JP5758829B2 - ボロン含有シリコン酸炭窒化膜の形成方法およびシリコン酸炭窒化膜の形成方法 - Google Patents
ボロン含有シリコン酸炭窒化膜の形成方法およびシリコン酸炭窒化膜の形成方法 Download PDFInfo
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- JP5758829B2 JP5758829B2 JP2012072419A JP2012072419A JP5758829B2 JP 5758829 B2 JP5758829 B2 JP 5758829B2 JP 2012072419 A JP2012072419 A JP 2012072419A JP 2012072419 A JP2012072419 A JP 2012072419A JP 5758829 B2 JP5758829 B2 JP 5758829B2
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title claims description 279
- 229910052710 silicon Inorganic materials 0.000 title claims description 279
- 239000010703 silicon Substances 0.000 title claims description 279
- 238000000034 method Methods 0.000 title claims description 104
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 title claims description 80
- 229910052796 boron Inorganic materials 0.000 title claims description 80
- 230000008569 process Effects 0.000 claims description 47
- 230000015572 biosynthetic process Effects 0.000 claims description 38
- 229910052581 Si3N4 Inorganic materials 0.000 claims description 37
- HQVNEWCFYHHQES-UHFFFAOYSA-N silicon nitride Chemical compound N12[Si]34N5[Si]62N3[Si]51N64 HQVNEWCFYHHQES-UHFFFAOYSA-N 0.000 claims description 37
- 230000003647 oxidation Effects 0.000 claims description 12
- 238000007254 oxidation reaction Methods 0.000 claims description 12
- 238000010030 laminating Methods 0.000 claims description 10
- 150000004767 nitrides Chemical class 0.000 claims description 9
- 238000003763 carbonization Methods 0.000 claims 4
- 239000007789 gas Substances 0.000 description 72
- PZNSFCLAULLKQX-UHFFFAOYSA-N Boron nitride Chemical compound N#B PZNSFCLAULLKQX-UHFFFAOYSA-N 0.000 description 41
- 229910052582 BN Inorganic materials 0.000 description 40
- 239000011261 inert gas Substances 0.000 description 31
- 235000012431 wafers Nutrition 0.000 description 25
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 23
- 239000001301 oxygen Substances 0.000 description 21
- 229910052760 oxygen Inorganic materials 0.000 description 21
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 20
- 238000001039 wet etching Methods 0.000 description 20
- 238000001312 dry etching Methods 0.000 description 19
- 239000010410 layer Substances 0.000 description 18
- 238000005121 nitriding Methods 0.000 description 16
- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 12
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 12
- 230000008021 deposition Effects 0.000 description 12
- 238000005530 etching Methods 0.000 description 12
