WO2013180483A1 - 탄화규소 에피 웨이퍼 및 이의 제조 방법 - Google Patents
탄화규소 에피 웨이퍼 및 이의 제조 방법 Download PDFInfo
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- WO2013180483A1 WO2013180483A1 PCT/KR2013/004754 KR2013004754W WO2013180483A1 WO 2013180483 A1 WO2013180483 A1 WO 2013180483A1 KR 2013004754 W KR2013004754 W KR 2013004754W WO 2013180483 A1 WO2013180483 A1 WO 2013180483A1
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- WO
- WIPO (PCT)
- Prior art keywords
- wafer
- silicon carbide
- susceptor
- epi
- surface treatment
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 56
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 55
- 238000004519 manufacturing process Methods 0.000 title abstract description 25
- 230000007547 defect Effects 0.000 claims abstract description 34
- 230000003746 surface roughness Effects 0.000 claims description 24
- 239000002245 particle Substances 0.000 claims description 2
- 238000004381 surface treatment Methods 0.000 abstract description 35
- 238000010438 heat treatment Methods 0.000 abstract description 4
- 235000012431 wafers Nutrition 0.000 description 141
- 239000007789 gas Substances 0.000 description 31
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 19
- 229910052710 silicon Inorganic materials 0.000 description 16
- 239000010703 silicon Substances 0.000 description 16
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 9
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 9
- 230000006698 induction Effects 0.000 description 8
- 239000002994 raw material Substances 0.000 description 8
- 238000000151 deposition Methods 0.000 description 7
- 239000010408 film Substances 0.000 description 7
- 229910052739 hydrogen Inorganic materials 0.000 description 7
- 239000001257 hydrogen Substances 0.000 description 7
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 7
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 7
- 150000001875 compounds Chemical class 0.000 description 6
- 230000008021 deposition Effects 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 239000010409 thin film Substances 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 5
- 229910052799 carbon Inorganic materials 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 4
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 4
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 description 4
- 125000004429 atom Chemical group 0.000 description 4
- 238000005229 chemical vapour deposition Methods 0.000 description 4
- 229910052801 chlorine Inorganic materials 0.000 description 4
- 230000000052 comparative effect Effects 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000005055 methyl trichlorosilane Substances 0.000 description 4
- JLUFWMXJHAVVNN-UHFFFAOYSA-N methyltrichlorosilane Chemical compound C[Si](Cl)(Cl)Cl JLUFWMXJHAVVNN-UHFFFAOYSA-N 0.000 description 4
- 238000001878 scanning electron micrograph Methods 0.000 description 4
- 229910000077 silane Inorganic materials 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 2
- 239000000919 ceramic Substances 0.000 description 2
- SLLGVCUQYRMELA-UHFFFAOYSA-N chlorosilicon Chemical compound Cl[Si] SLLGVCUQYRMELA-UHFFFAOYSA-N 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000012776 electronic material Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 150000002431 hydrogen Chemical class 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000002360 preparation method Methods 0.000 description 2
- 239000001294 propane Substances 0.000 description 2
- 239000010453 quartz Substances 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 2
- 239000005052 trichlorosilane Substances 0.000 description 2
- -1 CH 3 Chemical class 0.000 description 1
- KZBUYRJDOAKODT-UHFFFAOYSA-N Chlorine Chemical compound ClCl KZBUYRJDOAKODT-UHFFFAOYSA-N 0.000 description 1
- 229910052581 Si3N4 Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000001000 micrograph Methods 0.000 description 1
- 150000004767 nitrides Chemical class 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 238000007788 roughening Methods 0.000 description 1
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- WFKWXMTUELFFGS-UHFFFAOYSA-N tungsten Chemical compound [W] WFKWXMTUELFFGS-UHFFFAOYSA-N 0.000 description 1
- 239000010937 tungsten Substances 0.000 description 1
- 229910052721 tungsten Inorganic materials 0.000 description 1
Images
Classifications
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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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/04—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer
- H01L21/18—Manufacture or treatment of semiconductor devices or of parts thereof the devices having potential barriers, e.g. a PN junction, depletion layer or carrier concentration layer the devices having semiconductor bodies comprising elements of Group IV of the Periodic Table or AIIIBV compounds with or without impurities, e.g. doping materials
- H01L21/20—Deposition of semiconductor materials on a substrate, e.g. epitaxial growth solid phase epitaxy
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L29/00—Semiconductor devices specially adapted for rectifying, amplifying, oscillating or switching and having potential barriers; Capacitors or resistors having potential barriers, e.g. a PN-junction depletion layer or carrier concentration layer; Details of semiconductor bodies or of electrodes thereof ; Multistep manufacturing processes therefor
- H01L29/02—Semiconductor bodies ; Multistep manufacturing processes therefor
- H01L29/12—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed
- H01L29/16—Semiconductor bodies ; Multistep manufacturing processes therefor characterised by the materials of which they are formed including, apart from doping materials or other impurities, only elements of Group IV of the Periodic Table
- H01L29/1608—Silicon carbide
-
- 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
- C23C16/30—Deposition of compounds, mixtures or solid solutions, e.g. borides, carbides, nitrides
- C23C16/32—Carbides
- C23C16/325—Silicon carbide
-
- 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
-
- 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
-
- 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
- H01L21/02—Manufacture or treatment of semiconductor devices or of parts thereof
- H01L21/02104—Forming layers
- H01L21/02365—Forming inorganic semiconducting materials on a substrate
- H01L21/02518—Deposited layers
- H01L21/02521—Materials
- H01L21/02524—Group 14 semiconducting materials
- H01L21/02529—Silicon carbide
Definitions
- Embodiments relate to silicon carbide epi wafers and methods of making the same.
