JP4461154B2 - 半導体装置 - Google Patents
半導体装置 Download PDFInfo
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- JP4461154B2 JP4461154B2 JP2007129579A JP2007129579A JP4461154B2 JP 4461154 B2 JP4461154 B2 JP 4461154B2 JP 2007129579 A JP2007129579 A JP 2007129579A JP 2007129579 A JP2007129579 A JP 2007129579A JP 4461154 B2 JP4461154 B2 JP 4461154B2
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Description
本発明の実施形態は、p型FinFETとn型FinFETとから構成されるインバータ回路において、インバータ回路のノードとなるp型FinFETのコンタクト領域の幅が、n型FinFETのチャネル領域の幅よりも広いことを特徴とする。
(1) 第1の実施形態
(a) 構造
図1乃至図4を用いて、本発明の第1の実施形態について説明する。
つまり、p型FinFET P1,P2のフィン部のうちチャネル領域2は、例えば、n型FinFET N1〜N4のフィン幅W3と同程度のフィン幅W2となっている。そして、p型FinFET P1,P2の一端側及び他端側のコンタクト領域のうち、ノードND,/NDに接続されるコンタクト領域3のフィン幅W1が、チャネル領域2,5のフィン幅W2,W3よりも広い。このコンタクト領域3のフィン幅W1は、例えば、50〜100nmに設定される。
それゆえ、インバータ回路21A,21BのノードND,/NDの接合容量を増大させることができる。
以下、図5乃至図8、図2及び図3を用いて、第1の実施形態のFinFETを用いたインバータ回路21A,21Bを含むSRAMの製造方法について説明する。
図9及び図10を用いて、本発明の第2の実施形態について説明する。尚、本実施形態において、第1の実施形態と同一部材に関しては同一符号を付し、詳細な説明は省略する。
図11及び図12を用いて、本発明の第3の実施形態について、説明する。尚、本実施形態において、第1及び第2の実施形態と同一部材に関しては、同一符号を付し、詳細な説明は省略する。
それゆえ、基板バイアス効果により、p型FinFETのしきい値電圧等の電気的特性を変化できる。
(a) 構造
図13及び図14を用いて、本発明の第4の実施形態について説明する。尚、本実施形態において、第1乃至第3の実施形態と同一部材に関しては、同一符号を付し、詳細な説明は省略する。
以下、図15乃至図22を用いて、本実施形態の製造例について説明する。
次に、図20に示すように、例えば、第3のマスク層8としてのSiN膜が全面に形成される。そして、マスク層8の上面には、第1及び第2の実施形態と同様の工程で、n型及びp型FinFET形成予定領域内に、所定のフィン幅のフィン部が形成されるように、側壁マスク10或いはレジストマスク11がそれぞれ形成される。
その後、マスク10,11を除去すると、図21に示すように、所定のフィン幅のフィン部2A,3,5が、n型及びp型FinFET形成予定領域内に形成される。
以下、第1乃至第4の実施形態の変形例について説明する。尚、第1乃至第4の実施形態と同一部材に関しては、同一符号を付し、詳細な説明は省略する。
つまり、ドライバトランジスタの電流駆動力Idr(N1),Idr(N2)を、トランスファゲートトランジスタの電流駆動力Itr(N3),Itr(N4)よりも向上させることで、β比を大きくすることができる。
以下、本変形例の製造方法について、説明する。
第1乃至第4の実施形態及び変形例においては、FinFETからなるインバータ回路を含むSRAMを例に、本発明の例の特徴及び効果を説明した。しかし、本発明の例は、SRAMにのみ適用されるものではない。即ち、本発明の実施形態のFinFETからなるインバータ回路を用いた、例えば、NANDゲート回路などのロジック回路に適用しても、駆動特性を改善することができる。
Claims (5)
- 半導体基板上に配置され、1つのインバータを構成するn型FinFETとp型FinFETを具備し、前記n型及びp型FinFETのそれぞれは、アクティブ領域としてのフィン部と、ゲート絶縁膜を介して、前記フィン部のうちチャネル領域と立体交差するゲート電極とを有するとともに、前記フィン部のうち前記チャネル領域を挟んだ一端側及び他端側にそれぞれコンタクト領域が設けられ、前記n型FinFETのチャネル幅と前記p型FinFETのチャネル幅は同じであり、前記インバータの出力ノードとなる前記p型FinFETのコンタクト領域のフィン幅は、前記n型FinFETのチャネル領域のフィン幅及び前記n型FinFETのコンタクト領域のフィン幅よりも広いことを特徴とする半導体装置。
- 前記p型FinFETのチャネル領域のフィン幅は、前記n型FinFETのチャネル領域のフィン幅よりも広いことを特徴とする請求項1に記載の半導体装置。
- 前記p型FinFETのチャネル領域の不純物濃度は、前記n型FinFETのチャネル領域の不純物濃度よりも高いことを特徴とする請求項1又は2に記載の半導体装置。
- 前記半導体基板は、SOI領域とバルク領域からなり、前記n型FinFETは、前記SOI領域内に配置され、前記p型FinFETは前記バルク領域内に配置されることを特徴とする請求項1乃至3のいずれか1項に記載の半導体装置。
- 前記p型FinFETは、Nウェル領域内に設けられ、前記Nウェル領域には、バイアス電圧が印加されることを特徴とする請求項1乃至4のいずれか1項に記載の半導体装置。
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