JP2006019727A - 勾配付き組み込みシリコン−ゲルマニウムのソース−ドレイン及び/又は延長部をもつ、歪みp型mosfetの構造及びこれを製造する方法 - Google Patents
勾配付き組み込みシリコン−ゲルマニウムのソース−ドレイン及び/又は延長部をもつ、歪みp型mosfetの構造及びこれを製造する方法 Download PDFInfo
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Abstract
【解決手段】P型MOSFETは、ゲート110を絶縁体で封止し、ゲルマニウム含有層を側壁105の外側に成層させ、次いで、アニーリング又は酸化により、ゲルマニウムを絶縁体上シリコン層又はバルクシリコンの中に拡散させて、勾配付き組み込みシリコン−ゲルマニウムのソース−ドレイン40及び/又は延長部(geSiGe−SDE)を形成する。SOIデバイスにおいては、geSiGe−SDEは、水平方向の(ゲート誘電面に対して平行な)圧縮応力と、垂直方向の(該ゲート誘電面に対して直角の)引張り応力とをPMOSFETのチャネルに生成し、これによって、PMOSFET性能を向上させる構造を形成する。
【選択図】図1
Description
1)歪みシリコンは緩和SiGe上で成長されるものであり、したがって、デバイスの漏れを制御するのが困難である。
2)性能を向上させるために、ゲルマニウム濃度を30%以上にするという要求は、さらに、欠陥の密度を増加させる。
3)SiGeにおけるヒ素及びリンのようなドーパントの高い拡散率は、浅いp−n接合を形成するのを困難にする。サブミクロン又はディープ・サブミクロンのMOSFETにおいては、デバイスをスケーリングするのに浅い接合が要求される。
本発明の別の特徴は、ゲルマニウムによる垂直方向の完全な又は部分的な浸透によって、SOI層の中にSiGe領域を形成することである。
シリコンSOIウェハーで開始し、
ゲート酸化物(又はこれと等価のもの)を成長させ、
ポリゲート層を成層し(又は金属ゲートデバイスの金属を成層し)、
窒化物マスク層を成層し、
フォトレジスト、RIE窒化物、ポリ−Si(金属ゲートのためのRIE金属)及び酸化物を成層してパターン加工し、
薄い窒化物スペーサ(〜10ないし30nm)を形成し、
露出したシリコン上に、選択的にエピタキシャルSiGe(又はゲルマニウム)を形成し、
高温でアニールし、ゲルマニウムをSiデバイス層の中に拡散し、ゲルマニウム濃度を垂直方向及び水平方向に勾配付けするが、好ましくは、ゲルマニウムの濃度勾配形状がチャネル領域に入らないようにし、
ハロ注入、延長部注入、スペーサ形成、S/D注入、RTA、メタライゼーションを含んで、トランジスタを完成させる。
20:埋め込み絶縁体
30:SOI
40:ソース及びドレイン
100:電界効果トランジスタ
103:ゲート酸化物
105:側壁
107:ハードマスク
108:フォトレジスト
110:ゲート
130:エピタキシャル材料
Claims (25)
- PMOSFETを形成する方法であって、
埋め込み絶縁体層と前記埋め込み絶縁体層の上のSOI層とを有するSOIウェハーを準備し、
ゲート絶縁体層を前記SOI層の上方に形成し、
下側にチャネルを有するトランジスタゲートを前記SOI層の上に形成し、
絶縁体側壁を前記ゲートの第1の側面及び第2の側面に形成し、
ドーパントを含有するドーピング層を、前記SOI層上で前記絶縁体側壁に隣接してエピタキシャル形成し、
前記ドーパントを前記ドーピング層から前記SOI層の中に拡散させ、これによって、SOI表面に対して平行な水平方向の圧縮応力と、前記SOI表面に対して直角の垂直方向の引張り応力とを前記チャネルに生成し、
前記PMOSFETを完成させる、
ステップを含む方法。 - 前記拡散ステップが、高温アニールにより行われる請求項1に記載の方法。
- 前記ドーパントが前記SOI層の底面に到達するまで前記拡散ステップが継続される請求項1に記載の方法。
- 前記ドーパントが前記SOI層の底面に到達する前に前記拡散ステップが停止される請求項1に記載の方法。
- 前記ドーピング層がSiGeである請求項1に記載の方法。
- 前記ドーパント層が、原子番号20%より大きいゲルマニウム濃度をもつSiGeである請求項3に記載の方法。
- 熱酸化物の層を前記ドーピング層上に成長させ、これによって、該ドーピング層内の前記ドーパントを前記SOI層の中に拡散させるステップをさらに含む請求項1に記載の方法。
- 前記ドーパントを拡散させる前記ステップの後に、前記熱酸化物を除去するステップをさらに含む請求項7に記載の方法。
