the arc-shaped members 40A and 40B in the susceptor 20 of FIG. 1
- (C) is an arc-shaped member 40A.
- 40B is a top view of the susceptor 20 with the susceptor body 30 placed in the recess.
- FIG. 1 It is an expanded sectional view of Drawing 1 (C). It is sectional drawing similar to FIG. 3 of the susceptor by a comparative example.
- (A) is an exploded perspective view of the susceptor support shaft 50
- (B) is an exploded perspective view of the elevating shaft 60.
- FIG. 200 It is a schematic diagram of the conventional epitaxial growth apparatus 200, and shows the state (during vapor phase growth) in which the lift pins 40 are lowered with respect to the susceptor 20.
- (A) is a prior art example
- (B) is an example of an invention, and is the image which observed the back surface of the epitaxial silicon wafer with the laser microscope.
- An epitaxial growth apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS.
- a susceptor 20 included in the epitaxial growth apparatus 100 according to an embodiment of the present invention will be described with reference to FIGS.
- the epitaxial growth apparatus 100 shown in FIGS. 6 and 7 includes a chamber 10, a heating lamp 14, a susceptor 20 shown in FIGS. 1 and 2, a susceptor support shaft 50 shown in FIG. 5A, and FIG. And a lifting shaft 60 also shown in B).
- the chamber 10 includes an upper dome 11, a lower dome 12, and a dome mounting body 13, and the chamber 10 defines an epitaxial film forming chamber.
- the chamber 10 is provided with a gas supply port 15 and a gas discharge port 16 for supplying and discharging the reaction gas at positions opposite to the side surfaces thereof.
- the heating lamps 14 are disposed in the upper region and the lower region of the chamber 10, and generally, a halogen lamp or an infrared lamp that has a high temperature raising / lowering speed and excellent temperature controllability is used.
- the susceptor 20 is a disk-shaped member for placing the wafer W inside the chamber 10.
- the susceptor 20 can be made of carbon graphite (graphite) as a base material and the surface thereof coated with silicon carbide.
- a counterbore portion 21 on which the wafer W is placed is formed on the front surface of the susceptor 20.
- the diameter of the counterbore portion 21 at the open end may be appropriately set in consideration of the diameter of the wafer W, and is usually made larger by about 1.0 to 2.0 mm than the diameter of the wafer W.
- susceptor 20 is mounted on susceptor body 30 and two recesses 31A and 31B provided on the outer peripheral portion of the front surface of the susceptor body. It has two arcuate members 40A and 40B.
- the front surface of the susceptor body 30 includes a front surface outer peripheral portion 32, a wafer support surface 32A, a vertical wall surface 32B, It includes the front surface center portion 33 and the surfaces of the recesses 31A and 31B (including the bottom surfaces 34A and 34B).
- the front surface outer peripheral portion 32 is located around the counterbore portion 21 shown in FIG.
- the wafer support surface 32A is an inclined surface that constitutes a part of a spot facing portion that is located inside the front surface outer peripheral portion 32 and supports the peripheral edge of the back surface of the wafer W by line contact.
- the vertical wall surface 32B is a wall surface constituting a part of a spot facing portion that is continuous from the inner peripheral end of the wafer support surface 32A.
- the front surface center portion 33 is continuous from the vertical wall surface 32 ⁇ / b> B and constitutes a part of the bottom surface of the spot facing portion 21.
- the recesses 31A and 31B have the same shape as the arc-shaped members 40A and 40B in the front view of FIG. 2A in order to accommodate and place the arc-shaped members 40A and 40B.
- the dimensions of the recesses 31A and 31B are set so that the clearance (clearance) between the arc-shaped members 40A and 40B and the susceptor body 30 is a minimum necessary (for example, about 0.1 to 1.0 mm).
- the susceptor body 30 is provided with four through holes 35 penetrating the bottom surfaces 34A and 34B and the back surface in the vertical direction. The lift pins 44 described later are inserted through the four through holes 35.
- arc-shaped members 40A and 40B have front surfaces 41A and 41B and back surfaces 42A and 42B, respectively, and a necessary minimum gap ( These are arcuate members that are placed in the recesses 31 ⁇ / b> A and 31 ⁇ / b> B respectively with a clearance) when viewed from above.
