JP5166458B2 - 半導体装置及びその製造方法 - Google Patents
半導体装置及びその製造方法 Download PDFInfo
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- JP5166458B2 JP5166458B2 JP2010012528A JP2010012528A JP5166458B2 JP 5166458 B2 JP5166458 B2 JP 5166458B2 JP 2010012528 A JP2010012528 A JP 2010012528A JP 2010012528 A JP2010012528 A JP 2010012528A JP 5166458 B2 JP5166458 B2 JP 5166458B2
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/60—Insulated-gate field-effect transistors [IGFET]
- H10D30/62—Fin field-effect transistors [FinFET]
- H10D30/6212—Fin field-effect transistors [FinFET] having fin-shaped semiconductor bodies having non-rectangular cross-sections
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D30/00—Field-effect transistors [FET]
- H10D30/01—Manufacture or treatment
- H10D30/021—Manufacture or treatment of FETs having insulated gates [IGFET]
- H10D30/024—Manufacture or treatment of FETs having insulated gates [IGFET] of fin field-effect transistors [FinFET]
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- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10D—INORGANIC ELECTRIC SEMICONDUCTOR DEVICES
- H10D62/00—Semiconductor bodies, or regions thereof, of devices having potential barriers
- H10D62/40—Crystalline structures
- H10D62/405—Orientations of crystalline planes
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- Insulated Gate Type Field-Effect Transistor (AREA)
- Metal-Oxide And Bipolar Metal-Oxide Semiconductor Integrated Circuits (AREA)
- Element Separation (AREA)
Description
図1(a)(b)は、本発明の第1の実施形態に係わるGe−FinFETの概略構造を説明するためのもので、図1(a)は上方から見た平面図、図1(b)は図1(a)のA−A’断面図である。
図11及び図12は、本発明の第2の実施形態に係わる半導体装置の製造工程を示す断面図である。なお、図2及び図3と同一部分には同一符号を付して、その詳しい説明は省略する。
なお、本発明は上述した各実施形態に限定されるものではない。Geフィン構造部は必ずしも単一組成のGeである必要はなく、SiGeバッファ層よりもGe組成の高いSi1-y Gey であっても良い。但し、SiGeバッファ層との十分なエッチング選択比を取るためには、SiGeバッファ層よりもGe組成が10%以上高い必要がある。
12…第1の素子分離絶縁膜
14,44…緩和SiGe層(Si1-x Gex バッファ層:第1の半導体層)
15,45…Ge層(第2の半導体層)
16,46…歪みGe層(Si1-y Gey フィン構造部)
18,48…第2の素子分離絶縁膜
19…貫通転位
21…Si基板
22,32…Ge層
23,33…SiO2 マスク
34…逆テーパ部
41…熱酸化膜
42…レジスト
51…ゲート絶縁膜
52…ゲート電極
Claims (7)
- Si基板の表面部に、一方向に長いストライプ領域を挟むように埋め込み形成され、且つ基板表面よりも高い位置まで形成された素子分離絶縁膜と、
