JP2009516363A - スペーサレスfet及びデュアル・ライナ法による歪み強化を増加させる構造体及び方法 - Google Patents
スペーサレスfet及びデュアル・ライナ法による歪み強化を増加させる構造体及び方法 Download PDFInfo
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Abstract
【解決手段】 歪み強化がnFET及びpFETデバイスの両方に対して達成される半導体構造体及びそれを製造する方法を提供する。特に、本発明は、より強い歪み強化及び欠陥削減のための少なくとも1つのスペーサレスFETを提供する。少なくとも1つのスペーサレスFETは、pFET、nFET又はそれらの組合せとすることができるが、一般に、pFETはnFETよりも大きな幅を有するように製造されるので、スペーサレスpFETが特に好ましい。少なくとも1つのスペーサレスFETは、スペーサを有するFETを含んだ従来技術の構造体よりも、デバイス・チャネルにより接近した応力誘起ライナを設けることを可能にする。スペーサレスFETは、スペーサレスFETの下側に侵入しない、対応するシリサイド化ソース/ドレイン拡散コンタクトの抵抗に悪影響を与えることなく達成される。
【選択図】 図10
Description
半導体基板の表面上に配置され、絶縁領域によって互いに分離された、少なくとも1つのpFET及び少なくとも1つのnFETであって、そのnFET又はそのpFETの少なくとも1つはスペーサレスFETであり、各々のFETはチャネル領域を含む、少なくとも1つのpFET及び少なくとも1つのnFETと、
前記のスペーサレスFETのソース/ドレイン拡散領域の上に配置される再結晶化シリサイド・コンタクトであって、前記のスペーサレスFETの側壁の下に侵入しない、前記の再結晶化シリサイド・コンタクトと、
前記の少なくとも1つのpFETの周りに配置される圧縮応力誘起ライナ及び前記の少なくとも1つのnFETの周りに配置される引張応力誘起ライナであって、前記のスペーサレスFETの周りの少なくとも1つの応力誘起ライナは対応するチャネル領域から30nm又はそれ以内に配置される、圧縮応力誘起ライナ及び引張応力誘起ライナと
を備える半導体構造体を提供する。
好ましい実施形態においては、スペーサレスFETはpFETであり、圧縮応力誘起ライナはスペーサレスpFETのチャネル領域に接近して配置される。
少なくとも1つのnFET及び少なくとも1つのpFETを含んだ構造体の上に、第1応力誘起ライナとその上を覆うハード・マスクとを形成するステップであって、前記の第1応力誘起ライナは第1の応力型を有し、各々のFETはデバイス・チャネル、幅広の外側スペーサ及びシリサイド化ソース/ドレイン拡散コンタクトを含む、ステップと
前記のnFET又はpFETのうちの1つから、前記の上を覆うハード・マスク、前記の第1応力誘起ライナ、及び前記の幅広の外側スペーサの全部又は一部分を選択的に除去して少なくとも1つのスペーサレスFETを形成するステップであって、前記の第1応力誘起ライナ及び前記の幅広のスペーサを除去する間に前記の少なくとも1つのスペーサレスFETの前記のシリサイド化ソース/ドレイン拡散コンタクトがアモルファス化される、ステップと、
前記の構造体をアニールして、前記の少なくとも1つのスペーサレスFETの前記のアモルファス化されたシリサイド化ソース/ドレイン拡散コンタクトを再結晶化するステップと、
前記の第1応力型とは異なる第2応力型の第2応力誘起ライナを前記の少なくとも1つのスペーサレスFETに対して選択的に設けるステップであって、前記の第2応力誘起ライナは少なくとも1つのスペーサレスFETのチャネル領域から30nm又はそれ以内に配置される、ステップと
を含む。
少なくとも1つのスペーサレスnFETと少なくとも1つのスペーサレスpFETを含む構造体の上に第1応力誘起ライナ及びその上を覆うハード・マスクを形成するステップであって、前記の第1応力誘起ライナは第1応力型を有し、各々のFETはデバイス・チャネル及びシリサイド化ソース/ドレイン拡散コンタクトを含む、ステップと、
前記のnFET又はpFETのうちの1つから、前記の上を覆うハード・マスク及び前記の第1応力誘起ライナを選択的に除去するステップであって、前記の第1応力誘起ライナを前記のFETのうち1つから除去する間に、対応するシリサイド化ソース/ドレイン拡散コンタクトがアモルファス化される、ステップと、
前記の構造体をアニールして前記のアモルファス化されたシリサイド化ソース/ドレイン拡散コンタクトを再結晶化するステップと、