- the front surfaces 41A and 41B constitute a part of the bottom surface of the spot facing portion 21, and the back surfaces 42A and 42B are in contact with and supported by the bottom surfaces 34A and 34B of the recesses, respectively.
- the outer peripheral surfaces 43A and 43B and the inner peripheral surfaces 45A and 45B of the arc-shaped member have the same curvature in top view, and the curvature is 80 of the curvature of the wafer. It is preferably about 120%, more preferably 100%. Further, from the viewpoint of stably supporting the wafer W, it is preferable that the two arc-shaped members 40A and 40B are positioned substantially line symmetrically as shown in FIG.
- Two lift pins 44 extend from the back surfaces 42A and 42B. These four lift pins 44 are respectively inserted into four through holes 35 provided in the susceptor body.
- the lift pins 44 are vertically moved up and down by a lifting shaft 60 described later, whereby the arc-shaped members 40A and 40B can be attached to and detached from the susceptor body 30 while supporting the back surfaces 42A and 42B of the arc-shaped members. This operation will be described later. From the viewpoint of stable raising and lowering of the arc-shaped member, it is preferable to provide two lift pins 44 per arc-shaped member, and it is preferable to provide these two lift pins near both ends of the arc-shaped member. In the present embodiment, the lift pin 44 is fixed to the arcuate members 40A and 40B, but the lift pin 44 may not be fixed to the arcuate members 40A and 40B.
- the bottom surface of the spot facing portion 21 is formed by the entire front surfaces 41A and 41B of the arc-shaped member and a part of the front surface of the susceptor body (specifically, Is composed of a front surface center portion 33). That is, in the state where the arc-shaped members 40A and 40B are respectively placed in the recesses 31A and 31B and the wafer W is placed on the counterbore part 21, the front surface 41A of the arc-shaped member of the surface of the counterbore part 21 , 41B and the front surface center portion 33 of the susceptor body face each other while being separated from the back surface of the wafer W.
- the wafer W when the wafer W is placed on the spot facing portion 21 and when the wafer W is unloaded from the spot facing portion 21 (that is, the wafer W is transported).
- the susceptor body 30 and the arc-shaped members 40A and 40B are separated in the vertical direction, and the entire front surfaces 41A and 41B of the arc-shaped members raised by the lift pins 44 are in surface contact with only the outer peripheral portion of the back surface of the wafer W. It functions as a supporting surface to support. Therefore, it is possible to suppress the occurrence of deep wrinkles due to contact with the lift pins or the susceptor on the back surface and the chamfered portion of the wafer W.
- the “outer peripheral portion of the back surface of the wafer” means a region on the back surface of the wafer that is separated from the wafer center by 70% or more of the wafer radius.
- the “center portion of the back surface of the wafer” means an inner region of the outer peripheral portion of the back surface of the wafer, that is, a region less than 70% of the wafer radius from the wafer center.
- the central portion of the back surface has no contact with any member (not only point contact but also surface contact). ). Therefore, when the center part of the back surface of the manufactured epitaxial wafer is observed using a laser microscope, no wrinkles (contact wrinkles) having a depth of 0.3 ⁇ m or less are observed.
- the wafer W undergoes a high-temperature heat treatment, causing a phenomenon such as warping upward or downward. For this reason, if a contact flaw exists in the center of the back surface of the wafer W, slip dislocation may be easily generated starting from the flaw, but in the present embodiment, there is no such fear.
- the wafer W supported by the arc-shaped members 40A and 40B is supported at the center of the back surface of the wafer W by the wafer support 72 of the U-shaped transfer blade 70 inserted from the direction shown in FIG. It is transported outside.
- the arc-shaped members 40A and 40B are arranged so as not to interfere with the wafer support portion 72 of the transfer blade.
- the surface portions of the arc-shaped members 40A and 40B or the entire arc-shaped members 40A and 40B are preferably made of a soft material (glassy carbon). This is because the generation of scratches when supporting the back surface of the wafer W in surface contact can be suppressed.
- the bottoms of the recesses 31A and 31B of the susceptor body and the arc-shaped members 40A and 40B have a perforated structure. This is because hydrogen gas wrapping around the back surface of the wafer W can be promoted, and halo generation on the back surface of the wafer can be suppressed.
