JP6662250B2 - シリコンエピタキシャルウェーハの製造方法及び半導体デバイスの製造方法 - Google Patents
シリコンエピタキシャルウェーハの製造方法及び半導体デバイスの製造方法 Download PDFInfo
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 178
- 229910052710 silicon Inorganic materials 0.000 title claims description 178
- 239000010703 silicon Substances 0.000 title claims description 178
- 238000000034 method Methods 0.000 title claims description 54
- 238000004519 manufacturing process Methods 0.000 title claims description 35
- 239000004065 semiconductor Substances 0.000 title claims description 14
- 239000000758 substrate Substances 0.000 claims description 71
- 229910004298 SiO 2 Inorganic materials 0.000 claims description 42
- 230000015572 biosynthetic process Effects 0.000 claims description 26
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 claims description 17
- 229910052796 boron Inorganic materials 0.000 claims description 17
- 229910021420 polycrystalline silicon Inorganic materials 0.000 claims description 13
- 229920005591 polysilicon Polymers 0.000 claims description 12
- ATJFFYVFTNAWJD-UHFFFAOYSA-N Tin Chemical compound [Sn] ATJFFYVFTNAWJD-UHFFFAOYSA-N 0.000 claims description 3
- 229910052732 germanium Inorganic materials 0.000 claims description 3
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 235000012431 wafers Nutrition 0.000 description 149
- 239000010408 film Substances 0.000 description 117
- 238000005530 etching Methods 0.000 description 6
- 230000007547 defect Effects 0.000 description 5
- 239000010409 thin film Substances 0.000 description 4
- 238000010030 laminating Methods 0.000 description 2
- BOTDANWDWHJENH-UHFFFAOYSA-N Tetraethyl orthosilicate Chemical compound CCO[Si](OCC)(OCC)OCC BOTDANWDWHJENH-UHFFFAOYSA-N 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 238000004518 low pressure chemical vapour deposition Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
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Description
シリコンウェーハと、該シリコンウェーハ上に形成されたエピタキシャル層からなり、前記エピタキシャル層上に多層膜を形成するためのシリコンエピタキシャルウェーハの製造方法であって、
予め、試験用のシリコンウェーハを準備し、該試験用のシリコンウェーハの表面に前記多層膜を形成し、該多層膜を形成したシリコンウェーハの反り方向及び反り量(Warp)Wを測定する工程と、
前記測定した反り方向とは反対方向に前記測定した反り量Wを相殺する反りが形成されるように、デバイス形成用基板であるシリコンウェーハと該デバイス形成用基板であるシリコンウェーハ上に形成するエピタキシャル層の形成条件とを選択し、前記選択したデバイス形成用基板であるシリコンウェーハの前記多層膜を形成する表面上に前記選択したエピタキシャル層の形成条件で前記エピタキシャル層を形成する工程を含むシリコンエピタキシャルウェーハの製造方法を提供する。
W={(3×l2×hf)/(4×hs 2)}×{(rSi−rX)/rSi}×[X]/NS
l:前記デバイス形成用基板であるシリコンウェーハの直径、
hf:前記エピタキシャル層の厚さ、
hs:前記デバイス形成用基板であるシリコンウェーハの厚さ、
rSi:Siの共有結合半径、
rX:前記デバイス形成用基板であるシリコンウェーハにドープする元素の共有結合半径、
NS:Siの原子密度、