- chemical vapor deposition is widely used in the art of forming various thin films on a substrate or a wafer.
- the chemical vapor deposition method is a deposition technique involving a chemical reaction, and forms a semiconductor thin film, an insulating film, or the like on the wafer surface by using a chemical reaction of a source material.
- Such chemical vapor deposition methods and deposition apparatuses have recently attracted attention as a very important technology among thin film formation technologies due to miniaturization of semiconductor devices, development of high efficiency, high power LEDs, and the like. It is currently used to deposit various thin films such as silicon films, oxide films, silicon nitride films or silicon oxynitride films, tungsten films and the like on a wafer.
- a reactive gas capable of reacting with the wafer must be introduced.
- a gaseous raw material such as silane (SiH 4 ), ethylene (C 2 H 4 ), which is a standard precursor, or a liquid raw material such as methyltrichlorosilane (MTS) is added thereto, and the raw material is heated to After the formation of intermediate compounds such as CH 3 , SiCl x, and the like, these intermediate compounds were introduced into the deposition unit and reacted with the wafer located in the susceptor to deposit a silicon carbide epi layer.
- Embodiments provide an epi wafer fabrication method and an epi wafer fabricated method capable of producing high quality silicon carbide epi wafers by reducing surface defects and / or surface roughness of the wafer.
- An epi wafer manufacturing method includes preparing a wafer in a susceptor; Surface treating the wafer; And growing an epitaxial layer on the wafer.
- An epi wafer includes a wafer; And an epitaxial layer formed on the wafer, wherein the surface defect of the wafer is 0.5 ea / cm 2.
- a surface treatment process for surface treating the wafer is first performed before the epi layer is grown.
- the surface treatment of the wafer may reduce surface defects of the wafer and improve surface roughness. That is, by the surface treatment process of the wafer, unstable silicon (Si) atoms present on the surface of the wafer can be controlled. That is, silicon present on the surface of the silicon carbide bulk wafer may form a constant protrusion on the surface of the wafer to roughen the surface of the silicon carbide wafer. Such surface roughness may cause defects on the silicon carbide wafer. Accordingly, the defect may be extended when the silicon carbide epitaxial layer is deposited on the silicon carbide wafer, thereby affecting the silicon carbide epitaxial layer.
- the epi wafer manufacturing method according to the embodiment is a surface defect that may occur when growing the epi layer on the wafer by controlling the unstable silicon atoms present on the surface of the wafer by the etching process using the surface treatment gas, Step bunching or surface roughness can be reduced. Accordingly.
- the surface defects, step bunching or surface roughness of the wafer may be reduced through the surface treatment of the wafer to manufacture a high quality silicon carbide epi wafer.
- the surface defects of the silicon carbide epitaxial wafer can be reduced to less than 0.5 ea / cm 2, and the surface roughness to less than 1 nm, so that the silicon carbide epitaxial wafer according to the embodiment can be used as an electronic material of high quality and high efficiency.
- FIG. 2 is an exploded perspective view illustrating a deposition apparatus according to an embodiment of the present invention
- FIG. 3 is a perspective view showing a deposition apparatus according to the embodiment
- FIG. 4 is a part of a cross-sectional view taken along line II ′ in FIG. 3;
- SEM scanning electron micrographs
- each layer, region, pattern, or structure may be “on” or “under” the substrate, each layer, region, pad, or pattern.