- the susceptor support shaft 50 supports the susceptor 20 from below in the chamber 10, and includes a main column 52, four arms 54, and four support pins 58.
- the main column 52 is disposed substantially coaxially with the center of the susceptor.
- the four arms 54 extend radially from the main pillar 52 below the peripheral edge of the susceptor 20, and have through-holes 56 penetrating in the vertical direction.
- the “periphery of the susceptor” means a region outside the susceptor radius by 80% or more from the susceptor center.
- the support pins 58 are respectively provided at the tips of the four arms 54 and directly support the susceptor 20.
- the support pin 58 supports the peripheral edge of the back surface of the susceptor.
- Four lift pins 44 are inserted through the four through holes 56, respectively.
- the susceptor support shaft 50 is preferably made of quartz, and particularly preferably made of synthetic quartz.
- the tip portion of the support pin 58 is preferably composed of the same silicon carbide as the susceptor 20.
- a lifting shaft 60 as a lifting mechanism defines a hollow that accommodates the main column 52 of the susceptor support shaft, and a main column 62 that shares the rotation axis with the main column 32, and this
- the four pillars 64 branch off at the leading ends of the main pillars 62, and the lower ends of the lift pins 44 are supported by the leading ends 66 of the pillars 64, respectively.
- the lifting shaft 60 is preferably made of quartz.
- the lift pin 44 can be moved up and down by the vertical shaft 60 moving vertically up and down along the main column 52 of the susceptor support shaft.
- the wafer W supported by the transfer blade 70 shown in FIG. 2C and loaded into the chamber 10 is temporarily placed on the front surfaces 41A and 41B of the arc-shaped members 40A and 40B lifted by the lift pins 44.
- the lift pin 44 is moved upward through the lift movement of the lift shaft 60 that supports these lower ends.
- the susceptor body 30 is moved to the position of the arcuate members 40A and 40B, and the wafer W is placed on the counterbore portion 21 of the susceptor 20. Thereafter, the wafer W is heated to a temperature of 1000 ° C. or more by the heating lamp 14, while a reactive gas is supplied from the gas supply port 15 into the chamber 10 to vapor-phase grow an epitaxial film having a predetermined thickness. Manufacture wafers.
- the susceptor support shaft 50 is rotated about the main column 52 as a rotation axis, thereby rotating the susceptor 20 and the wafer W thereon.
- the susceptor main body 30 is lowered by lowering the susceptor support shaft 50. This lowering is performed until the lift pins 44 are supported by the elevating shaft 60 and the arc-shaped members 40A and 40B are separated from the susceptor main body 30. Are supported by the surfaces 41A and 41B.
- the transfer blade 70 is introduced into the chamber 10, the lift pins 44 are lowered, and an epitaxial wafer is placed on the wafer support portion 72 of the transfer blade.
- the epitaxial wafer is transferred from the arcuate members 40A and 40B to the transfer blade 70.
- the epitaxial wafer is carried out of the chamber 10 together with the transfer blade 70.
- the entire front surfaces 41 ⁇ / b> A and 41 ⁇ / b> B of the arcuate member are opposed to the back surface of wafer W. That is, referring also to FIG. 2C, the whole of the recesses 31A and 31B and the whole of the arc-shaped members 40A and 40B are directly below the outer peripheral part of the wafer W and inside the edge part of the wafer. Located in.
- the front surface of the arc-shaped member 40 ⁇ / b> A is a horizontal plane 46 ⁇ / b> A positioned around the spot facing portion 21, and the wafer support that is positioned inside the horizontal plane 46 ⁇ / b> A and supports the rear peripheral edge of the wafer W by line contact.
- the surface 46B includes a vertical wall surface 46C continuous from the inner peripheral end of the wafer support surface 32A, and a horizontal surface 46D continuous from the vertical wall surface 46C and constituting a part of the bottom surface of the spot facing portion 21.
- the arc-shaped member 40 ⁇ / b> A is positioned so as to extend to the outer peripheral portion of the peripheral portion of the susceptor main body 30 and the edge portion of the wafer W. Therefore, at the time of vapor phase growth, the source gas comes into contact with the horizontal surface 46A and the front surface outer peripheral portion 32 of the susceptor body to grow an epitaxial film, and the epitaxial film is formed between the horizontal surface 46A and the front peripheral surface portion 32. In some cases, the horizontal separation portions are also connected. Thereafter, when the arc-shaped member 40A is relatively lifted from the susceptor body 30, the epitaxial film connected at the separation portion is broken, and dust is generated. This dust adheres to the surface of the manufactured epitaxial wafer and causes many defects.
