JP5689398B2 - 窒化シリコン膜の成膜方法及び成膜装置 - Google Patents
窒化シリコン膜の成膜方法及び成膜装置 Download PDFInfo
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Description
図1はこの発明の第1の実施形態に係る窒化シリコン膜の成膜方法の一例を示す流れ図、図2は図1に示す一例中の被処理体の断面例を示す断面図である。
DIPAS流量: 150sccm
処 理 時 間: 60sec
処 理 温 度: 450℃
処 理 圧 力: 532Pa(4Torr)
である。処理終了後、処理室内を、不活性ガスを用いてパージする(ステップ3)。本例では、不活性ガスとして窒素(N2)ガスを用いた。
NH3 流 量: 5000sccm
処 理 時 間: 25min
処 理 温 度: 処理の間に450℃から630℃へ上昇
処 理 圧 力: 66.7Pa(0.5Torr)
である。
図3はこの発明の第2の実施形態に係る窒化シリコン膜の成膜方法の一例を示す流れ図である。なお、一例中の被処理体の断面例は、図2A〜図2Dを代用する。
TDMAS流量: 150sccm
処 理 時 間: 15sec
処 理 温 度: 550℃
処 理 圧 力: 532Pa(4Torr)
である。処理終了後、処理室内を、不活性ガスを用いてパージする(ステップ13)。本例では、不活性ガスとして窒素ガスを用いた。
NH3 流 量: 5000sccm
処 理 時 間: 20sec
処 理 温 度: 550℃
処 理 圧 力: 53.2Pa(0.4Torr)
である。
次に、第1の実施形態、及び第2の実施形態のインキュベーション時間を、比較例と比較しながら説明する。
線II : y = 0.9265x − 14.181 …(2)
線III: y = 0.9159x − 21.846 …(3)
上記(1)、(2)、(3)式をy=0、即ち、窒化シリコン膜5の膜厚を“0”としたときのALDサイクルは次のようになる。
線II : 15サイクル(第2の実施形態)
線III: 24サイクル(比較例)
つまり、比較例ではALDサイクルを24回繰り返した後に窒化シリコン膜5が成長しだす。対して、第1の実施形態ではALDサイクルを19回繰り返した後に窒化シリコン膜5が成長しだし、第2の実施形態ではALDサイクルをさらに速い15回繰り返した後に窒化シリコン膜5が成長しだす。このように、第1、第2の実施形態は、双方ともが比較例よりも速い段階から窒化シリコン膜5が成長しだすことが明らかとなった。
第3の実施形態は、上記第1、第2の実施形態に係る窒化シリコン膜の成膜方法を実施することが可能な成膜装置の一例に関する。
第4の実施形態は、第1、又は第2の実施形態に係る窒化シリコン膜の成膜方法を利用した半導体装置の一成膜工程例に関する。
BTBAS(ビスターシャリブチルアミノシラン)
DMAS(ジメチルアミノシラン)
BDMAS(ビスジメチルアミノシラン)
DEAS(ジエチルアミノシラン)
BDEAS(ビスジエチルアミノシラン)、及び
DPAS(ジプロピルアミノシラン)
また、アミノシラン系ガスとしては、分子式中のシリコン(Si)が1つとなるものに限られるものではなく、分子式中のシリコンが2つとなるもの、例えば、ヘキサキスエチルアミノジシラン(C12H36N6Si2)なども用いることができる。
(1) (((R1R2)N)nSi2H6-n-m(R3)m …n:アミノ基の数 m:アルキル基の数
(2) ((R1)NH)nSi2H6-n-m(R3)m …n:アミノ基の数 m:アルキル基の数
(1)、(2)式において、
R1、R2、R3 = CH3、C2H5、C3H7
R1 = R2 = R3、または同じでなくても良い。
n = 1〜6の整数
m = 0、1〜5の整数
(3) (((R1R2)N)nSi2H6-n-m(Cl)m …n:アミノ基の数 m:塩素の数
(4) ((R1)NH)nSi2H6-n-m(Cl)m …n:アミノ基の数 m:塩素の数
(3)、(4)式において
R1、R2 = CH3、C2H5、C3H7
R1 = R2、または同じでなくても良い。
n = 1〜6の整数
m = 0、1〜5の整数
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 (7)
- (1) 被処理体を処理室内に搬入する工程と、
(2) 前記処理室内にアミノシラン系ガスを導入し、前記被処理体の表面上にシリコンを吸着させる工程と、
