JP7317079B2 - 薄膜形成方法及び装置 - Google Patents
薄膜形成方法及び装置 Download PDFInfo
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- JP7317079B2 JP7317079B2 JP2021133279A JP2021133279A JP7317079B2 JP 7317079 B2 JP7317079 B2 JP 7317079B2 JP 2021133279 A JP2021133279 A JP 2021133279A JP 2021133279 A JP2021133279 A JP 2021133279A JP 7317079 B2 JP7317079 B2 JP 7317079B2
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- thin film
- containing gas
- forming
- oxygen
- nitrogen
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- 239000010409 thin film Substances 0.000 title claims description 248
- 238000000034 method Methods 0.000 title claims description 136
- 239000007789 gas Substances 0.000 claims description 273
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 258
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 182
- 229910052710 silicon Inorganic materials 0.000 claims description 182
- 239000010703 silicon Substances 0.000 claims description 182
- 229910052757 nitrogen Inorganic materials 0.000 claims description 126
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 122
- 239000001301 oxygen Substances 0.000 claims description 122
- 229910052760 oxygen Inorganic materials 0.000 claims description 122
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 claims description 39
- 229910052814 silicon oxide Inorganic materials 0.000 claims description 38
- 238000000231 atomic layer deposition Methods 0.000 claims description 35
- 239000000758 substrate Substances 0.000 claims description 32
- GQPLMRYTRLFLPF-UHFFFAOYSA-N Nitrous Oxide Chemical compound [O-][N+]#N GQPLMRYTRLFLPF-UHFFFAOYSA-N 0.000 claims description 30
- MWUXSHHQAYIFBG-UHFFFAOYSA-N Nitric oxide Chemical compound O=[N] MWUXSHHQAYIFBG-UHFFFAOYSA-N 0.000 claims description 28
- 239000010408 film Substances 0.000 claims description 24
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 claims description 22
- 239000001257 hydrogen Substances 0.000 claims description 17
- 229910052739 hydrogen Inorganic materials 0.000 claims description 17
- 239000001272 nitrous oxide Substances 0.000 claims description 14
- 238000011065 in-situ storage Methods 0.000 claims description 10
- 229910021529 ammonia Inorganic materials 0.000 claims description 8
- 239000012298 atmosphere Substances 0.000 claims description 6
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- BLRPTPMANUNPDV-UHFFFAOYSA-N Silane Chemical compound [SiH4] BLRPTPMANUNPDV-UHFFFAOYSA-N 0.000 claims description 5
- 229910000077 silane Inorganic materials 0.000 claims description 5
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 claims description 4
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims description 4
- 229910000069 nitrogen hydride Inorganic materials 0.000 claims description 3
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 2
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 2
- UFHFLCQGNIYNRP-UHFFFAOYSA-N Hydrogen Chemical compound [H][H] UFHFLCQGNIYNRP-UHFFFAOYSA-N 0.000 claims 3
- 150000002431 hydrogen Chemical class 0.000 claims 1
- 238000010438 heat treatment Methods 0.000 description 17
- 238000006243 chemical reaction Methods 0.000 description 16
- 238000010926 purge Methods 0.000 description 16
- 125000004435 hydrogen atom Chemical class [H]* 0.000 description 13
- 230000004913 activation Effects 0.000 description 8
- 229910000577 Silicon-germanium Inorganic materials 0.000 description 6
- 238000010586 diagram Methods 0.000 description 6