- the entire arc-shaped members 40A and 40B are located directly below the outer peripheral portion of the wafer W and inside the edge portion of the wafer. For this reason, an epitaxial film does not grow in the horizontal direction separation part between the arc-shaped members 40A, 40B and the susceptor body 30, and as a result, dust caused by the epitaxial film is not generated.
- an epitaxial silicon wafer was manufactured according to the procedure described above.
- the clearance between the edge of the wafer and the end of the spot facing portion was 1.25 mm
- the horizontal distance between the outer end of the recess and the edge of the wafer was 2.25 mm.
- a boron-doped silicon wafer having a diameter of 300 mm was used as an epitaxial wafer substrate.
- a silicon wafer was introduced into the chamber and placed on the susceptor by the method described above. Subsequently, after hydrogen baking was performed at 1150 ° C. in a hydrogen gas atmosphere, a silicon epitaxial film was grown on the surface of the silicon wafer by 4 ⁇ m at 1150 ° C. to obtain an epitaxial silicon wafer.
- trichlorosilane gas was used as the source gas
- diborane gas was used as the dopant gas
- hydrogen gas was used as the carrier gas.
- the epitaxial silicon wafer was carried out of the chamber by the method described above.
- the back surface area corresponding to the position of the lift pin is observed in the DCO mode using a surface inspection device (KLA-Tencor: Surfscan SP-2), and the laser
- the area (pin mark intensity) of a region having a scattering intensity equal to or higher than the set value of reflection was measured, and wrinkles due to lift pins on the back surface of the epitaxial wafer were evaluated.
- both the comparative example and the invention example were 0 mm 2 , and no wrinkles caused by lift pins were confirmed on the back surface of the epitaxial wafer.
- the susceptor and epitaxial growth apparatus of the present invention do not generate deep wrinkles due to contact with lift pins or susceptors on the back surface and chamfered portion of the wafer, and can suppress dust generation from the susceptor. It can be suitably applied to the manufacture of wafers.
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Abstract