(3) 前記処理室内にアンモニアを含むガスを導入し、前記シリコンが吸着された前記被処理体の表面上にシード層を形成する工程と、
(4) 前記処理室内に窒化シリコンを成膜する成膜ガスを導入し、前記シード層上に窒化シリコン膜を形成する工程と
を具備し、
前記(3)の工程で、前記処理室内の温度を前記窒化シリコン膜の成膜温度に上昇させることを特徴とする窒化シリコン膜の成膜方法。 - 前記(4)工程が、シリコンを含むガスと窒化剤を含むガスとを交互に供給し、前記シード層上に、窒化シリコンを堆積させていく工程であることを特徴とする請求項1に記載の窒化シリコン膜の成膜方法。
- 前記(4)工程が、シリコンを含むガスと窒化剤を含むガスとを同時に供給し、前記シード層上に、窒化シリコンを堆積させていく工程であることを特徴とする請求項1に記載の窒化シリコン膜の成膜方法。
- 前記シリコンを含むガスが、シラン系ガスであることを特徴とする請求項2又は請求項3に記載の窒化シリコン膜の成膜方法。
- 前記被処理体の表面に、少なくともシリコンを主体とする領域と、金属を主体とする領域とが含まれていることを特徴とする請求項1から請求項4のいずれか一項に記載の窒化シリコン膜の成膜方法。
- 前記アミノシラン系ガスが、
BAS(ブチルアミノシラン)
BTBAS(ビスターシャリブチルアミノシラン)
DMAS(ジメチルアミノシラン)
BDMAS(ビスジメチルアミノシラン)
TDMAS(トリジメチルアミノシラン)
DEAS(ジエチルアミノシラン)
BDEAS(ビスジエチルアミノシラン)
DPAS(ジプロピルアミノシラン)
DIPAS(ジイソプロピルアミノシラン)
ヘキサキスエチルアミノジシラン
(1) (((R1R2)N)nSi2H6-n-m(R3)m
(2) ((R1)NH)nSi2H6-n-m(R3)m
(3) (((R1R2)N)nSi2H6-n-m(Cl)m
(4) ((R1)NH)nSi2H6-n-m(Cl)m
の少なくとも一つを含むガスから選ばれる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窒化シリコン膜の成膜方法。
(ただし、(1)、(2)式において、n:アミノ基の数、m:アルキル基の数、
(3)、(4)式において、n:アミノ基の数、m:塩素の数、
(1)〜(4)式において、n = 1〜6の整数、m = 0、1〜5の整数、
R1、R2、R3 = CH3、C2H5、C3H7 R1 = R2 = R3、または同じでなくても良い。) - 窒化シリコン膜を成膜する成膜装置であって、
被処理体を収容する処理室と、
前記処理室内に、アミノシラン系ガス、アンモニアを含むガス、及び窒化シリコンを成膜する成膜ガスを供給するガス供給機構と、を備え、
請求項1から請求項6のいずれか一項に記載の窒化シリコン膜の成膜方法を、前記処理室内において実行されるように構成されていることを特徴とする成膜装置。
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JP2011237988A JP5689398B2 (ja) | 2010-12-21 | 2011-10-28 | 窒化シリコン膜の成膜方法及び成膜装置 |
KR1020110138038A KR20120070516A (ko) | 2010-12-21 | 2011-12-20 | 질화 실리콘막의 성막 방법 및 성막 장치 |
TW100147335A TWI524425B (zh) | 2010-12-21 | 2011-12-20 | 氮化矽膜的成膜方法及成膜裝置 |
CN2011104339092A CN102560417A (zh) | 2010-12-21 | 2011-12-21 | 氮化硅膜的成膜方法和成膜装置 |
US13/332,691 US8753984B2 (en) | 2010-12-21 | 2011-12-21 | Method and apparatus for forming silicon nitride film |
KR1020150178053A KR20160002613A (ko) | 2010-12-21 | 2015-12-14 | 질화 실리콘막의 성막 방법 및 성막 장치 |
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US20120178264A1 (en) | 2012-07-12 |
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