- Substrate formed in includes all formed directly or through another layer. Criteria for the top / bottom or bottom / bottom of each layer will be described with reference to the drawings.
- each layer (film), region, pattern, or structure may be modified for clarity and convenience of description, and thus do not necessarily reflect the actual size.
- FIGS. 2 to 4 are exploded perspective views, perspective views, and cross-sectional views of a susceptor for describing the epi wafer manufacturing method according to the embodiment. to be.
- an epitaxial wafer manufacturing method includes preparing a wafer in a susceptor (ST10); Surface treating the wafer (ST20); And growing an epitaxial layer on the wafer (ST30).
- the wafer In preparing the wafer in the susceptor (ST10), the wafer may be positioned in the susceptor located in the chamber.
- the wafer may be a silicon carbide wafer.
- the epi wafer manufacturing method according to the embodiment may be a silicon carbide epi wafer manufacturing method.
- the wafer is 4H-silicon carbide, with an off angle of 3 ° to 10 °.
- the off angle may be defined as an angle at which the wafer is inclined with respect to the (0001) Si plane and the (000-1) C plane.
- the surface of the wafer may be etched using a surface treatment gas.
- the surface treating step (ST20) may include introducing a surface treating gas into the susceptor; And heating the susceptor.
- the surface treatment gas introduced into the susceptor is a compound containing hydrogen (H) and chlorine (Cl).
- the surface treatment gas may be hydrogen chloride (HCl).
- the surface of the wafer may be etched using the hydrogen chloride to perform surface treatment.
- the embodiment is not limited thereto, and the surface of the wafer may be etched using various surface treatment gases including chlorine and hydrogen.
- the flow rate of the surface treatment gas may be about 100 ml / min or more.
- the flow rate of the surface treatment gas may be about 100 ml / min to about 500 ml / min. That is, the chlorine gas may be introduced into the susceptor at a flow rate of about 100 ml / min to about 500 ml / min.
- the flow rate range of the surface treatment gas is a range set in consideration of the degree of etching by the surface treatment of the wafer.
- the susceptor may be heated to heat the surface of the wafer.
- the heating temperature may be at least about 1500 °C temperature.
- the heating temperature of the susceptor may be about 1500 °C to about 1600 °C. That is, the etching process of the wafer surface by the surface treatment gas may be performed at about 1500 ° C to about 1600 ° C. More preferably, the surface treatment process may proceed for about 5 minutes in the temperature range of about 1500 °C to about 1600 °C.
- the pressure inside the susceptor may be about 50 mbar or more.
- the pressure inside the susceptor may be about 50 mbar to about 100 mbar.
- silicon carbide bulk wafers have irregularities formed on the surface of the wafer by the silicon present on the surface, thereby roughening the surface of the silicon carbide wafer. Such surface roughness may cause defects to be generated on the silicon carbide wafer, and thus, when the silicon carbide epitaxial layer is deposited on the silicon carbide wafer, the defects may be extended to affect the silicon carbide epitaxial layer. Can be.
- surface defects include droplets, triagle defects (or triangle defects), pit, wavey pit, and particles.
- the surface treatment process of the wafer mentioned in the embodiment of the present invention can reduce the surface defects of the wafer and improve the surface roughness. That is, during the surface treatment, the silicon carbide wafer is heated to 1500 ° C. to about 1600 ° C., and the pressure inside the susceptor is maintained at about 50 mbar to about 100 mbar, thereby preventing unstable silicon (Si) atoms present on the surface of the wafer. Can be controlled.
- the surface defects, step bunching or surface roughness of the wafer may be reduced through the surface treatment of the wafer to manufacture a high quality silicon carbide epi wafer.
- the epitaxial layer is grown on the surface-treated wafer.
- the epi layer may be a silicon carbide epi layer.
- the epitaxial layer may be deposited on the wafer through a deposition apparatus including a susceptor.
- FIGS. 2 to 4 are exploded perspective views, perspective views and cross-sectional views of the susceptor for explaining the epi wafer manufacturing method according to the embodiment.
- the deposition apparatus includes a chamber 10, a susceptor 20, a source gas line 40, a wafer holder 30, and an induction coil 50.
- the chamber 10 may have a cylindrical tube shape. Alternatively, the chamber 10 may have a rectangular box shape. The chamber 10 may accommodate the susceptor 20, the source gas line 40, and the wafer holder 30.