Description
(1)エピタキシャル成長装置内でウェーハを載置するためのサセプタであって、
前記サセプタのおもて面に、前記ウェーハが載置される座ぐり部が形成され、
前記サセプタは、サセプタ本体と、該サセプタ本体のおもて面の外周部に設けられた2以上の凹部にそれぞれ載置された弧状部材とを有し、
前記座ぐり部の底面が、前記弧状部材のおもて面の全体と、前記サセプタ本体のおもて面の一部とで構成され、
前記サセプタ本体には、前記2以上の各弧状部材の裏面を支持して前記2以上の各弧状部材を昇降させるリフトピンを挿通するための2以上の貫通孔が設けられ、
前記ウェーハを前記座ぐり部に載置する際、及び、前記ウェーハを前記座ぐり部から搬出する際に、前記リフトピンにより上昇される前記弧状部材のおもて面の全体が、前記ウェーハの裏面の外周部のみを面接触で支持する支持面として機能することを特徴とするサセプタ。
前記リフトピンの下端部を支持して前記リフトピンを昇降させる昇降機構と、を有するエピタキシャル成長装置。
図6及び図7に示すエピタキシャル成長装置100は、チャンバ10と、加熱ランプ14と、図1及び図2にも示すサセプタ20と、図5(A)にも示すサセプタサポートシャフト50と、図5(B)にも示す昇降シャフト60とを有する。
チャンバ10は、上部ドーム11、下部ドーム12及びドーム取付体13を含み、このチャンバ10がエピタキシャル膜形成室を区画する。チャンバ10には、その側面の対向する位置に反応ガスの供給及び排出を行うガス供給口15及びガス排出口16が設けられる。
加熱ランプ14は、チャンバ10の上側領域および下側領域に配置され、一般に、昇降温速度が速く、温度制御性に優れた、ハロゲンランプや赤外ランプが用いられる。
図1及び図2を参照して、サセプタ20の主要な構成を説明する。サセプタ20は、チャンバ10の内部でウェーハWを載置するための円盤状の部材である。サセプタ20は、カーボングラファイト(黒鉛)を母材とし、その表面を炭化ケイ素でコーティングしたものを使用することができる。図1(A)及び(B)を参照して、サセプタ20のおもて面には、ウェーハWが載置される座ぐり部21が形成されている。座ぐり部21の開口端における直径は、ウェーハWの直径を考慮して適宜設定すればよく、通常、ウェーハWの直径よりも1.0~2.0mm程度大きくする。
図5(A)を参照して、サセプタサポートシャフト50は、チャンバ10内でサセプタ20を下方から支持するものであり、主柱52と、4本のアーム54と、4本の支持ピン58とを有する。主柱52は、サセプタの中心とほぼ同軸上に配置される。4本のアーム54は、主柱52からサセプタ20の周縁部下方に放射状に延び、それぞれ鉛直方向に貫通する貫通孔56を有する。なお、本明細書において「サセプタの周縁部」とは、サセプタ中心からサセプタ半径の80%以上外側の領域を意味する。支持ピン58は、4本のアーム54の先端にそれぞれ設けられ、サセプタ20を直接支持する。すなわち、支持ピン58は、サセプタの裏面周縁部を支持する。4つの貫通孔56には、4本のリフトピン44がそれぞれ挿通される。サセプタサポートシャフト50は、石英で構成することが望ましく、特に合成石英で構成することが望ましい。ただし、支持ピン58の先端部分は、サセプタ20と同じ炭化ケイ素で構成することが好ましい。
図5(B)に示すように、昇降機構としての昇降シャフト60は、サセプタサポートシャフトの主柱52を収容する中空を区画し、この主柱32と回転軸を共有する主柱62と、この主柱62の先端で分岐する4本の支柱64とを有し、これら支柱64の先端部66でリフトピン44の下端部をそれぞれ支持する。昇降シャフト60は石英で構成されることが好ましい。昇降シャフト60が、サセプタサポートシャフトの主柱52に沿って鉛直方向上下に動くことにより、リフトピン44を昇降させることができる。
次に、チャンバ10内へのウェーハWの搬入、ウェーハWへのエピタキシャル膜の気相成長、及び製造されたエピタキシャルウェーハのチャンバ10外への搬出の一連の動作を、図6及び図7を適宜参照して説明する。
ここで本発明の特徴的構成である、弧状部材40A,40Bの位置について詳細に説明する。
図1~3に示すサセプタと、図6,7に示すエピタキシャル成長装置を用いて、上記した手順に従ってエピタキシャルシリコンウェーハを製造した。図3において、ウェーハのエッジと座ぐり部端部とのクリアランスは1.25mm、凹部の外側端部とウェーハのエッジとの水平方向距離は2.25mmとした。エピタキシャルウェーハの基板としては、ボロンドープされた直径300mmのシリコンウェーハを用いた。
図4に示すサセプタを用いた以外は発明例と同様にして、エピタキシャルシリコンウェーハを製造した。
図8に示す従来のエピタキシャル成長装置を用いて、エピタキシャルシリコンウェーハを製造した。
エピタキシャルウェーハの製造は、シリコンウェーハをチャンバ内に導入し、既述の方法でサセプタ上に載置した。続いて、水素ガス雰囲気下で1150℃で水素ベークを行った後、1150℃にて、シリコンウェーハの表面にシリコンエピタキシャル膜を4μm成長させてエピタキシャルシリコンウェーハを得た。ここで、原料ソースガスとしてはトリクロロシランガスを用い、また、ドーパントガスとしてジボランガス、キャリアガスとして水素ガスを用いた。その後、既述の方法で、エピタキシャルシリコンウェーハをチャンバ外へ搬出した。
