JPWO2016174860A1 - 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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- 230000002093 peripheral effect Effects 0.000 claims abstract description 33
- 230000037303 wrinkles Effects 0.000 claims abstract description 19
- 239000000758 substrate Substances 0.000 claims description 3
- 239000000428 dust Substances 0.000 abstract description 11
- 235000012431 wafers Nutrition 0.000 description 132
- 239000010408 film Substances 0.000 description 15
- 239000007789 gas Substances 0.000 description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 12
- 229910052710 silicon Inorganic materials 0.000 description 12
- 239000010703 silicon Substances 0.000 description 12
- 238000001947 vapour-phase growth Methods 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 7
- 230000007547 defect Effects 0.000 description 7
- 238000000034 method Methods 0.000 description 7
- 238000010438 heat treatment Methods 0.000 description 6
- 238000004519 manufacturing process Methods 0.000 description 6
- 238000000926 separation method Methods 0.000 description 5
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 4
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 239000010453 quartz Substances 0.000 description 3
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 3
- 238000007599 discharging Methods 0.000 description 2
- 238000011156 evaluation Methods 0.000 description 2
- 229910002804 graphite Inorganic materials 0.000 description 2
- 239000010439 graphite Substances 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000012495 reaction gas Substances 0.000 description 2
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 2
- 229910010271 silicon carbide Inorganic materials 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000012159 carrier gas Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 229910021397 glassy carbon Inorganic materials 0.000 description 1
- 229910052736 halogen Inorganic materials 0.000 description 1
- 125000001475 halogen functional group Chemical group 0.000 description 1
- 150000002367 halogens Chemical class 0.000 description 1
- 239000001257 hydrogen Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000007779 soft material Substances 0.000 description 1
- 230000001629 suppression Effects 0.000 description 1
- 239000010409 thin film Substances 0.000 description 1
- ZDHXKXAHOVTTAH-UHFFFAOYSA-N trichlorosilane Chemical compound Cl[SiH](Cl)Cl ZDHXKXAHOVTTAH-UHFFFAOYSA-N 0.000 description 1
- 239000005052 trichlorosilane Substances 0.000 description 1
- 239000012808 vapor phase Substances 0.000 description 1
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- 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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- 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
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- 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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- 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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- 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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- H01L21/67115—Apparatus for thermal treatment mainly by radiation
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- 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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- 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
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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- 2016-04-22 KR KR1020177029628A patent/KR102000676B1/ko active IP Right Grant
- 2016-04-22 WO PCT/JP2016/002165 patent/WO2016174860A1/ja active Application Filing
- 2016-04-22 CN CN201680024186.1A patent/CN107851560B/zh active Active
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US20180135172A1 (en) | 2018-05-17 |
TW201703184A (zh) | 2017-01-16 |
KR20170122277A (ko) | 2017-11-03 |
TWI615917B (zh) | 2018-02-21 |
WO2016174860A1 (ja) | 2016-11-03 |
CN107851560A (zh) | 2018-03-27 |
CN107851560B (zh) | 2021-11-12 |
KR102000676B1 (ko) | 2019-07-16 |
JP6288371B2 (ja) | 2018-03-07 |
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