JP6153974B2 - シリコン及びシリコンゲルマニウムのナノワイヤ構造 - Google Patents
シリコン及びシリコンゲルマニウムのナノワイヤ構造 Download PDFInfo
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- JP6153974B2 JP6153974B2 JP2015145558A JP2015145558A JP6153974B2 JP 6153974 B2 JP6153974 B2 JP 6153974B2 JP 2015145558 A JP2015145558 A JP 2015145558A JP 2015145558 A JP2015145558 A JP 2015145558A JP 6153974 B2 JP6153974 B2 JP 6153974B2
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- H01L29/7848—Field effect transistors with field effect produced by an insulated gate means for exerting mechanical stress on the crystal lattice of the channel region, e.g. using a flexible substrate the means being located in the source/drain region, e.g. SiGe source and drain
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- H01L29/66—Types of semiconductor device ; Multistep manufacturing processes therefor
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- H01L29/786—Thin film transistors, i.e. transistors with a channel being at least partly a thin film
- H01L29/78606—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device
- H01L29/78618—Thin film transistors, i.e. transistors with a channel being at least partly a thin film with supplementary region or layer in the thin film or in the insulated bulk substrate supporting it for controlling or increasing the safety of the device characterised by the drain or the source properties, e.g. the doping structure, the composition, the sectional shape or the contact structure
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Description
Claims (21)
- 半導体デバイスを製造する方法であって:
バルク結晶シリコン基板上にエピタキシャルシリコンゲルマニウム(SiGe)層を形成し、
前記エピタキシャルSiGe層上にエピタキシャルシリコン層を形成し、
前記エピタキシャルSiGe層及び前記エピタキシャルシリコン層からフィン構造を形成し、前記フィン構造は、頂面と横方向反対側の側壁とを持ち、
前記フィン構造の前記頂面の上に及び前記横方向反対側の側壁に隣接して犠牲ゲート電極を形成して、前記フィン構造の一対のソース/ドレイン領域を定め、
前記犠牲ゲート電極の側壁に隣接して、前記フィン構造上に誘電体スペーサを形成し、
前記一対のソース/ドレイン領域から前記エピタキシャルシリコン層及び前記エピタキシャルSiGe層の双方の部分を除去し、
前記誘電体スペーサに隣接して、前記フィン構造用のエピタキシャルシリコンソース/ドレイン領域を形成し、
前記誘電体スペーサ同士の間から前記犠牲ゲート電極を除去して、前記誘電体スペーサ間の前記フィン構造の部分を露出させ、
前記誘電体スペーサ間の前記フィン構造の前記部分から前記エピタキシャルSiGe層を除去して、前記誘電体スペーサ間の前記フィン構造の前記部分内にエピタキシャルシリコンナノワイヤを形成し、
前記エピタキシャルシリコンナノワイヤ上にhigh−kゲート誘電体層を形成し、且つ
前記high−kゲート誘電体層上に、前記エピタキシャルシリコンナノワイヤの周りの金属ゲート電極を形成する、
ことを有する方法。 - 前記金属ゲート電極を形成することは、チタン層、タングステン層、タンタル層、及びアルミニウム層から成る群から選択された金属層を形成することを有する、請求項1に記載の方法。
- 前記金属ゲート電極を形成することは、チタン合金層、タングステン合金層、タンタル合金層、及びアルミニウム合金層から成る群から選択された金属合金層を形成することを有する、請求項1に記載の方法。
- 前記半導体デバイスはP型半導体デバイスである、請求項1に記載の方法。
- 前記半導体デバイスはN型半導体デバイスである、請求項1に記載の方法。
- 前記半導体デバイスは、ゲートオールアラウンド(GAA)型半導体デバイスである、請求項1に記載の方法。
- 前記誘電体スペーサ間の前記フィン構造の前記部分から前記エピタキシャルSiGe層を除去して前記エピタキシャルシリコンナノワイヤを形成することは、前記エピタキシャルシリコンナノワイヤの歪みシリコンチャネルを形成することを有する、請求項1に記載の方法。
- 前記エピタキシャルSiGe層及び前記エピタキシャルシリコン層から前記フィン構造を形成することは更に、前記フィン構造の隣に且つ前記フィン構造と並列に、1つ以上の更なるフィン構造を形成することを有する、請求項1に記載の方法。