発明例及び従来例で製造したエピタキシャルウェーハそれぞれについて、共焦点レーザー顕微鏡(倍率:1000倍)を用いて、支持部材(従来例ではリフトピン、発明例では弧状部材)の位置に対応する裏面領域を観察した。その結果を図9(A),(B)に示す。図9(A)から明らかなように、従来例では、リフトピンとの接触に起因すると推測される多数の傷が観察された。この視野中の全ての傷について、深さ(Peak-Vallay値)を測定したところ、大多数の傷では深さが0.5μmを超えていた。これに対し、図9(B)から明らかなように、発明例ではほとんど疵は観察されず、この視野中に観察された多少の凹凸の深さを測定したところ、いずれも0.5μm以下であった。つまり、発明例では、0.5μmを超えるような深い疵は全く観察されなかった。
発明例及び比較例で製造した各10枚のエピタキシャルウェーハについて、表面検査装置(KLA-Tencor社製:Surfscan SP-2)を用いて、DCOモード(Dark Field CompositeObliqueモード)でエピタキシャル膜表面を観察し、直径が0.25μm以上のLPD(Light Point Defect)の個数を調べた。この測定結果によって、発塵によるパーティクルの発生状況を評価することができる。その結果、比較例では20.1個/ウェーハ(標準偏差9.1)であったのに対して、発明例では6.4個/ウェーハ(標準偏差3.7)と、減少していた。これは、発明例ではサセプタからの発塵が抑制できたことを示している。
10 チャンバ
11 上部ドーム
12 下部ドーム
13 ドーム取付体
14 加熱ランプ
15 ガス供給口
16 ガス排出口
20 サセプタ
21 座ぐり部
30 サセプタ本体
31A,31B 凹部
32 サセプタ本体のおもて面外周部
32A ウェーハ支持面
32B 縦壁面
33 サセプタ本体のおもて面中心部
34A,34B 凹部の底面
35 貫通孔
40A,40B 弧状部材
41A,41B 弧状部材のおもて面
42A,42B 弧状部材の裏面
43A,43B 弧状部材の外周面
44 リフトピン
45A,45B 弧状部材の内周面
50 サセプタサポートシャフト
52 主柱
54 アーム
56 貫通孔
58 支持ピン
60 昇降シャフト
62 主柱
64 支柱
66 支柱の先端部
70 ウェーハ搬送用ブレード
72 ウェーハ支持部
W ウェーハ
Claims (6)
- エピタキシャル成長装置内でウェーハを載置するためのサセプタであって、
前記サセプタのおもて面に、前記ウェーハが載置される座ぐり部が形成され、
前記サセプタは、サセプタ本体と、該サセプタ本体のおもて面の外周部に設けられた2以上の凹部にそれぞれ載置された弧状部材とを有し、
前記座ぐり部の底面が、前記弧状部材のおもて面の全体と、前記サセプタ本体のおもて面の一部とで構成され、
前記サセプタ本体には、前記2以上の各弧状部材の裏面を支持して前記2以上の各弧状部材を昇降させるリフトピンを挿通するための2以上の貫通孔が設けられ、
前記ウェーハを前記座ぐり部に載置する際、及び、前記ウェーハを前記座ぐり部から搬出する際に、前記リフトピンにより上昇される前記弧状部材のおもて面の全体が、前記ウェーハの裏面の外周部のみを面接触で支持する支持面として機能することを特徴とするサセプタ。 - 前記弧状部材の数が2であり、おもて面視で略線対称に位置する請求項1に記載のサセプタ。
- 前記リフトピンが前記弧状部材に固定されている請求項1又は2に記載のサセプタ。
- 請求項1~3のいずれか一項に記載のサセプタと、
前記リフトピンの下端部を支持して前記リフトピンを昇降させる昇降機構と、を有するエピタキシャル成長装置。 - ウェーハ表面上にエピタキシャル層が形成されたエピタキシャルウェーハであって、前記エピタキシャルウェーハの裏面及び面取り部を、レーザー顕微鏡を用いて観察した場合に、深さ0.5μmを超える疵が観察されないエピタキシャルウェーハ。
- 前記エピタキシャルウェーハの裏面の中央部を、レーザー顕微鏡を用いて観察した場合に、深さ0.3μm以下の疵が観察されない、請求項5に記載のエピタキシャルウェーハ。
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KR102000676B1 (ko) | 2019-07-16 |
CN107851560B (zh) | 2021-11-12 |
US20180135172A1 (en) | 2018-05-17 |
CN107851560A (zh) | 2018-03-27 |
JPWO2016174860A1 (ja) | 2017-09-07 |
TWI615917B (zh) | 2018-02-21 |
JP6288371B2 (ja) | 2018-03-07 |
TW201703184A (zh) | 2017-01-16 |
KR20170122277A (ko) | 2017-11-03 |
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