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 11
- 229910052799 carbon Inorganic materials 0.000 description 11
- 229910001873 dinitrogen Inorganic materials 0.000 description 10
- 230000001965 increasing effect Effects 0.000 description 10
- 239000004065 semiconductor Substances 0.000 description 10
- KRHYYFGTRYWZRS-UHFFFAOYSA-N Fluorane Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 8
- 230000008901 benefit Effects 0.000 description 8
- 230000000052 comparative effect Effects 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000007246 mechanism Effects 0.000 description 7
- 230000001590 oxidative effect Effects 0.000 description 7
- 229910052814 silicon oxide Inorganic materials 0.000 description 7
- 229910021529 ammonia Inorganic materials 0.000 description 6
- 239000003795 chemical substances by application Substances 0.000 description 6
- 238000003860 storage Methods 0.000 description 6
- 239000000758 substrate Substances 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 5
- 239000007800 oxidant agent Substances 0.000 description 5
- 239000010453 quartz Substances 0.000 description 5
- 238000010000 carbonizing Methods 0.000 description 4
- MROCJMGDEKINLD-UHFFFAOYSA-N dichlorosilane Chemical compound Cl[SiH2]Cl MROCJMGDEKINLD-UHFFFAOYSA-N 0.000 description 4
- 239000006185 dispersion Substances 0.000 description 4
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 4
- 229910010271 silicon carbide Inorganic materials 0.000 description 4
- 230000006872 improvement Effects 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- CBENFWSGALASAD-UHFFFAOYSA-N Ozone Chemical compound [O-][O+]=O CBENFWSGALASAD-UHFFFAOYSA-N 0.000 description 2
- 229910004298 SiO 2 Inorganic materials 0.000 description 2
- 230000003197 catalytic effect Effects 0.000 description 2
- 238000009792 diffusion process Methods 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000007789 sealing Methods 0.000 description 2
- 125000006850 spacer group Chemical group 0.000 description 2
- 229910001220 stainless steel Inorganic materials 0.000 description 2
- 239000010935 stainless steel Substances 0.000 description 2
- FAQYAMRNWDIXMY-UHFFFAOYSA-N trichloroborane Chemical compound ClB(Cl)Cl FAQYAMRNWDIXMY-UHFFFAOYSA-N 0.000 description 2
- MYMOFIZGZYHOMD-UHFFFAOYSA-N Dioxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 1
- PPWPWBNSKBDSPK-UHFFFAOYSA-N [B].[C] Chemical compound [B].[C] PPWPWBNSKBDSPK-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000005256 carbonitriding Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000007809 chemical reaction catalyst Substances 0.000 description 1