- 238000005121 nitriding Methods 0.000 description 5
- 238000007254 oxidation reaction Methods 0.000 description 5
- 238000007740 vapor deposition Methods 0.000 description 5
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 description 4
- LXEXBJXDGVGRAR-UHFFFAOYSA-N trichloro(trichlorosilyl)silane Chemical compound Cl[Si](Cl)(Cl)[Si](Cl)(Cl)Cl LXEXBJXDGVGRAR-UHFFFAOYSA-N 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- 230000003247 decreasing effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 230000003647 oxidation Effects 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- QHAHOIWVGZZELU-UHFFFAOYSA-N trichloro(trichlorosilyloxy)silane Chemical compound Cl[Si](Cl)(Cl)O[Si](Cl)(Cl)Cl QHAHOIWVGZZELU-UHFFFAOYSA-N 0.000 description 3
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000000151 deposition Methods 0.000 description 2
- 230000008021 deposition Effects 0.000 description 2
- 239000012212 insulator Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000009832 plasma treatment Methods 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 description 1
- 238000007792 addition Methods 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000000280 densification Methods 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000005669 field effect Effects 0.000 description 1
- 239000003779 heat-resistant material Substances 0.000 description 1
- 239000011261 inert gas Substances 0.000 description 1
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- -1 nitrogen (NO) Chemical compound 0.000 description 1
- 239000012299 nitrogen atmosphere Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 1
- 229920005591 polysilicon Polymers 0.000 description 1
- 238000005086 pumping Methods 0.000 description 1
- 239000010453 quartz Substances 0.000 description 1
- 238000011160 research Methods 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 239000006200 vaporizer Substances 0.000 description 1
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- H01L21/02126—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC
- H01L21/0214—Forming insulating materials on a substrate characterised by the type of layer, e.g. type of material, porous/non-porous, pre-cursors, mixtures or laminates characterised by the material of the layer the material containing silicon the material containing Si, O, and at least one of H, N, C, F, or other non-metal elements, e.g. SiOC, SiOC:H or SiONC the material being a silicon oxynitride, e.g. SiON or SiON:H
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- H01L21/28194—Making the insulator on single crystalline silicon, e.g. using a liquid, i.e. chemical oxidation by deposition, e.g. evaporation, ALD, CVD, sputtering, laser deposition
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Description
Claims (18)
- 基板上に酸化シリコン薄膜を形成する酸化シリコン薄膜形成段階と、
前記酸化シリコン薄膜上に第1酸化窒化シリコン薄膜を形成し、前記第1酸化窒化シリコン薄膜内の窒素(N)含有量を調節することができる第1工程条件を含んで第1酸化窒化シリコン薄膜を形成する第1酸化窒化シリコン薄膜形成段階と、
前記第1酸化窒化シリコン薄膜上に第2酸化窒化シリコン薄膜を形成し、前記第2酸化窒化シリコン薄膜内の窒素(N)含有量を調節することができる第2工程条件を含んで第2酸化窒化シリコン薄膜を形成する第2酸化窒化シリコン薄膜形成段階と、を含み、
前記第1酸化窒化シリコン薄膜内の窒素(N)含有量が前記第2酸化窒化シリコン薄膜内の窒素(N)含有量よりも大きくなるように、前記第1工程条件と前記第2工程条件を調節し、
前記第1工程条件と前記第2工程条件は、酸素(O)含有ガスの種類であり、
前記第1酸化窒化シリコン薄膜形成段階に供給される第1酸素(O)含有ガスと前記第2酸化窒化シリコン薄膜形成段階に供給される第2酸素(O)含有ガスが互いに異なる種類のガスであることを特徴とする薄膜形成方法。 - 前記第1酸化窒化シリコン薄膜形成段階は、第1シリコン(Si)含有ガス供給段階、第1酸素(O)含有ガス供給段階及び第1窒素(N)含有ガス供給段階が少なくとも1回含まれた第1サイクルを反復して行う原子層堆積法(Atomic Layer Deposition,ALD)によって行われ、
