JP5744854B2 - 複数の閾値電圧を有するナノワイヤ・メッシュfet及びその製造方法 - Google Patents
複数の閾値電圧を有するナノワイヤ・メッシュfet及びその製造方法 Download PDFInfo
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- H01L29/66439—Unipolar field-effect transistors with a one- or zero-dimensional channel, e.g. quantum wire FET, in-plane gate transistor [IPG], single electron transistor [SET], striped channel transistor, Coulomb blockade transistor
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Description
102:ウェハ
104:シリコン・オン・インシュレータ(SOI)層
106:埋め込み酸化物(BOX)層
108、112:犠牲層
110、114:シリコン(Si)層
116、120:ハードマスク
118:窒化物ライナ
122:ナノワイヤ・ハードマスク
122a:窒化物部分
122b:酸化物部分
124:酸化物層
126:ダミー・ゲート
136:フィラー層
138:トレンチ
140、146、148:ナノワイ・バー
142:スペーサ
150:置換ゲート
Claims (19)
- 各々が同一のソース領域とドレイン領域、及び前記ソース領域と前記ドレイン領域を接続する複数のナノワイヤ・チャネルを有し、前記複数のナノワイヤ・チャネルは複数のナノワイヤ・バー間の犠牲層を除去して垂直方向に離間して配置するように、スタック状に垂直方向に配向された複数のデバイス層であって、前記デバイス層の1つ又は複数は前記デバイス層の他の1つ又は複数とは異なる閾値電圧を有するように、前記ナノワイヤ・チャネルに対応する前記ナノワイヤ・バーの幅及び厚さを変化させて構成される、複数のデバイス層と、
前記ナノワイヤ・チャネルを取り囲む前記デバイス層の各々に共通のゲートと、
を含む電界効果トランジスタ(FET)。 - 前記デバイス層の1つ又は複数は閾値電圧Vt1を有するように構成され、前記デバイス層の他の1つ又は複数は閾値電圧Vt2を有するように構成され、前記閾値電圧Vt1を有するように構成された前記1つ又は複数のデバイス層に対応する前記ナノワイヤ・バーの幅及び厚さは、前記閾値電圧Vt2を有するように構成された前記デバイス層に対応する前記ナノワイヤ・バーの幅及び厚さより小さい前記ナノワイヤ・チャネルを有する、請求項1に記載のFET。
- Vt1はVt2より大きい、請求項2に記載のFET。
- 前記閾値電圧Vt1を有するように構成された前記1つ又は複数のデバイス層の前記ナノワイヤ・チャネルの各々は、1nmから10nmまでの幅と、1nmから10nmまでの厚さとを有する、請求項2に記載のFET。
- 前記閾値電圧Vt2を有するように構成された前記1つ又は複数のデバイス層の前記ナノワイヤ・チャネルの各々は、5nmから20nmまでの幅と、5nmから20nmまでの厚さとを有する、請求項2に記載のFET。
- 前記デバイス層の各々の前記ソース及びドレイン領域は、n型又はp型ドーパントでドープされる、請求項1に記載のFET。
- 前記デバイス層の各々の前記ナノワイヤ・チャネルは非ドープである、請求項1に記載のFET。
- 前記ゲートは誘電体により前記ナノワイヤ・チャネルから分離される、請求項1に記載のFET。
- 前記デバイス層の前記ソース及びドレイン領域と前記ゲートとの間のスペーサをさらに含む、請求項1に記載のFET。
- 前記ゲートは、ポリシリコン及び金属の1つ又は複数を含む、請求項1に記載のFET。
- FETを製造する方法であって、
各々が同一のソース領域とドレイン領域、及び前記ソース領域と前記ドレイン領域を接続する複数のナノワイヤ・チャネルを有し、前記複数のナノワイヤ・チャネルは複数のナノワイヤ・バー間の犠牲層を除去して垂直方向に離間して配置するように、スタック状に垂直方向に配向された複数のデバイス層を形成するステップと、
前記デバイス層の1つ又は複数を、前記デバイス層の他の1つ又は複数とは異なる閾値電圧を有するように、前記ナノワイヤ・チャネルに対応する前記ナノワイヤ・バーの幅及び厚さを変化させて構成するステップと、
前記ナノワイヤ・チャネルを取り囲む前記デバイス層の各々に共通のゲートを形成するステップと、
を含む方法。 - 前記デバイス層の1つ又は複数は閾値電圧Vt1を有するように構成され、前記デバイス層の他の1つ又は複数は閾値電圧Vt2を有するように構成され、前記方法は、
前記閾値電圧Vt1を有するように構成された前記1つ又は複数のデバイス層に対応する前記ナノワイヤ・バーの幅及び厚さは、前記閾値電圧Vt2を有するように構成された前記デバイス層に対応する前記ナノワイヤ・バーの幅及び厚さより小さい前記ナノワイヤ・チャネルを有するように構成する、請求項11に記載の方法。 - シリコン・オン・インシュレータ(SOI)ウェハを準備するステップと、
前記ウェハ上に、交互する一連のシリコン層及び犠牲層を形成するステップと、
前記シリコン層及び前記犠牲層内にナノワイヤ・バーのスタックをエッチングするステップと、
前記スタックから前記犠牲層を除去するステップと、
をさらに含む、請求項11に記載の方法。 - 前記スタックの上部層はシリコン層であり、前記方法は、
前記上部シリコン層をエッチングして内部に複数のナノワイヤ・バーを形成するステップと、
前記上部シリコン層内に形成された前記ナノワイヤ・バーを横方向に薄層化するステップと、
をさらに含む、請求項13に記載の方法。 - 前記スタックの前記上部シリコン層は、前記スタック内の前記シリコン層の他の1つ又は複数より薄い、請求項14に記載の方法。
- 前記犠牲層の各々はシリコン・ゲルマニウムを含み、前記方法は、
前記犠牲層の各々をn型又はp型ドーパントでドープするステップと、
前記ドーパントを前記犠牲層から前記デバイス層の前記ソース及びドレイン領域に拡散させるステップと、
をさらに含む、請求項13に記載の方法。 - 前記上部シリコン層内に形成された前記ナノワイヤ・バーを横方向に薄層化するステップは、
前記上部シリコン層内に形成された前記ナノワイヤ・バーを酸化させるステップをさらに含む、請求項14に記載の方法。 - 前記スタックの上に複数のナノワイヤ・ハードマスクを形成するステップと、
前記エッチング・ステップ中、前記ナノワイヤ・ハードマスクをマスクとして用いて、前記ナノワイヤ・バーを形成するステップと、
をさらに含む、請求項13に記載の方法。 - 前記ゲートを形成するステップの前に前記ナノワイヤ・チャネル上に誘電体を形成するステップをさらに含む、請求項11に記載の方法。
Applications Claiming Priority (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US12/470,159 | 2009-05-21 | ||
US12/470,159 US8422273B2 (en) | 2009-05-21 | 2009-05-21 | Nanowire mesh FET with multiple threshold voltages |
PCT/US2010/035047 WO2010135206A1 (en) | 2009-05-21 | 2010-05-16 | Nanowire mesh fet with multiple threshold voltages |
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JP2012527776A JP2012527776A (ja) | 2012-11-08 |
JP5744854B2 true JP5744854B2 (ja) | 2015-07-08 |
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