JP2015213200A - 電界効果トランジスタ及びその製造方法 - Google Patents
電界効果トランジスタ及びその製造方法 Download PDFInfo
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Abstract
【解決手段】 この構造及び方法は、大部分が、バルクCMOSのプロセスフロー及び製造技術を再利用することによって実現され得る。この構造及び方法は、深空乏化チャネル(DDC)設計に関係し、CMOSベースのデバイスが従来のバルクCMOSと比較して低減されたσVTを有することを可能にするとともに、チャネル領域にドーパントを有するFETの閾値電圧VTがより正確に設定されることを可能にする。DDC設計はまた、従来のバルクCMOSトランジスタと比較して強いボディ効果を有し、それにより、電力制御の有意義な動的制御が可能になる。
【選択図】 図2A
Description
パスゲート(PG):W/L=70nm/40nm
プルダウン(PD):W/L=85nm/35nm
プルアップ(PU):W/L=65nm/35nm
この例は、45nmプロセスノードにおいて、x×y=0.72μm×0.475μm=0.342μm2の面積をもたらす。
Claims (15)
- ソースと、ドレインと、ゲート長を有するゲートとを有する電界効果トランジスタ(FET)であって、
第1のドーパント濃度を有するドープされたウェルと、
前記ドープされたウェルと接触し、前記ゲートの下方に配置された遮蔽領域であり、前記第1のドーパント濃度より高い第2のドーパント濃度を有する遮蔽領域と、
前記第1のドーパント濃度より低く且つ5×1017原子/cm3より低いドーパント濃度を有する低ドーパントチャネル領域であり、前記ドレインと前記ソースとの間且つ前記遮蔽領域と前記ゲートとの間に前記ゲート長の1/2より小さい厚さで配置された低ドーパントチャネル領域と、
前記低ドーパントチャネル領域と前記遮蔽領域との間の閾値電圧調整領域であり、前記第1のドーパント濃度より高く且つ前記第2のドーパント濃度より低い第3のドーパント濃度を有する閾値電圧調整領域と、
を有し、
前記ドープされたウェル、前記遮蔽領域、前記チャネル領域、及び前記閾値電圧調整領域は、前記ソース及び前記ドレインと反対の導電型を有する、
FET。 - 前記ゲートの下方に形成される空乏層の深さは、前記ゲート長の1/2以上且つ前記ゲート長以下である、請求項1に記載のFET。
- 前記低ドーパントチャネル領域は第1のエピタキシャル層として形成され、前記閾値電圧調整領域は第2のエピタキシャル層として形成され、或いは、前記低ドーパントチャネル領域及び前記閾値電圧調整領域は単一のエピタキシャル層として形成される、請求項1又は2に記載のFET。
- 前記遮蔽領域の前記第2のドーパント濃度は、5×1018原子/cm3より高い、請求項1乃至3の何れか一項に記載のFET。
- 前記閾値電圧調整領域の前記第3のドーパント濃度は、5×1017原子/cm3より高く、5×1018原子/cm3より低い、請求項1乃至4の何れか一項に記載のFET。
- 前記遮蔽領域の前記第2のドーパント濃度は、前記低ドーパントチャネル領域のドーピング濃度の10倍より高い、請求項1乃至5の何れか一項に記載のFET。
- 前記閾値電圧調整領域の前記第3のドーパント濃度は、前記遮蔽領域のドーピング濃度の1/50から1/2の間である、請求項1乃至6の何れか一項に記載のFET。
- 前記遮蔽領域は、5nmより大きい厚さを有する層を有し、且つ/或いは
前記低ドーパントチャネル領域は、5nmより大きい厚さを有する層を有し、且つ/或いは
前記閾値電圧調整領域は、5nmより大きい厚さを有する層を有する、
請求項1に記載のFET。 - 前記遮蔽領域は、5nmより大きく50nmより小さい厚さを有する平面状の層を有し、且つ/或いは
前記低ドーパントチャネル領域は、5nmより大きく20nmより小さい厚さを有する平面状の層を有し、且つ/或いは
前記閾値電圧調整領域は、前記遮蔽領域に接触し且つ5nmより大きく50nmより小さい厚さを有する平面状の層を有する、
請求項1に記載のFET。 - ソースと、ドレインと、ゲート長を有するゲートとを有する電界効果トランジスタ(FET)を製造する方法であって、順次に、
ドープされたウェル内に、第1のドーパント濃度を有する遮蔽領域を形成する工程と、
イオン注入及び/又は前記遮蔽領域からの拡散によってドープされるエピタキシャル層を形成することで、前記遮蔽領域の上に第1の厚さを有する閾値電圧調整領域を作り出す工程であり、該閾値電圧調整領域は、前記第1のドーパント濃度より低い第2のドーパント濃度を有する、工程と、
前記閾値電圧調整領域の上に、第2の厚さを有するエピタキシャル層によって形成され且つ前記第2のドーパント濃度より低く且つ5×1017原子/cm3より低いドーピング濃度を有する低ドーパントチャネル領域を形成する工程であり、前記閾値電圧調整領域及び前記低ドーパントチャネル領域それぞれの前記第1の厚さ及び前記第2の厚さを足した厚さが、前記ゲートの前記ゲート長の1/2より大きく設定される、工程と、
前記低ドーパントチャネル領域、前記閾値電圧調整領域及び前記遮蔽領域をエッチングして、前記FETをアイソレートする工程と、
前記低ドーパントチャネル領域の上にゲートを形成する工程と、
を有し、
前記ドープされたウェル、前記遮蔽領域、前記チャネル領域、及び前記閾値電圧調整領域は、前記ソース及び前記ドレインと反対の導電型を有する、
方法。 - 前記遮蔽領域の前記第1のドーパント濃度は、5×1018原子/cm3より高く、且つ前記閾値電圧調整領域の前記第2のドーパント濃度は、5×1017原子/cm3より高く、5×1018原子/cm3より低い、請求項10記載の方法。
- 前記閾値電圧調整領域の前記第2のドーパント濃度は、前記遮蔽領域のドーピング濃度の1/50から1/2の間である、請求項10又は11に記載の方法。
- 前記遮蔽領域は、5nmより大きい厚さを有する平面状の層を有する、
請求項10乃至12の何れか一項に記載の方法。 - 前記低ドーパントチャネル領域は、5nmと20nmとの間の厚さを有する平面状の層を有する、請求項10乃至13の何れか一項に記載の方法。
- 前記閾値電圧調整領域は、5nmと50nmとの間の厚さを有する平面状の層を有する、請求項10乃至14の何れか一項に記載の方法。
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