前記基板のストライプ領域上に形成され、且つ最上面が前記素子分離絶縁膜の最上面よりも低い位置にあり、格子歪みが緩和されたSi1-xGex(0<x<1)バッファ層と、
前記バッファ層上に形成され、該層よりも前記一方向と直交する方向の幅が狭く基板面と垂直な(110)面を有し、前記バッファ層により格子歪が印加されたSi1-yGey(x<y≦1)フィン構造部と、
前記フィン構造部に形成されたpMOSトランジスタと、
を具備したことを特徴とする半導体装置。 - 前記バッファ層のGe組成xは0.7≦x≦0.9であり、前記フィン構造部のGe組成yはy≧0.9であり、且つy≧x+0.1であることを特徴とする請求項1記載の半導体装置。
- Si基板の表面部に、一方向に長い複数本のストライプ領域を挟むように埋め込み形成され、且つ基板表面よりも高い位置まで形成された素子分離絶縁膜と、
前記基板の一部のストライプ領域上に形成され、且つ最上面が前記素子分離絶縁膜の最上面よりも低い位置にあり、格子歪みが緩和されたSi1-xGex(0<x<1)バッファ層と、
前記バッファ層上に形成され、該層よりも前記一方向と直交する方向の幅が狭く基板面と垂直な(110)面を有し、前記バッファ層により格子歪が印加されたSi1-yGey(x<y≦1)からなる第1のフィン構造部と、
前記基板の残りのストライプ領域上に形成され、該領域よりも前記一方向と直交する方向の幅が狭く基板面と垂直な(110)面を有し、格子歪が緩和された第2のSi 1-y Ge y (x<y≦1)からなる第2のフィン構造部と、
前記第1のフィン構造部に形成されたpMOSトランジスタと、
前記第2のフィン構造部に形成されたnMOSトランジスタと、
を具備したことを特徴とする半導体装置。 - Si基板の表面部に一方向に長い複数本の溝を互いに平行に形成した後、これらの溝内に第1の素子分離絶縁膜を埋め込み形成する工程と、
前記第1の素子分離絶縁膜をマスクに用い、前記Si基板の表面部をエッチングする工程と、
前記Si基板をエッチングした領域にSi1-xGex(0<x<1)からなり、格子歪みが緩和された第1の半導体層と、Si1-yGey(x<y≦1)からなり、第1の半導体層により格子歪みが印加される第2の半導体層とを上記順に成長する工程と、
前記第1及び第2の半導体層の成長後に、前記第1の素子分離絶縁膜を除去する工程と、
前記第1の素子分離絶縁膜の除去後に、異方性のウェットエッチングによって前記第1の半導体層に対して前記第2の半導体層を選択的にエッチングすることにより、前記第2の半導体層の前記一方向と直交する方向の幅を狭めると共に、該層の側面に基板面と垂直な(110)面を露出させる工程と、
前記第2の半導体層のウェットエッチング後に、前記溝内に第2の素子分離絶縁膜を埋め込み形成する工程と、
前記第2の素子分離絶縁膜を埋め込み形成した後に、前記第2の半導体層にpMOSトランジスタを形成する工程と、
を含むことを特徴とする半導体装置の製造方法。 - 前記第2の半導体層をウェットエッチングする際に、水酸化アンモニウムと過酸化水素との混合溶液を用い、且つ過酸化水素に対する水酸化アンモニウムのモル濃度比を6〜552の範囲に設定したことを特徴とする請求項4記載の半導体装置の製造方法。
- 前記第2の半導体層をウェットエッチングする際に、塩化水素と過酸化水素との混合溶液を用い、且つ過酸化水素に対する塩化水素のモル濃度比を0.5〜24の範囲に設定したことを特徴とする請求項4記載の半導体装置の製造方法。
- 前記第2の半導体層をウェットエッチングする際に、塩化水素と過酸化水素とを含み過酸化水素に対する塩化水素のモル濃度比が0.5〜24の範囲に設定された第1の混合溶液を用いてエッチングした後、水酸化アンモニウムと過酸化水素とを含み過酸化水素に対する水酸化アンモニウムのモル濃度比が6〜552の範囲に設定された第2の混合溶液を用いてエッチングすることを特徴とする請求項4記載の半導体装置の製造方法。
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JP2010012528A JP5166458B2 (ja) | 2010-01-22 | 2010-01-22 | 半導体装置及びその製造方法 |
US12/888,674 US8242568B2 (en) | 2010-01-22 | 2010-09-23 | Semiconductor device and fabrication method thereof |
TW099132392A TWI423443B (zh) | 2010-01-22 | 2010-09-24 | 半導體裝置及其製造方法 |
US13/546,222 US8394690B2 (en) | 2010-01-22 | 2012-07-11 | Semiconductor device and fabrication method thereof |
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