- 前記ドーパントが前記SOI層の底面に到達するまで前記拡散ステップが継続される請求項7に記載の方法。
- 前記ドーパントが前記SOI層の底面に到達する前に前記拡散ステップが停止される請求項7に記載の方法。
- 前記ドーピング層がSiGeである請求項7に記載の方法。
- 前記ドーピング層が、20%より大きいゲルマニウム濃度をもつSiGeである請求項11に記載の方法。
- PMOSFETを形成する方法であって、
バルクシリコンウェハーを準備し、
ゲート絶縁体層を前記バルクシリコンの上方に形成し、
下側にチャネルを有するトランジスタゲートを前記バルクシリコンの上に形成し、
絶縁体側壁を前記ゲートの第1の側面及び第2の側面に形成し、
ゲルマニウム又は不純物を含有するドーピング層を、前記バルクシリコン上で前記絶縁体側壁に隣接してエピタキシャル形成し、
ゲルマニウムを前記ゲルマニウムがドーピングされた層から前記バルクシリコンの中に拡散させ、これによって、(SOI表面に対して平行な)水平方向の圧縮応力と、(SOI表面に対して直角の)垂直方向の引張り応力とを前記チャネルに生成し、
前記PMOSFETを完成させる、
ステップを含む方法。 - 前記拡散ステップが、高温アニールにより行われる請求項13に記載の方法。
- 前記ドーピング層がSiGeである請求項13に記載の方法。
- 前記ドーパント層が、20%より大きいゲルマニウム濃度をもつSiGeである請求項13に記載の方法。
- 熱酸化物の層を前記ドーパント層上に成長させ、これによって、前記ドーパントを前記バルクシリコンの中に拡散させるステップをさらに含む請求項13に記載の方法。
- 前記ドーパントを拡散させる前記ステップの後に、前記熱酸化物を除去するステップをさらに含む請求項17に記載の方法。
- 前記ドーパント層がSiGeである請求項17に記載の方法。
- 前記ドーパント層が、20%より大きいゲルマニウム濃度をもつSiGeである請求項19に記載の方法。
- 埋め込み絶縁体層と前記埋め込み絶縁体層の上のSOI層とを有するSOIウェハーに形成された少なくとも1つのPMOSFETを含む集積回路であって、
前記少なくとも1つのPMOSFETが、前記SOI層の上方のゲート絶縁体と、該SOI層の上にあって下側にチャネルを有するトランジスタゲートとを有し、前記チャネルは、該チャネルにおいてSOI表面に対して平行な水平方向の圧縮応力と、前記SOI表面に対して直角の垂直方向の引張り応力とを有し、
前記SOI層が、前記水平方向の前記圧縮応力を生成するドーパントの濃度勾配を有し、前記ドーパントの前記濃度が、該SOI層の上面において最大値を有することを特徴とする集積回路。 - 前記ドーパントの濃度勾配が、前記SOI層の厚さより少ないドーパント深さまで延びる請求項21に記載の集積回路。
- 前記SOI層がシリコンであり、前記ドーパントがゲルマニウムである請求項22に記載の集積回路。
- 前記濃度勾配が高温アニールにより形成された請求項22に記載の集積回路。
- 前記濃度勾配が、前記SOI層の上に配設された成層ドーパント層を熱酸化することにより形成された請求項22に記載の集積回路。
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| US10/710244 | 2004-06-29 | ||
| US10/710,244 US7288443B2 (en) | 2004-06-29 | 2004-06-29 | Structures and methods for manufacturing p-type MOSFET with graded embedded silicon-germanium source-drain and/or extension |
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Also Published As
| Publication number | Publication date |
|---|---|
| JP5043314B2 (ja) | 2012-10-10 |
| CN100444336C (zh) | 2008-12-17 |
| CN1716554A (zh) | 2006-01-04 |
| US20050285192A1 (en) | 2005-12-29 |
| US7288443B2 (en) | 2007-10-30 |
| TW200625460A (en) | 2006-07-16 |
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