前記第2酸化窒化シリコン薄膜形成段階は、第2シリコン(Si)含有ガス供給段階、第2酸素(O)含有ガス供給段階及び第2窒素(N)含有ガス供給段階が少なくとも1回含まれた第2サイクルを反復して行う原子層堆積法(Atomic Layer Deposition,ALD)によって行われることを特徴とする請求項1に記載の薄膜形成方法。 - 前記第1酸素(O)含有ガスは、亜酸化窒素(N2O)であり、
前記第2酸素(O)含有ガスは、酸素(O2)であることを特徴とする請求項2に記載の薄膜形成方法。 - 前記酸化シリコン薄膜形成段階と前記第1酸化窒化シリコン薄膜形成段階との間に、前記酸化シリコン薄膜上に第3酸化窒化シリコン薄膜を形成し、前記第3酸化窒化シリコン薄膜内の窒素(N)含有量を調節することができる第3工程条件を含んで第3酸化窒化シリコン薄膜を形成する第3酸化窒化シリコン薄膜形成段階と、をさらに含み、
前記第3酸化窒化シリコン薄膜内の窒素(N)含有量が前記第2酸化窒化シリコン薄膜内の窒素(N)含有量よりも小さくなるように、前記第1工程条件、前記第2工程条件及び前記第3工程条件を調節し、
前記第1酸化窒化シリコン薄膜形成段階は、第1シリコン(Si)含有ガス供給段階、第1酸素(O)含有ガス供給段階及び第1窒素(N)含有ガス供給段階が少なくとも1回含まれた第1サイクルを反復して行う原子層堆積法(Atomic Layer Deposition,ALD)によって行われ、
前記第2酸化窒化シリコン薄膜形成段階は、第2シリコン(Si)含有ガス供給段階、第2酸素(O)含有ガス供給段階及び第2窒素(N)含有ガス供給段階が少なくとも1回含まれた第2サイクルを反復して行う原子層堆積法(Atomic Layer Deposition,ALD)によって行われ、
前記第3酸化窒化シリコン薄膜形成段階は、第3シリコン(Si)含有ガス供給段階、第3酸素(O)含有ガス供給段階及び第3窒素(N)含有ガス供給段階が少なくとも1回含まれた第3サイクルを反復して行う原子層堆積法(Atomic Layer Deposition,ALD)によって行われることを特徴とする請求項1に記載の薄膜形成方法。 - 前記第1工程条件、前記第2工程条件及び前記第3工程条件は、酸素(O)含有ガスの種類であり、
前記第1酸素(O)含有ガスは、亜酸化窒素(N2O)であり、
前記第2酸素(O)含有ガスは、酸素(O2)であり、
前記第3酸素(O)含有ガスは、酸素(O2)と水素(H2)の混合ガス及び酸素(O2)のうち少なくとも一つであることを特徴とする請求項4に記載の薄膜形成方法。 - 前記第1酸化窒化シリコン薄膜内窒素(N)含有量は、20~40%であり、
前記第2酸化窒化シリコン薄膜内窒素(N)含有量は、10~20%であり、
前記第3酸化窒化シリコン薄膜内窒素(N)含有量は、10%以下となるように、前記第1工程条件、前記第2工程条件及び前記第3工程条件を調節することを特徴とする請求項4に記載の薄膜形成方法。 - 前記酸化シリコン薄膜形成段階は、原子層堆積法(Atomic Layer Deposition,ALD)によって行われることを特徴とする請求項4に記載の薄膜形成方法。
- 前記第2酸化窒化シリコン薄膜形成段階の後に、
前記薄膜を熱処理する段階をさらに含むことを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。 - 前記熱処理する段階は、
窒素(N2)、亜酸化窒素(N2O)、一酸化窒素(NO)、水素(H2)及びアンモニア(NH3)のうち少なくとも一つのガスの雰囲気で行うことを特徴とする請求項8に記載の薄膜形成方法。 - 前記酸化シリコン薄膜形成段階、前記第1酸化窒化シリコン薄膜形成段階、前記第2酸化窒化シリコン薄膜形成段階、前記第3酸化窒化シリコン薄膜形成段階及び前記熱処理する段階は、インサイチュ(in-situ)で行われることを特徴とする請求項8に記載の薄膜形成方法。
- 前記酸素(O)含有ガスは、
酸素(O2)、オゾン(O3)、亜酸化窒素(N2O)、一酸化窒素(NO)及び酸素(O2)と水素(H2)の混合ガスのうち少なくとも一つを含むことを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。 - 前記窒素(N)含有ガスは、アンモニア(NH3)を含むことを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。
- 前記シリコン(Si)含有ガスは、シラン系ガス及びシロキサン系ガスのうち少なくとも一つを含むことを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。
- 前記酸化シリコン薄膜形成段階の後に、
酸素(O2)と水素(H2)の混合ガスを用いて前記酸化シリコン薄膜を熱処理する段階をさらに含むことを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。 - 前記第1工程条件、前記第2工程条件及び前記第3工程条件は、一つのサイクルに含まれた酸素(O)含有ガス供給段階回数であり、
前記第1サイクルは、前記第1シリコン(Si)含有ガス供給段階と前記第1酸素(O)含有ガス供給段階をn(nは自然数)回反復した後に前記第1窒素(N)含有ガス供給段階を行い、
前記第2サイクルは、前記第2シリコン(Si)含有ガス供給段階と前記第2酸素(O)含有ガス供給段階をm(mは自然数)回反復した後に前記第2窒素(N)含有ガス供給段階を行い、
前記第3サイクルは、前記第3シリコン(Si)含有ガス供給段階と前記第3酸素(O)含有ガス供給段階をl(lは自然数)回反復した後に前記第3窒素(N)含有ガス供給段階を行い、
l>m>nであることを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。 - 前記第1工程条件、前記第2工程条件及び前記第3工程条件は、
酸素(O)含有ガス供給時間、供給される酸素(O)含有ガスの圧力、供給される酸素(O)含有ガスの流量、窒素(N)含有ガス供給時間、供給される窒素(N)含有ガスの圧力、供給される窒素(N)含有ガスの流量、一つのサイクルに含まれた窒素(N)含有ガス供給段階回数及び工程温度のうち少なくとも一つを調節し、
前記第1酸化窒化シリコン薄膜内の窒素(N)含有量が前記第2酸化窒化シリコン薄膜内の窒素(N)含有量よりも大きくなるようにし、前記第3酸化窒化シリコン薄膜内の窒素(N)含有量が前記第2酸化窒化シリコン薄膜内の窒素(N)含有量よりも小さくなるように、前記第1工程条件、前記第2工程条件及び前記第3工程条件を調節することを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。 - 前記薄膜は、ゲート酸化膜であることを特徴とする請求項4ないし7のいずれかに記載の薄膜形成方法。
- シリコン基板上に薄膜を形成する装置であって、
前記薄膜は、請求項4ないし7のいずれかに記載の薄膜形成方法で形成されることを特徴とする装置。
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JP2000091337A (ja) | 1998-09-09 | 2000-03-31 | Toshiba Microelectronics Corp | 半導体装置及びその製造方法 |
JP2001189314A (ja) | 1999-12-27 | 2001-07-10 | Toshiba Microelectronics Corp | 半導体装置の製造方法 |
JP2002151684A (ja) | 2000-11-09 | 2002-05-24 | Nec Corp | 半導体装置及びその製造方法 |
KR20030059406A (ko) | 2001-12-29 | 2003-07-10 | 주식회사 하이닉스반도체 | 반도체 소자의 게이트 전극 형성방법 |
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