JP7499343B2 - 炭化珪素基板上のバッファ層及びバッファ層の形成方法 - Google Patents
炭化珪素基板上のバッファ層及びバッファ層の形成方法 Download PDFInfo
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- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 title claims description 225
- 229910010271 silicon carbide Inorganic materials 0.000 title claims description 222
- 239000000758 substrate Substances 0.000 title claims description 55
- 238000000034 method Methods 0.000 title claims description 42
- 150000002500 ions Chemical class 0.000 claims description 86
- 239000007789 gas Substances 0.000 claims description 30
- 239000012535 impurity Substances 0.000 claims description 18
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 18
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 14
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 14
- 229910052799 carbon Inorganic materials 0.000 claims description 14
- 229910052710 silicon Inorganic materials 0.000 claims description 14
- 239000010703 silicon Substances 0.000 claims description 14
- -1 nitrogen ions Chemical class 0.000 claims description 13
- 229910052757 nitrogen Inorganic materials 0.000 claims description 11
- 229910052782 aluminium Inorganic materials 0.000 claims description 3
- 229910052796 boron Inorganic materials 0.000 claims description 3
- 229910052698 phosphorus Inorganic materials 0.000 claims description 3
- 239000011574 phosphorus Substances 0.000 claims description 3
- 230000007547 defect Effects 0.000 description 17
- 230000008569 process Effects 0.000 description 12
- 238000010586 diagram Methods 0.000 description 8
- 238000004381 surface treatment Methods 0.000 description 7
- 238000005229 chemical vapour deposition Methods 0.000 description 6
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 description 4
- 230000004888 barrier function Effects 0.000 description 4
- 239000001257 hydrogen Substances 0.000 description 4
- 229910052739 hydrogen Inorganic materials 0.000 description 4
- 229910021421 monocrystalline silicon Inorganic materials 0.000 description 3
- 230000001902 propagating effect Effects 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 2
- WTEOIRVLGSZEPR-UHFFFAOYSA-N boron trifluoride Chemical compound FB(F)F WTEOIRVLGSZEPR-UHFFFAOYSA-N 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 229910015900 BF3 Inorganic materials 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 1
- XYFCBTPGUUZFHI-UHFFFAOYSA-N Phosphine Chemical compound P XYFCBTPGUUZFHI-UHFFFAOYSA-N 0.000 description 1
- HSFWRNGVRCDJHI-UHFFFAOYSA-N alpha-acetylene Natural products C#C HSFWRNGVRCDJHI-UHFFFAOYSA-N 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000005137 deposition process Methods 0.000 description 1
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 1
- 230000005684 electric field Effects 0.000 description 1
- 125000002534 ethynyl group Chemical group [H]C#C* 0.000 description 1
- 229910000041 hydrogen chloride Inorganic materials 0.000 description 1
- IXCSERBJSXMMFS-UHFFFAOYSA-N hydrogen chloride Substances Cl.Cl IXCSERBJSXMMFS-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000000644 propagated effect Effects 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- FDNAPBUWERUEDA-UHFFFAOYSA-N silicon tetrachloride Chemical compound Cl[Si](Cl)(Cl)Cl FDNAPBUWERUEDA-UHFFFAOYSA-N 0.000 description 1
- 230000007480 spreading Effects 0.000 description 1
- 238000003892 spreading Methods 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
- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
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Description
例えば、3~6層の炭化珪素膜210を含み、上層の炭化珪素膜210よりも下層の他の全ての炭化珪素膜の上面に所定のイオンをドープしてもよい。もちろん、上層の炭化珪素膜210の上面に所定のイオンをドープしてもよい。バッファ層200中の炭化珪素膜210の数は、全部又は多くの貫通転位欠陥のブロッキングを可能にするように決定されてもよく、本発明はこの点に関して限定されないことが認識されるのであろう。
ここで、「低濃度ドープ」とは、炭化珪素エピタキシャル層300のイオン濃度が炭化珪素基板100のイオン濃度よりも低いことを意味する。炭化珪素エピタキシャル層300の厚さは、例えば、5μm以上1000μm以下である。
Claims (7)
- 炭化珪素基板の上にバッファ層を形成する方法であって、
第1の工程において、前記炭化珪素基板の表面に炭化珪素膜を形成し、
第2の工程において、前記炭化珪素膜の表面を所定のイオンで処理して、前記炭化珪素膜の上面に近い前記炭化珪素膜の上部ドープ領域が所定のイオンでドープされるようにし、これにより前記上部ドープ領域における所定のイオンの濃度を増加させるようにし、前記上部ドープ領域は10nm未満の厚さを有し、前記上部ドープ領域の厚さは、前記上部ドープ領域の下の同じ炭化珪素膜の残りの部分の厚さ未満であり、
第3の工程において、前記炭化珪素膜上に炭化珪素膜の別の層を形成し、
前記第2及び第3の工程を少なくとも1回繰り返して、前記バッファ層を構成する炭化珪素膜の少なくとも2つの層を連続的に形成し、
前記炭化珪素基板に対し、連続して前記第1乃至第3の工程を同一の処理チャンバにおいて繰り返し、
前記第1の工程は、炭素源ガス及びシリコン源ガスを前記処理チャンバに導入して前記炭化珪素膜を形成することを含み、
前記第2の工程は、前記炭素源ガス及び前記シリコン源ガスの導入を停止した後、前記処理チャンバに前記所定のイオンの源を導入して前記炭化珪素膜の上面をドープすることを含み、
前記第3の工程は、前記所定のイオンの源の導入を停止した後、前記シリコン源ガス及び前記炭素源ガスを再度導入して前記炭化珪素膜の別の層を成長させることを含む、方法。 - 前記所定のイオンは、n型不純物イオン又はp型不純物イオンであることを特徴とする請求項1に記載の炭化珪素基板の上にバッファ層を形成する方法。
- 前記n型不純物イオンは、窒素イオン又はリンイオンであり、
前記p型不純物イオンは、アルミニウムイオン又はホウ素イオンである、
請求項2に記載の炭化珪素基板の上にバッファ層を形成する方法。 - 前記炭化珪素膜の厚さは、10nm~200nmである、請求項1に記載の炭化珪素基板の上にバッファ層を形成する方法。
- 前記バッファ層の厚さは、200nm~1000nmである、請求項1に記載の炭化珪素基板の上にバッファ層を形成する方法。
- 前記第2及び第3の工程は、少なくとも2回以上繰り返されて、複数層の前記炭化珪素膜を形成する、請求項1に記載の炭化珪素基板の上にバッファ層を形成する方法。
- 炭化珪素基板を提供し、
前記請求項1~6のいずれか1項に記載の方法を用いて、連続して少なくとも2層の炭化珪素膜を前記炭化珪素基板の上に形成してバッファ層を形成し、
前記バッファ層の上にエピタキシャル層を形成する
ことを含む炭化珪素エピタキシャルウェーハを形成する方法。
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CN202110186694.2A CN112522781B (zh) | 2021-02-18 | 2021-02-18 | 碳化硅衬底上的缓冲层及其形成方法 |
CN202110186694.2 | 2021-02-18 | ||
PCT/CN2022/075930 WO2022174753A1 (zh) | 2021-02-18 | 2022-02-10 | 碳化硅衬底上的缓冲层及其形成方法 |
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JP2002329670A (ja) | 2001-04-27 | 2002-11-15 | Matsushita Electric Ind Co Ltd | 半導体装置及びその製造方法 |
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