- 229910001882 dioxygen Inorganic materials 0.000 description 1
- 230000003028 elevating effect Effects 0.000 description 1
- 239000011229 interlayer Substances 0.000 description 1
- 239000011553 magnetic fluid Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000007790 scraping Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000003466 welding Methods 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
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Description
図1はこの発明の第1の実施形態に係るボロン含有シリコン酸炭窒化膜の形成方法の一例を示す流れ図、図2A〜図2Gは第1の実施形態に係るボロン含有シリコン酸炭窒化膜の形成方法の一例における主要な工程を示す断面図である。
図4はボロン窒化膜の成膜シーケンスの一例を示す流れ図、図5はガス吐出のタイミングの一例を示すタイミングチャート、図6A〜図6Bはボロン窒化膜の成膜シーケンスの一例における主要な工程を示す断面図である。
ボロン原料ガス : 三塩化ボロン(BCl3)
ボロン原料ガス流量: 1.5〜400sccm
処 理 時 間 : 3〜60min
処 理 温 度 : 450〜630℃
処 理 圧 力 : 66.7〜1333Pa(0.5〜10Torr)
上記処理条件では、シリコンウエハ1の被処理面上に、膜厚約0.2〜1.0nmのボロン膜6が形成される。
窒化剤ガス流量: 1000〜10000sccm
処 理 時 間: 0.1〜3.0min
処 理 温 度: 450〜630℃
処 理 圧 力: 13.3〜666.5Pa(0.1〜5.0Torr)
ステップ12が終了したら、不活性ガスを用いて処理室内をパージし、処理室の内部の雰囲気を不活性ガス雰囲気、本例では窒素ガス雰囲気に置換する。ここまでで、ボロン窒化膜2の成膜シーケンスの1サイクルが終了する。
図7はシリコン炭窒化膜の成膜シーケンスの一例を示す流れ図、図8はガス吐出のタイミングの一例を示すタイミングチャート、図9A〜図9Cはシリコン炭窒化膜の成膜シーケンスの一例における主要な工程を示す断面図である。
シリコン原料ガス : ジクロロシラン(SiH2Cl2:DCS)
シリコン原料ガス流量: 500〜3000sccm
処 理 時 間 : 0.05〜1.0min
処 理 温 度 : 450〜630℃
処 理 圧 力 : 13.3〜1064Pa(0.1〜8.0Torr)
上記処理条件では、ボロン窒化膜2上に、膜厚約0.3〜1.0nmのシリコン膜7が形成される。
炭化剤ガス流量: 3000sccm
処 理 時 間: 0.5〜1.5min
(炭化剤ガス供給時間:0.05〜0.2min ホールド時間:0.2〜1.3min)
処 理 温 度: 450〜630℃
処 理 圧 力: 133〜665Pa(1.0〜5.0Torr)
ステップ22が終了したら、不活性ガスを用いて処理室内をパージし、処理室の内部の雰囲気を不活性ガス雰囲気、本例では窒素ガス雰囲気に置換する。
窒化剤ガス流量: 5000〜10000sccm
処 理 時 間: 0.2〜1.0min
処 理 温 度: 450〜630℃
処 理 圧 力: 13.3〜66.5Pa(0.1〜0.5Torr)
ステップ23が終了したら、不活性ガスを用いて処理室内をパージし、処理室の内部の雰囲気を不活性ガス雰囲気、本例では窒素ガス雰囲気に置換する。ここまでで、シリコン炭窒化膜3の成膜シーケンスの1サイクルが終了する。
図10はシリコン酸窒化膜の成膜シーケンスの一例を示す流れ図、図11はガス吐出のタイミングの一例を示すタイミングチャート、図12A〜図12Cはシリコン酸窒化膜の成膜シーケンスの一例における主要な工程を示す断面図である。
シリコン原料ガス : ジクロロシラン(SiH2Cl2:DCS)
シリコン原料ガス流量: 500〜3000sccm
処 理 時 間 : 0.05〜1.0min
処 理 温 度 : 450〜630℃
処 理 圧 力 : 13.3〜1064Pa(0.1〜8.0Torr)
上記処理条件では、シリコン炭窒化膜3上に、膜厚約0.3〜1.0nmのシリコン膜9が形成される。
酸化剤ガス流量: 1000〜10000sccm
処 理 時 間: 0.1〜1.0min
処 理 温 度: 450〜630℃
処 理 圧 力: 13.3〜133Pa(0.1〜1.0Torr)
ステップ32が終了したら、不活性ガスを用いて処理室内をパージし、処理室の内部の雰囲気を不活性ガス雰囲気、本例では窒素ガス雰囲気に置換する。
窒化剤ガス流量: 5000〜10000sccm
処 理 時 間: 0.2〜1.0min
処 理 温 度: 450〜630℃
処 理 圧 力: 133〜665Pa(0.1〜0.5Torr)
ステップ33が終了したら、不活性ガスを用いて処理室内をパージし、処理室の内部の雰囲気を不活性ガス雰囲気、本例では窒素ガス雰囲気に置換する。ここまでで、シリコン酸窒化膜4の成膜シーケンスの1サイクルが終了する。
図13はこの発明の第2の実施形態に係るボロン含有シリコン酸炭窒化膜の形成方法の一例を示す流れ図、図14A〜図14Iは第2の実施形態に係るボロン含有シリコン酸炭窒化膜の形成方法の一例における主要な工程を示す断面図である。