- 前記フィン構造用のエピタキシャルシリコンソース/ドレイン領域を形成することは、前記フィン構造及び前記1つ以上の更なるフィン構造のための単一のソース領域を形成することと、前記フィン構造及び前記1つ以上の更なるフィン構造のための単一のドレイン領域を形成することとを有する、請求項8に記載の方法。
- 前記フィン構造用のエピタキシャルシリコンソース/ドレイン領域を形成することは、前記フィン構造用のファセット化されたエピタキシャルシリコンソース/ドレイン領域を形成することを有する、請求項1に記載の方法。
- ナノワイヤデバイスを製造する方法であって:
SOI基板上に、エピタキシャルシリコンゲルマニウム上のエピタキシャルシリコンの交互層を形成し、
前記交互層をパターニングして複数のフィン構造を形成し、
前記複数のフィン構造上にそれらを横切って複数のスペーサを形成し、
その後、前記複数のスペーサに隣接した前記基板のソース/ドレイン領域から前記フィン構造の一部を除去し、その後、前記ソース/ドレイン領域上にソース/ドレイン構造を形成し、前記ソース/ドレイン構造はp+シリコンゲルマニウムを有し、
その後、前記スペーサ同士の間に配置された前記フィン構造から前記エピタキシャルシリコンゲルマニウムの層を除去して、ギャップによって互いに分離されたシリコンナノワイヤ構造を形成し、前記SOI基板の底部酸化物が、1つのナノワイヤと1つのトライゲート構造とを形成するようにエッチングされる、
ことを有する方法。 - ナノワイヤデバイスを製造する方法であって:
SOI基板上に、エピタキシャルシリコンゲルマニウム上のエピタキシャルシリコンの交互層を形成し、
前記交互層をパターニングして複数のフィン構造を形成し、
前記複数のフィン構造上にそれらを横切って複数のスペーサを形成し、
その後、前記複数のスペーサに隣接した前記基板のソース/ドレイン領域から前記フィン構造の一部を除去し、その後、前記ソース/ドレイン領域上にソース/ドレイン構造を形成し、前記ソース/ドレイン構造はp+シリコンゲルマニウムを有し、
その後、前記スペーサ同士の間に配置された前記フィン構造から前記エピタキシャルシリコンゲルマニウムの層を除去して、ギャップによって互いに分離されたシリコンナノワイヤ構造を形成し、前記SOI基板の底部酸化物が、2つのナノワイヤを形成するようにエッチングされる、
ことを有する方法。 - ナノワイヤデバイスを製造する方法であって:
基板上に、エピタキシャルシリコンゲルマニウム上のエピタキシャルシリコンの交互層を形成し、
前記交互層をエッチングして複数のトレンチを形成することによって複数のフィン構造を形成し、
前記フィン構造にフィンスペーサを形成し、
その後、第2のトレンチエッチングを行って、前記フィン構造の底部フィン領域を露出させ、
その後、前記底部フィン領域を酸化し、
その後、前記複数のフィン構造上にそれらを横切って複数のスペーサを形成し、
その後、前記複数のスペーサに隣接した前記基板のソース/ドレイン領域から前記フィン構造の一部を除去し、その後、前記ソース/ドレイン領域上にソース/ドレイン構造を形成し、
その後、前記スペーサ同士の間に配置された前記フィン構造から前記シリコンの層を除去する
ことを有する方法。 - 底部ナノワイヤが前記酸化された底部フィン領域上に配置される、請求項13に記載の方法。
- ナノワイヤデバイスを製造する方法であって:
基板上に、エピタキシャルシリコンゲルマニウム上のエピタキシャルシリコンの交互層を形成し、
前記交互層をエッチングして複数のトレンチを形成することによって複数のフィン構造を形成し、
前記トレンチ内に酸化物を形成し、
その後、前記フィン構造にフィンスペーサを形成し、
その後、底部フィン領域を酸化し、
その後、前記複数のフィン構造上にそれらを横切って複数のスペーサを形成し、
その後、前記複数のスペーサに隣接した前記基板のソース/ドレイン領域から前記フィン構造の一部を除去し、その後、前記ソース/ドレイン領域上にソース/ドレイン構造を形成し、
その後、前記スペーサ同士の間に配置された前記フィン構造から前記エピタキシャルシリコンの層を除去する
ことを有する方法。 - 底部ナノワイヤが前記酸化された底部フィン領域上に配置される、請求項15に記載の方法。
- ナノワイヤデバイスを製造する方法であって:
基板上に、エピタキシャルシリコンゲルマニウム材料上のエピタキシャルシリコン材料の交互層を形成し、
前記交互層をエッチングして複数のトレンチを形成することによって複数のフィン構造を形成し、
前記複数のフィン構造上にそれらを横切って複数のスペーサを形成し、
その後、前記基板のソース/ドレイン領域から前記フィン構造の一部を除去し、
その後、前記複数のスペーサに隣接した前記ソース/ドレイン領域上にソース/ドレイン構造を形成し、
その後、前記スペーサ同士の間に配置された前記フィン構造から前記エピタキシャルシリコンの層及び前記エピタキシャルシリコンゲルマニウムの層のうちの一方を除去し、
その後、前記フィン構造に隣接する前記スペーサ内の空隙を第2のスペーサで充填し、前記スペーサ内の前記空隙は前記スペーサのゲート側で充填される、
ことを有する方法。 - 前記第2のスペーサの材料はlow−k材料を有する、請求項17に記載の方法。
- ナノワイヤデバイスを製造する方法であって:
<111>チャネルを有する(110)基板上に、エピタキシャルシリコンゲルマニウム材料上のエピタキシャルシリコン材料の交互層を形成し、
前記交互層をエッチングして複数のトレンチを形成することによって複数のフィン構造を形成し、
前記複数のフィン構造上にそれらを横切って複数のスペーサを形成し、
その後、前記複数のスペーサに隣接した前記基板のソース/ドレイン領域から前記フィン構造の一部を除去し、その後、前記ソース/ドレイン領域上にソース/ドレイン構造を形成し、
その後、シリコンに対して選択的であり且つシリコンゲルマニウムに対して選択的でないウェットエッチングを用いて、前記スペーサ同士の間に配置された前記フィン構造から前記エピタキシャルシリコンの層を除去する
ことを有する方法。 - 前記フィン構造のシリコンゲルマニウム(SiGe)ナノワイヤ同士の間のシリコンの全てを除去した後、前記SiGeナノワイヤが部分的にエッチングされる、請求項19に記載の方法。
- 前記ウェットエッチングは、前記スペーサ内での横方向エッチングを最小化するよう、異方性エッチングを有する、請求項20に記載の方法。
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