[X]:前記デバイス形成用基板であるシリコンウェーハにドープする元素のドープ濃度。
W={(3×l2×hf)/(4×hs 2)}×{(rSi−rX)/rSi}×[X]/NS
l:前記デバイス形成用基板であるシリコンウェーハの直径、
hf:前記エピタキシャル層の厚さ、
hs:前記デバイス形成用基板であるシリコンウェーハの厚さ、
rSi:Siの共有結合半径、
rX:前記デバイス形成用基板であるシリコンウェーハにドープする元素の共有結合半径、
NS:Siの原子密度、
[X]:前記デバイス形成用基板であるシリコンウェーハにドープする元素のドープ濃度。
まず、試験用のシリコンウェーハ(エピタキシャル層は形成されていない。)を用いて、3D−NANDデバイスにおける最初の積層工程である「SiO2+SiN」膜の積層工程(多層膜工程)での反り方向及び反り量を実測した。試験用のシリコンウェーハとしては、具体的には、Warpが非常に小さい(数μm)の直径300mmのp型で抵抗率が10Ω・cmのシリコンウェーハを用いた。
W={(3×l2×hf)/(4×hs 2)}×{(rSi−rX)/rSi}×[X]/NS
l:前記デバイス形成用基板であるシリコンウェーハの直径、
hf:前記エピタキシャル層の厚さ、
hs:前記デバイス形成用基板であるシリコンウェーハの厚さ、
rSi:Siの共有結合半径、
rX:前記デバイス形成用基板であるシリコンウェーハにドープする元素の共有結合半径、
NS:Siの原子密度、
[X]:前記デバイス形成用基板であるシリコンウェーハにドープする元素のドープ濃度。
エピタキシャル層の厚さ(hf)を10μmとし、基板ボロンドープ濃度([X])を5×1019cm−3とした以外は実施例1と同様にしてシリコンエピタキシャルウェーハを製造し、エピタキシャル層上に「SiO2+SiN」膜を形成した。形成した「SiO2+SiN」膜の組数とシリコンエピタキシャルウェーハのWarpの値との関係を図5に示した。
エピタキシャル層の厚さ(hf)を15μmとし、基板ボロンドープ濃度([X])を3×1019cm−3とした以外は実施例1と同様にしてシリコンエピタキシャルウェーハを製造し、エピタキシャル層上に「SiO2+SiN」膜を形成した。形成した「SiO2+SiN」膜の組数とシリコンエピタキシャルウェーハのWarpの値との関係を図5に示した。
2…シリコンウェーハ(シリコン基板)、 3…SiO2膜、
4…SiN膜又はポリシリコン膜、
5…「SiO2+SiN」膜又は「SiO2+ポリシリコン」膜、 6…多層膜。
Claims (4)
- シリコンウェーハと、該シリコンウェーハ上に形成されたエピタキシャル層からなり、前記エピタキシャル層上に多層膜を形成するためのシリコンエピタキシャルウェーハの製造方法であって、
予め、試験用のシリコンウェーハを準備し、該試験用のシリコンウェーハの表面に前記多層膜を形成し、該多層膜を形成したシリコンウェーハの反り方向及び反り量(Warp)Wを測定する工程と、
前記測定した反り方向とは反対方向に前記測定した反り量Wを相殺する反りが形成されるように、デバイス形成用基板であるシリコンウェーハと該デバイス形成用基板であるシリコンウェーハ上に形成するエピタキシャル層の形成条件とを選択し、前記選択したデバイス形成用基板であるシリコンウェーハの前記多層膜を形成する表面上に前記選択したエピタキシャル層の形成条件で前記エピタキシャル層を形成する工程を含み、
前記エピタキシャル層を形成する工程において、前記シリコンエピタキシャルウェーハに形成する反りの反り量が前記反り量W(ただし、前記多層膜を形成したシリコンウェーハが、前記多層膜側が凹形状となる凹形状の反りを形成する場合は、Wを正の値とし、前記多層膜を形成したシリコンウェーハが、前記多層膜側が凸形状となる凸形状の反りを形成する場合は、Wを負の値とする。)となるように、前記デバイス形成用基板であるシリコンウェーハの条件及び前記エピタキシャル層の形成条件を下記式より決定することを特徴とするシリコンエピタキシャルウェーハの製造方法。
W={(3×l 2 ×h f )/(4×h s 2 )}×{(r Si −r X )/r Si }×[X]/N S
l:前記デバイス形成用基板であるシリコンウェーハの直径、
h f :前記エピタキシャル層の厚さ、
h s :前記デバイス形成用基板であるシリコンウェーハの厚さ、
r Si :Siの共有結合半径、
r X :前記デバイス形成用基板であるシリコンウェーハにドープする元素の共有結合半径、
N S :Siの原子密度、
[X]:前記デバイス形成用基板であるシリコンウェーハにドープする元素のドープ濃度。 - 前記エピタキシャル層を形成する工程において、前記シリコンエピタキシャルウェーハに前記エピタキシャル層側が凹形状となる凹形状の反りを形成する場合は、前記デバイス形成用基板であるシリコンウェーハとして、ゲルマニウム又はスズがドープされたシリコンウェーハを用い、前記シリコンエピタキシャルウェーハに前記エピタキシャル層側が凸形状となる凸形状の反りを形成する場合は、前記デバイス形成用基板であるシリコンウェーハとして、リン又はボロンがドープされたシリコンウェーハを用いることを特徴とする請求項1に記載のシリコンエピタキシャルウェーハの製造方法。
- 前記多層膜を、SiO2膜とSiN膜とが交互に積層された多層膜又はSiO2膜とポリシリコン膜とが交互に積層された多層膜とすることを特徴とする請求項1又は請求項2に記載のシリコンエピタキシャルウェーハの製造方法。
- 請求項1から請求項3のいずれか一項に記載のシリコンエピタキシャルウェーハの製造方法で製造されたシリコンエピタキシャルウェーハの前記エピタキシャル層を形成した表面に前記多層膜を形成することを特徴とする半導体デバイスの製造方法。
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