前記の第1応力型とは異なる第2応力型の第2応力誘起ライナを、第1応力誘起ライナが以前に除去されたスペーサレスFETにたいして選択的に設けるステップであって、前記の第1及び第2応力誘起ライナは、各々のスペーサレスFETの対応するチャネル領域から30nm又はそれ以内に配置される、ステップと
を含む。
12:半導体基板
12A:底部半導体層
12B:埋め込み絶縁層
12C:上部半導体層
14A:pFET
14B:nFET
16:絶縁領域
18:ゲート誘電体
20:ゲート導体
22:内側スペーサ
24:外側スペーサ
26、28:シリサイド・コンタクト
26’、28’:再結晶化シリサイド
29:デバイス・チャネル
30:第1応力誘起ライナ
32:ハード・マスク
34:第1のパターン付けされたフォトレジスト
36:第2応力誘起ライナ
38:第2のパターン付けされたフォトレジスト
40:相互接続誘電体
42:導電性材料
Claims (25)
- 半導体構造体であって、
半導体基板の表面上に配置され、絶縁領域によって互いに分離される、少なくとも1つのpFET及び少なくとも1つのnFETであって、前記nFET又は前記pFETの少なくとも1つはスペーサレスFETであり、各FETはチャネル領域を含む、少なくとも1つのpFET及び少なくとも1つのnFETと、
前記スペーサレスFETのソース/ドレイン拡散領域の上に配置される再結晶化シリサイド・コンタクトであって、前記スペーサレスFETの側壁の下に侵入しない前記再結晶化シリサイド・コンタクトと、
前記少なくとも1つのpFETの周りに配置される圧縮応力誘起ライナ及び前記少なくとも1つのnFETの周りに配置される引張応力誘起ライナであって、前記スペーサレスFETの周りの少なくとも1つの応力誘起ライナは、対応するチャネル領域から30nm又はそれ以内に配置される、前記圧縮及び引張応力誘起ライナと
を備える半導体構造体。 - 前記半導体基板は、半導体・オン・インシュレータ基板又はバルク基板である、請求項1に記載の半導体構造体。
- 前記少なくとも1つのスペーサレスFETはスペーサレスpFETである、請求項1に記載の半導体構造体。
- 前記少なくとも1つのスペーサレスFETは、スペーサレスnFET及びスペーサレスpFETである、請求項1に記載の半導体構造体。
- 前記少なくとも1つのスペーサレスFETは、幅広の外側スペーサをもたない、請求項1に記載の半導体構造体。
- 前記少なくとも1つのスペーサレスFETは、5nmから20nmまでの幅を有する狭い外側スペーサを含む、請求項1に記載の半導体構造体。
- 前記各FETは、ゲート誘電体の上に配置されるゲート導体を含む、請求項1に記載の半導体構造体。
- 前記ゲート導体は、ポリSi、ポリSiGe、金属、金属窒化物、金属シリサイド又はそれらの多層を含む、請求項7に記載の半導体構造体。
- 前記スペーサレスFETの前記ポリSi又はポリSiGeゲート導体の上部分は、再結晶化シリサイド・コンタクトを含む、請求項8に記載の半導体構造体。
- 半導体構造体であって、
半導体基板の表面上に配置され、絶縁領域によって互いに分離される、少なくとも1つのスペーサレスpFET及び少なくとも1つのnFETであって、各FETはチャネル領域を含む、少なくとも1つのスペーサレスpFET及び少なくとも1つのnFETと、
前記スペーサレスpFETのソース/ドレイン拡散領域の上に配置される再結晶化シリサイド・コンタクトであって、前記少なくとも1つのスペーサレスpFETの側壁の下に侵入しない前記再結晶化シリサイド・コンタクトと、
前記少なくとも1つのスペーサレスpFETの周りに配置される圧縮応力誘起ライナ、及び前記少なくとも1つのnFETの周りに配置される引張応力誘起ライナであって、前記スペーサレスpFETの周りの前記圧縮応力誘起ライナは、対応するチャネル領域から30nm又はそれ以内に配置される、前記圧縮及び引張応力誘起ライナと
を備える半導体構造体。 - 前記半導体基板は、半導体・オン・インシュレータ基板又はバルク基板である、請求項10に記載の半導体構造体。
- 前記少なくとも1つのスペーサレスpFETは、幅広の外側スペーサをもたない、請求項10に記載の半導体構造体。
- 前記少なくとも1つのスペーサレスpFETは、5nmから20nmまでの幅を有する狭い外側スペーサを含む、請求項10に記載の半導体構造体。
- 少なくとも前記スペーサレスpFETは、再結晶化シリサイド・コンタクトを備えた上部表面を有するゲート導体を含む、請求項10に記載の半導体構造。
- 半導体構造体を製造する方法であって、
少なくとも1つのnFET及び少なくとも1つのpFETを含む構造体の上に第1応力誘起ライナ及びその上を覆うハード・マスクを形成するステップであって、前記第1応力誘起ライナは第1の応力型を有し、各々のFETはデバイス・チャネル、幅広の外側スペーサ及びシリサイド化ソース/ドレイン拡散コンタクトを含む、ステップと、