- both ends of the chamber 10 are hermetically sealed, and the chamber 10 may prevent inflow of external gas and maintain a degree of vacuum.
- the chamber 10 may include quartz having high mechanical strength and excellent chemical durability.
- the chamber 10 has improved heat resistance.
- the heat insulating part 60 may be further provided in the chamber 10.
- the heat insulating part 60 may perform a function of preserving heat in the chamber 10.
- Examples of the material used as the heat insulating part include nitride ceramics, carbide ceramics or graphite.
- the susceptor 20 is disposed in the chamber 10.
- the susceptor 20 receives the source gas line 40 and the wafer holder 30.
- the susceptor 20 accommodates a substrate such as the wafer (W).
- the reaction gas is introduced into the susceptor 20 through the source gas line 40.
- the susceptor 20 may include a susceptor upper plate 21, a susceptor lower plate 22, and susceptor side plates 23.
- the susceptor upper plate 21 and the susceptor lower plate 22 face each other.
- the susceptor 20 may be manufactured by placing the susceptor upper plate 21 and the susceptor lower plate 22 and attaching the susceptor side plates 23 to both sides thereof.
- a space for the gas passage may be made in the susceptor 20 of the rectangular parallelepiped.
- the susceptor 20 may include graphite having high heat resistance and easy processing to withstand conditions such as high temperature.
- the susceptor 20 may have a structure in which silicon carbide is coated on the graphite body.
- the susceptor 20 may be induction heated by itself.
- the fuel supplied to the susceptor 20, that is, the reaction gas may be decomposed into an intermediate compound by heat, and in this state, may be deposited on the wafer W or the like.
- the fuel may include a liquid, gaseous or solid raw material containing carbon and silicon.
- the liquid raw material may include methyl trichlorosilane (MTS) or trichlorosilane (TCS).
- the gas phase raw material may include silane (SiH 4 ), ethylene (C 2 H 4 ) and hydrogen chloride (HCl) or silane, propane (C 3 H 8 ) and hydrogen chloride.
- the carrier gas may further include hydrogen (H 2 ).
- the raw material is decomposed into radicals containing silicon, carbon or chlorine, and a silicon carbide epitaxial layer may be grown on the wafer (W). More specifically, the radical can be CH x ⁇ (1 ⁇ x ⁇ 4) or SiCl x ⁇ (1 ⁇ x ⁇ 4) including CH 3 , SiCl, SiCl 2 , SiHCl 2 , SiHCl 2 , etc. have.
- the ratio of carbon, silicon, chlorine and hydrogen contained in the intermediate compound are each adjusted constantly.
- the molar ratio of carbon and silicon is 0.7 to 1
- the molar ratio of silicon and hydrogen may be 0.03 to 0.45.
- the source gas line 40 may have a square tube shape.
- Examples of the material used for the source gas line 40 include quartz and the like.
- the wafer holder 30 is disposed in the susceptor 20.
- the wafer holder 30 may be disposed at the rear of the susceptor 20 based on the direction in which the source gas flows.
- the wafer holder 30 supports the wafer (W). Examples of the material used for the wafer holder 30 include silicon carbide or graphite.
- the induction coil 50 is disposed outside the chamber 10.
- the induction coil 50 may surround the outer circumferential surface of the chamber 10.
- the induction coil 50 may induce heat generation of the susceptor 20 through electromagnetic induction.
- the induction coil 50 may wind an outer circumferential surface of the chamber 10.
- the susceptor 20 may be heated to a temperature of about 1500 ° C. to about 1700 ° C. by the induction coil 50. That is, the susceptor 20 may be heated to the epitaxial growth temperature by the induction coil 50. Thereafter, at a temperature of 1500 ° C. to 1700 ° C., the source gas is decomposed into an intermediate compound, introduced into the susceptor, and injected into the wafer (W). By the radicals injected onto the wafer W, a silicon carbide epitaxial layer is formed on the wafer W.
- the silicon carbide epitaxial growth apparatus forms a thin film such as the epi layer on a substrate such as the wafer W, and the remaining gas is disposed at an end of the susceptor 20. Through, it can be discharged to the outside.
- the epi wafer manufacturing method according to the embodiment can reduce the surface defects and the surface roughness of the wafer by controlling the unstable silicon (Si) atoms present on the surface of the wafer by the wafer surface treatment process.
