JP7026795B2 - 半導体ウェハの表側にエピタキシャル層を堆積させる方法およびその方法を実施するための装置 - Google Patents
半導体ウェハの表側にエピタキシャル層を堆積させる方法およびその方法を実施するための装置 Download PDFInfo
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- 239000004065 semiconductor Substances 0.000 title claims description 110
- 238000000151 deposition Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 title claims description 11
- 235000012431 wafers Nutrition 0.000 claims description 115
- 239000000463 material Substances 0.000 claims description 28
- 239000013078 crystal Substances 0.000 claims description 23
- 230000005855 radiation Effects 0.000 claims description 13
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 9
- 238000002834 transmittance Methods 0.000 claims description 9
- 238000001228 spectrum Methods 0.000 claims description 6
- 230000008021 deposition Effects 0.000 claims description 4
- 238000010438 heat treatment Methods 0.000 claims description 3
- 230000005540 biological transmission Effects 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000005229 chemical vapour deposition Methods 0.000 description 7
- 229910052710 silicon Inorganic materials 0.000 description 5
- 239000010703 silicon Substances 0.000 description 5
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 5
- 229910010271 silicon carbide Inorganic materials 0.000 description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 4
- 230000003028 elevating effect Effects 0.000 description 4
- 229910002804 graphite Inorganic materials 0.000 description 4
- 239000010439 graphite Substances 0.000 description 4
- VJBCNMFKFZIXHC-UHFFFAOYSA-N azanium;2-(4-methyl-5-oxo-4-propan-2-yl-1h-imidazol-2-yl)quinoline-3-carboxylate Chemical compound N.N1C(=O)C(C(C)C)(C)N=C1C1=NC2=CC=CC=C2C=C1C(O)=O VJBCNMFKFZIXHC-UHFFFAOYSA-N 0.000 description 2
- 239000013256 coordination polymer Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229910052732 germanium Inorganic materials 0.000 description 2
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 description 2
- 239000000155 melt Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000002019 doping agent Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
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- C30B25/00—Single-crystal growth by chemical reaction of reactive gases, e.g. chemical vapour-deposition growth
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Description