前記nFET又はpFETのうちの1つから、前記上を覆うハード・マスク、前記第1応力誘起ライナ、及び前記幅広の外側スペーサの全部又は部分を選択的に除去して少なくとも1つのスペーサレスFETを形成するステップであって、前記第1応力誘起ライナ及び前記幅広のスペーサを除去する間に、前記少なくとも1つのスペーサレスFETの前記シリサイド化ソース/ドレイン拡散コンタクトがアモルファス化される、ステップと、
前記構造体をアニールして前記少なくとも1つのスペーサレスFETの前記アモルファス化されたシリサイド化ソース/ドレイン拡散コンタクトを再結晶化させるステップと、
前記第1の応力型とは異なる第2の応力型を有する第2応力誘起ライナを前記少なくとも1つのスペーサレスFETに対して選択的に設けるステップであって、前記第2応力誘起ライナは、前記少なくとも1つのスペーサレスFETのチャネル領域から30nm又はそれ以内に配置される、ステップと
を含む方法。 - 前記スペーサレスFETはpFETであり、前記第2応力誘起ライナは圧縮歪みを誘起するものである、請求項15に記載の方法。
- 前記スペーサレスFETはnFETであり、前記第2応力誘起ライナは引張歪みを誘起するものである、請求項15に記載の方法。
- 前記アニールするステップは、不活性雰囲気において350℃又はそれ以上の温度で実行する、請求項15に記載の方法。
- 前記アニールするステップは、さらに前記スペーサレスFETの上部ゲート導体表面をアモルファス化する、請求項15に記載の方法。
- 前記選択的に除去するステップは、前記ハード・マスクをエッチング停止マスクとして用いてエッチングするステップを含む、請求項15に記載の方法。
- 前記構造体は、半導体・オン・インシュレータ基板又はバルク半導体基板の上に配置される、請求項15に記載の方法。
- 前記FETの各々の間に絶縁領域を形成するステップをさらに含む、請求項21に記載の方法。
- 前記選択的に設けるステップは、前記第2応力誘起ライナを前記構造体の上に堆積させ、前記第1応力誘起ライナを含まない前記FETから前記第2応力誘起ライナをエッチングするステップを含む、請求項15に記載の方法。
- 前記シリサイド化ソース/ドレイン拡散コンタクトのうちの少なくとも幾つかに至るまで下に延びる、導電体で充填された開口部を有する、相互接続誘電体を形成するステップをさらに含む、請求項15に記載の方法。
- 半導体構造体を製造する方法であって、
少なくとも1つのスペーサレスnFET及び少なくとも1つのスペーサレスpFETを含む構造体の上に、第1応力誘起ライナ及びその上を覆うハード・マスクを形成するステップであって、前記第1応力誘起ライナは第1の応力型を有し、各々のFETはデバイス・チャネル及びシリサイド化ソース/ドレイン拡散コンタクトを含む、ステップと、
前記nFET又はpFETのうちの1つから、前記上を覆うハード・マスク及び前記第1応力誘起ライナを選択的に除去するステップであって、前記第1応力誘起ライナを前記FETのうちの1つから除去する間に、対応するシリサイド化ソース/ドレイン拡散コンタクトがアモルファス化される、ステップと、
前記構造体をアニールして前記アモルファス化されたシリサイド化ソース/ドレイン拡散コンタクトを再結晶化させるステップと、
前記第1応力誘起ライナが予め除去されたスペーサレスFETに、前記第1の応力型とは異なる第2の応力型の第2応力誘起ライナを選択的に設けるステップであって、前記第1及び第2応力誘起ライナは、前記スペーサレスFETの対応するチャネル領域から30nm又はそれ以内に配置される、ステップと
を含む方法。
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US20100187636A1 (en) | 2010-07-29 |
WO2007054403A1 (en) | 2007-05-18 |
TW200733384A (en) | 2007-09-01 |
US7709317B2 (en) | 2010-05-04 |
CN101283447A (zh) | 2008-10-08 |
CN101283447B (zh) | 2011-04-20 |
KR101027166B1 (ko) | 2011-04-05 |
KR20080071144A (ko) | 2008-08-01 |
EP1949435B1 (en) | 2013-11-20 |
JP4906868B2 (ja) | 2012-03-28 |
US20070108525A1 (en) | 2007-05-17 |
EP1949435A1 (en) | 2008-07-30 |
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