- the epi wafer manufacturing method according to the embodiment can produce a high quality silicon carbide epi wafer having a surface defect of 0.5 ea / cm 2 or less and surface roughness of 1.0 nm or less.
- the epi wafer manufacturing method includes a wafer; And an epitaxial layer formed on the wafer, wherein the surface defect of the wafer is 0.5 ea / cm 2, and the surface roughness of the wafer is 1.0 nm or less.
- the reaction was carried out at a temperature of about 1600 ° C to grow a silicon carbide epitaxial layer on the silicon carbide wafer, thereby producing a silicon carbide epitaxial wafer.
- a silicon carbide epitaxial wafer was manufactured in the same manner as in Example 1, except that the surface treatment process was not performed.
- the silicon carbide epitaxial wafer manufactured through the surface treatment process has lower surface defects and surface roughness than the silicon carbide epitaxial wafer without the surface treatment process.
- 5 to 8 are scanning electron microscope (SEM) micrographs of silicon carbide epitaxial wafers subjected to the surface treatment process
- FIG. 9 is a scanning electron micrograph of the silicon carbide epitaxial wafers without the surface treatment process.
- Figure 5 is an epi wafer surface-treated at a pressure of 50 mbar
- Figure 6 is 100 mbar
- Figure 7 is a hydrogen chloride gas at a flow rate of 200ml / min
- Figure 8 is a hydrogen chloride gas at a flow rate of 500ml / min
- the epi wafer was surface treated by adding.
- surface defects of the wafer may be reduced and surface roughness may be improved by the surface treatment process. That is, silicon present on the surface of the silicon carbide bulk wafer may form a constant protrusion on the surface of the wafer to roughen the surface of the silicon carbide wafer. Such surface roughness may cause defects to be generated on the silicon carbide wafer, and thus, when the silicon carbide epitaxial layer is deposited on the silicon carbide wafer, the defects may be extended to affect the silicon carbide epitaxial layer. Can be.
- the silicon carbide epitaxial wafer manufacturing method and silicon carbide epitaxial wafer according to the embodiment is the surface treatment
- the gas etching process surface defects, step bunching or surface roughness that may occur when growing an epitaxial layer on the wafer by controlling unstable silicon atoms present on the surface of the wafer can be reduced.
- the surface defects can be reduced to less than 0.5 ea / cm2, the surface roughness to less than 1nm, the epi wafer manufacturing method according to the embodiment can produce a high quality silicon carbide epi wafer, the epi according to the embodiment Wafers can be used as electronic materials of high quality and high efficiency.
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Abstract
Description
표면결함(ea/㎠) | 표면조도(㎚) | |
실시예 | 0.5 미만 | 1 미만 |
비교예 | 0.5 초과 | 1 초과 |
Claims (5)
- 웨이퍼; 및상기 웨이퍼 상에 형성되는 에피층을 포함하고,상기 웨이퍼의 표면 결함은 0.5 ea/㎠ 인 에피 웨이퍼.
- 제1항에 있어서,상기 표면 결함은 용적(droplet), 트라이앵글(triagle defect), 피트(pit), 웨이비 피트(wavy pit), 파티클(particle) 중 어느 하나인 에피 웨이퍼.
- 제 1항에 있어서,상기 웨이퍼의 표면 조도는 1㎚ 이하인 에피 웨이퍼.
- 제 1항에 있어서,상기 웨이퍼 또는 상기 에피층은 탄화규소를 포함하는 에피 웨이퍼.
- 제4항에 있어서,상기 웨이퍼는 4H 탄화규소이고 오프각이 3°~10°인 에피 웨이퍼.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
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US20150267320A1 (en) * | 2014-03-24 | 2015-09-24 | Mitsubishi Electric Corporation | Method for manufacturing silicon carbide semiconductor device |
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KR20130107001A (ko) * | 2012-03-21 | 2013-10-01 | 엘지이노텍 주식회사 | 증착 장치 |
KR101926678B1 (ko) * | 2012-05-31 | 2018-12-11 | 엘지이노텍 주식회사 | 탄화규소 에피 웨이퍼 및 이의 제조 방법 |
KR102383833B1 (ko) * | 2015-07-09 | 2022-04-06 | 주식회사 엘엑스세미콘 | 탄화규소 에피 웨이퍼 및 이의 제조 방법 |
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Also Published As
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US20150144964A1 (en) | 2015-05-28 |
KR101926694B1 (ko) | 2018-12-07 |
CN104428872A (zh) | 2015-03-18 |
KR20130133996A (ko) | 2013-12-10 |
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