シリコン酸窒化膜4−1を形成する。ここまでで、ボロン含有シリコン酸炭窒化膜の成膜シーケンスの1サイクルが終了する。
エッチャント : 希フッ酸(H2O:HF=100:1)
処 理 時 間: 60sec
また、ドライエッチングの条件は次の通りである。
エッチャント : CHF3、CF4、O2の混合ガス
処 理 時 間: 5sec
次に、ステップ5における具体的な成膜シーケンスの一例を説明する。
図16はシリコン窒化膜の成膜シーケンスの一例を示す流れ図、図17はガス吐出のタイミングの一例を示すタイミングチャート、図18A〜図18Bはシリコン窒化膜の成膜シーケンスの一例における主要な工程を示す断面図である。
シリコン原料ガス : ジクロロシラン(SiH2Cl2:DCS)
シリコン原料ガス流量: 500〜3000sccm
処 理 時 間 : 0.05〜1.0min
処 理 温 度 : 450〜630℃
処 理 圧 力 : 13.3〜1064Pa(0.1〜8.0Torr)
上記処理条件では、シリコン炭窒化膜3上に、膜厚約0.3〜1.0nmのシリコン膜12が形成される。
窒化剤ガス流量: 1000〜10000sccm
処 理 時 間: 0.1〜3.0min
処 理 温 度: 450〜630℃
処 理 圧 力: 13.3〜666.5Pa(0.1〜5.0Torr)
ステップ52が終了したら、不活性ガスを用いて処理室内をパージし、処理室の内部の雰囲気を不活性ガス雰囲気、本例では窒素ガス雰囲気に置換する。ここまでで、シリコン窒化膜11の成膜シーケンスの1サイクルが終了する。
図19はこの発明の第3の実施形態に係るシリコン酸炭窒化膜の形成方法の一例を示す流れ図である。
第1の実施形態においては、ボロン含有シリコン酸炭窒化膜5を、ボロン窒化膜2、シリコン炭窒化膜3、及びシリコン酸窒化膜4を積層することにより形成する。
エッチャント : 希フッ酸(H2O:HF=100:1)
処 理 時 間: 60sec
また、ドライエッチングの条件は次の通りである。
エッチャント : CHF3、CF4、O2の混合ガス
処 理 時 間: 5sec
図20に示すように、シリコン炭窒化膜(SiCN膜)は、上記希フッ酸では、ほとんどエッチングされない。これに対して、上記実施形態のように意図的に酸素を導入してシリコン酸炭窒化膜とし、その酸素濃度を上げていくと、上記希フッ酸によってエッチングされやすくなっていく。つまり、シリコン酸炭窒化膜は、その酸素濃度が低いと、ウェットエッチング耐性が増す傾向が理解できる。
(1) 特に、ウェットエッチング耐性に優れたボロン含有シリコン酸炭窒化膜又はシリコン酸炭窒化膜
(2) 特に、ドライエッチング耐性に優れたシリコン酸炭窒化膜
(3) ウェットエッチング耐性およびドライエッチング耐性の双方ともが優れたシリコン酸炭窒化膜
を、それぞれ精度良く作り分けることができる、という利点も得ることができる。
第4の実施形態は、上記第1、第2の実施形態に係るボロン含有シリコン酸炭窒化膜の形成方法、又は第3の実施形態に係るシリコン酸炭窒化膜の形成方法を実施することが可能な成膜装置の一例に関する。
その他、この発明はその要旨を逸脱しない範囲で様々に変形することができる。
Claims (11)
- 下地上に、ボロン含有シリコン酸炭窒化膜を形成するボロン含有シリコン酸炭窒化膜の形成方法であって、
下地上にボロン含有膜を形成し、このボロン含有膜上にシリコン炭窒化膜とシリコン酸窒化膜とを積層してボロン含有シリコン酸炭窒化膜を形成することを特徴とするボロン含有シリコン酸炭窒化膜の形成方法。 - 前記ボロン含有膜の形成と、前記シリコン炭窒化膜の形成と、前記シリコン酸窒化膜の形成とを繰り返すことを特徴とする請求項1に記載のボロン含有シリコン酸炭窒化膜の形成方法。
- 前記シリコン炭窒化膜の形成が、シリコン膜の炭化工程および窒化工程を含み、
前記シリコン酸窒化膜の形成が、シリコン膜の酸化工程および窒化工程を含むことを特徴とする請求項1又は請求項2に記載のボロン含有シリコン酸炭窒化膜の形成方法。 - 前記シリコン炭窒化膜の形成において、前記シリコン膜の炭化工程および窒化工程を繰り返すことを特徴とする請求項3に記載のボロン含有シリコン酸炭窒化膜の形成方法。
- 前記シリコン酸窒化膜の形成において、前記シリコン膜の酸化工程および窒化工程を繰り返すことを特徴とする請求項3又は請求項4に記載のボロン含有シリコン酸炭窒化膜の形成方法。
- 前記シリコン炭窒化膜を形成した後、前記シリコン酸窒化膜を形成する前に、シリコン窒化膜を形成する工程を含むことを特徴とする請求項1から請求項5のいずれか一項に記載のボロン含有シリコン酸炭窒化膜の形成方法。
- 下地上に、シリコン酸炭窒化膜を形成するシリコン酸炭窒化膜の形成方法であって、
下地上に、シリコン炭窒化膜とシリコン窒化膜とシリコン酸窒化膜とを積層してシリコン酸炭窒化膜を形成することを特徴とするシリコン酸炭窒化膜の形成方法。 - 前記シリコン炭窒化膜の形成と、前記シリコン窒化膜の形成と、前記シリコン酸窒化膜の形成とを繰り返すことを特徴とする請求項7に記載のシリコン酸炭窒化膜の形成方法。
- 前記シリコン炭窒化膜の形成が、シリコン膜の炭化工程および窒化工程を含み、
前記シリコン酸窒化膜の形成が、シリコン膜の酸化工程および窒化工程を含むことを特徴とする請求項7又は請求項8に記載のシリコン酸炭窒化膜の形成方法。 - 前記シリコン炭窒化膜の形成において、前記シリコン膜の炭化工程および窒化工程を繰り返すことを特徴とする請求項9に記載のシリコン酸炭窒化膜の形成方法。
- 前記シリコン酸窒化膜の形成において、前記シリコン膜の酸化工程および窒化工程を繰り返すことを特徴とする請求項9又は請求項10に記載のシリコン酸炭窒化膜の形成方法。
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