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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- 229910000577 Silicon-germanium Inorganic materials 0.000 title claims abstract description 41
- 238000004519 manufacturing process Methods 0.000 title abstract description 5
- LEVVHYCKPQWKOP-UHFFFAOYSA-N [Si].[Ge] Chemical compound [Si].[Ge] LEVVHYCKPQWKOP-UHFFFAOYSA-N 0.000 title abstract description 3
- 230000005669 field effect Effects 0.000 title description 7
- 239000004065 semiconductor Substances 0.000 title description 5
- 229910044991 metal oxide Inorganic materials 0.000 title description 3
- 150000004706 metal oxides Chemical class 0.000 title description 3
- 229910052732 germanium Inorganic materials 0.000 claims abstract description 46
- GNPVGFCGXDBREM-UHFFFAOYSA-N germanium atom Chemical compound [Ge] GNPVGFCGXDBREM-UHFFFAOYSA-N 0.000 claims abstract description 46
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims abstract description 30
- 229910052710 silicon Inorganic materials 0.000 claims abstract description 30
- 239000010703 silicon Substances 0.000 claims abstract description 30
- 239000012212 insulator Substances 0.000 claims abstract description 18
- 238000000137 annealing Methods 0.000 claims abstract description 12
- 238000000034 method Methods 0.000 claims description 42
- 239000002019 doping agent Substances 0.000 claims description 25
- 238000009792 diffusion process Methods 0.000 claims description 19
- 230000001590 oxidative effect Effects 0.000 claims description 2
- 239000012535 impurity Substances 0.000 claims 1
- 238000007254 oxidation reaction Methods 0.000 abstract description 7
- 239000011810 insulating material Substances 0.000 abstract 1
- 235000012431 wafers Nutrition 0.000 description 10
- 238000002513 implantation Methods 0.000 description 8
- 239000000463 material Substances 0.000 description 7
- 150000004767 nitrides Chemical class 0.000 description 7
- 230000008901 benefit Effects 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 6
- 230000003647 oxidation Effects 0.000 description 6
- 125000006850 spacer group Chemical group 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 238000005530 etching Methods 0.000 description 4
- 125000005843 halogen group Chemical group 0.000 description 4
- 229910052751 metal Inorganic materials 0.000 description 4
- 239000002184 metal Substances 0.000 description 4
- 238000001020 plasma etching Methods 0.000 description 4
- 208000032750 Device leakage Diseases 0.000 description 3
- 229910052785 arsenic Inorganic materials 0.000 description 3
- RQNWIZPPADIBDY-UHFFFAOYSA-N arsenic atom Chemical compound [As] RQNWIZPPADIBDY-UHFFFAOYSA-N 0.000 description 3
- 239000013078 crystal Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 3
- 229920002120 photoresistant polymer Polymers 0.000 description 3
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 2
- 229910052796 boron Inorganic materials 0.000 description 2
- 230000000295 complement effect Effects 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000005468 ion implantation Methods 0.000 description 2
- 238000001465 metallisation Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 125000004429 atom Chemical group 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000000151 deposition Methods 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 229910052698 phosphorus Inorganic materials 0.000 description 1
- 239000011574 phosphorus Substances 0.000 description 1
- 238000010405 reoxidation reaction Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 238000001039 wet etching Methods 0.000 description 1
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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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JP2008515188A (ja) * | 2004-09-29 | 2008-05-08 | フリースケール セミコンダクター インコーポレイテッド | 歪みチャネル、及びヘテロ接合ソース/ドレインを有する半導体素子を形成する方法 |
JP2011044706A (ja) * | 2009-07-28 | 2011-03-03 | Taiwan Semiconductor Manufacturing Co Ltd | 高ゲルマニウム濃度のSiGeストレッサの形成方法 |
JP2014045208A (ja) * | 2009-07-28 | 2014-03-13 | Taiwan Semiconductor Manufactuaring Co Ltd | 集積回路のトランジスタ構造 |
US9660082B2 (en) | 2009-07-28 | 2017-05-23 | Taiwan Semiconductor Manufacturing Company, Ltd. | Integrated circuit transistor structure with high germanium concentration SiGe stressor |
JP2017147458A (ja) * | 2009-07-28 | 2017-08-24 | 台湾積體電路製造股▲ふん▼有限公司Taiwan Semiconductor Manufacturing Company,Ltd. | 集積回路のトランジスタ構造 |
US10693003B2 (en) | 2009-07-28 | 2020-06-23 | Taiwan Semiconductor Manufacturing Company, Ltd. | Integrated circuit transistor structure with high germanium concentration SiGe stressor |
WO2011030782A1 (ja) * | 2009-09-09 | 2011-03-17 | 学校法人神奈川大学 | 半導体素子構造の形成方法、及び半導体素子 |
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CN114514392A (zh) * | 2019-05-03 | 2022-05-17 | 泰普科英普罗有限责任公司 | 用于浮动阀座板的系统和方法 |
Also Published As
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JP5043314B2 (ja) | 2012-10-10 |
CN1716554A (zh) | 2006-01-04 |
US7288443B2 (en) | 2007-10-30 |
CN100444336C (zh) | 2008-12-17 |
US20050285192A1 (en) | 2005-12-29 |
TW200625460A (en) | 2006-07-16 |
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