半導体ウェハの表側へのエピタキシャル層の堆積は、通常、CVD反応器、多くの場合は枚葉式反応器において、CVD(化学気相成長)によって行われる。一例として、US2014/0 251 208 A1が言及され、そこでは、そのようなCVD反応器が記載される。枚葉式反応器は、上部カバーと下部カバーとの間に反応チャンバを設け(ドーム)、反応チャンバ内ではサセプタが、サセプタ担持シャフトのサセプタ担持アームによってサセプタ支持ピン上で保持される。カバーの上下に配置されたランプアレイによる熱放射によってサセプタおよびその上に載置された半導体ウェハが加熱され、上部カバーに面する半導体ウェハの表側に成膜ガスが流される。
半導体ウェハを提供することと、
半導体ウェハをサセプタ上に配置することと、
半導体ウェハの表側および裏側に向けられる熱放射によって半導体ウェハを堆積温度まで加熱することと、
半導体ウェハの表側に堆積ガスを導くことと、
半導体ウェハの裏側に向けられる熱放射の一部の強度を選択的に低減させることとを備え、その結果、半導体ウェハの縁部の第1の部分領域、すなわち、単結晶材料の配向により半導体ウェハの均一な温度が与えられる隣接する第2の部分領域よりもエピタキシャル層の成長速度が速い第1の部分領域が、より弱く加熱される。
サセプタと、
サセプタ担持シャフトとサセプタ担持アームとを有する、サセプタを保持して回転させる装置と、
サセプタ担持アームによって保持され、通過する熱放射の強度を選択的に低減する、内側に向いた突起を有するリングとを備え、その結果、サセプタ上に載置された半導体ウェハの縁部の第1の部分領域、すなわち、単結晶材料の配向により半導体ウェハの均一な温度が与えられる隣接する第2の部分領域よりもエピタキシャル層の成長速度が速い第1の部分領域が、より弱く加熱される。
300mmの直径および表側の<100>-配向を有する単結晶シリコンからなる半導体ウェハを、枚葉式反応器内において、シリコンからなるエピタキシャル層で被覆した。半導体ウェハの一部(比較例)は、図4による装置において、リング9を設けずに、図1によるサセプタ上にある態様で被覆された。半導体ウェハの別の部分(実施例)は、同じ方法で、ただし図5による実施形態におけるリング9が図4に従って配置されて存在する状態で、被覆された。半導体ウェハおよびリングの相対位置は、熱放射の強度がリングの突起を通過する際に弱くなり、したがって、エピタキシャル層の成長速度が半導体ウェハの第1の部分領域において目標とされる態様で減少するように、選択された。その後、縁部から1mmの距離における被覆された半導体ウェハの厚みと対応する半導体ウェハの平均厚みとの差を、各場合において確認した。本発明によって製造される半導体ウェハの場合、この差は、従来製造される半導体ウェハの場合(図8)よりも有意に小さい(図9)。
1 サセプタ
2 サセプタリング
3 サセプタ基部
4 レッジ
5 半導体ウェハ
6 配向ノッチ
7 サセプタ担持シャフト
8 サセプタ担持アーム
9 リング
10 サセプタ支持ピン
11 穴
12 ウェハ昇降シャフト
13 ウェハ昇降ピン
14 突起
15 ウェブ
16 リングセグメント
17 突起の内側縁部
Claims (5)
- 単結晶材料で構成された半導体ウェハの表側にエピタキシャル層を堆積させる方法であって、
半導体ウェハを提供することと、
前記半導体ウェハをサセプタ上に配置することと、
前記半導体ウェハの表側および裏側に向けられる熱放射によって前記半導体ウェハを堆積温度まで加熱することと、
前記半導体ウェハの表側に堆積ガスを導くことと、
前記半導体ウェハの裏側に向けられる熱放射の一部の強度を選択的に低減させることとを備え、その結果、前記半導体ウェハの縁部に位置し、前記単結晶材料の配向により前記半導体ウェハの均一な温度が与えられる隣接する第2の部分領域よりもエピタキシャル層の成長速度が速い第1の部分領域が、より弱く加熱され、
サセプタ担持アームによって保持されるリングが前記サセプタの下に配置され、前記リングは、内側を向く突起を有し、前記突起は、各々、ウェブとリングセグメントを備え、前記リングセグメントは、スペクトルのIR範囲において低い透過率を有する材料からなり、開口角αとして表される周方向の幅が15°以上25°以下である、単結晶材料で構成された半導体ウェハの表側にエピタキシャル層を堆積させる方法。 - 単結晶材料からなる半導体ウェハの表側にエピタキシャル層を堆積させるための装置であって、
サセプタと、
サセプタ担持シャフトとサセプタ担持アームとを有する、前記サセプタを保持して回転させる装置と、
前記サセプタ担持アームによって保持され、通過する熱放射の強度を選択的に低減する、内側に向いた突起を有するリングとを備え、その結果、前記サセプタ上に載置された半導体ウェハの縁部に位置し、前記単結晶材料の配向により前記半導体ウェハの均一な温度が与えられる隣接する第2の部分領域よりもエピタキシャル層の成長速度が速い第1の部分領域が、より弱く加熱され、前記突起は、各々、ウェブとリングセグメントを備え、前記リングセグメントは、スペクトルのIR範囲において低い透過率を有する材料からなり、開口角αとして表される周方向の幅が15°以上25°以下である、単結晶材料からなる半導体ウェハの表側にエピタキシャル層を堆積させるための装置。 - 前記リングは石英ガラスからなる、請求項2に記載の装置。
- 隣接する前記突起までの距離が90°である4つの前記突起によって特徴付けられる、請求項2または請求項3に記載の装置。
- 隣接する前記突起までの距離が180°である2つの前記突起によって特徴付けられる、請求項2または請求項3に記載の装置。
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