JP6373509B2 - 半導体デバイス、及び半導体デバイスの製造方法 - Google Patents
半導体デバイス、及び半導体デバイスの製造方法 Download PDFInfo
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Description
Claims (20)
- 半導体デバイスの異なる深さにおいて平行に延在する複数のキャリアチャネルを形成する層状構造と、
前記層状構造に貫入して、前記異なる深さにおいて対応するキャリアチャネルに到達し、前記キャリアチャネルを制御する、異なる長さの複数のゲートフィンガーを有するゲート電極と、
前記層状構造に貫入して、前記対応するキャリアチャネルにアクセスする、異なる長さの複数のキャリアフィンガーを有するキャリア電極であって、前記キャリアフィンガーは、前記ゲートフィンガーと互い違いに配置される、キャリア電極と、
を備える、半導体デバイス。 - 前記キャリア電極は、キャリア電荷を前記複数のキャリアチャネルに提供するためのソース電極、又は前記複数のキャリアチャネルから前記キャリア電荷を受け取るためのドレイン電極である、請求項1に記載の半導体デバイス。
- キャリアチャネルは多数キャリアチャネル又は少数キャリアチャネルであり、前記多数キャリアチャネル内のキャリアは電子を含み、前記少数キャリアチャネル内のキャリアは正孔を含む、請求項1に記載の半導体デバイス。
- 前記キャリアチャネルは、p−n接合部、金属半導体構造、金属酸化物半導体構造、トンネリング構造、ヘテロ構造及び表面量子井戸のうちの1つ又は組み合わせによって形成することができ、前記キャリアチャネルを形成する前記層状構造の各層の材料は、化合物半導体、シリコン、ゲルマニウム、有機半導体、ダイアモンド、カーボンナノチューブ、グラフェン、二硫化モリブデン及び窒化ホウ素のうちの1つ又はこれらの組み合わせを含む、請求項1に記載の半導体デバイス。
- 前記ゲートフィンガーの側壁に配設されたゲート誘電体を更に備える、請求項1に記載の半導体デバイス。
- 少なくともいくつかのゲートフィンガーの底部は、前記ゲートフィンガーによって制御される前記対応するキャリアチャネルに対し異なる距離を有する、請求項1に記載の半導体デバイス。
- 前記ゲートフィンガーの底部に配設されたゲート誘電体を更に備える、請求項6に記載の半導体デバイス。
- 前記ゲートフィンガーに配設されたゲートフィールドプレートを更に備える、請求項1に記載の半導体デバイス。
- 前記層状構造の各層は、部分的に高濃度でドープされ、前記キャリアチャネルのための同様のソース−ドレイン間距離を強制する、請求項1に記載の半導体デバイス。
- 前記層状構造は、エッチングストップ、キャリア閉じ込め、及び放熱層のうちの1つ又は組み合わせとしての役割を果たす背面障壁層を含む、請求項1に記載の半導体デバイス。
- 前記層状構造は、化合物半導体及び/又はダイアモンドを含み、各キャリアチャネルは、2次元電子ガス(2DEG)チャネル又は2次元正孔ガス(2DHG)チャネルであり、前記2DEGチャネル又は前記2DHGチャネルは、前記化合物半導体のヘテロ構造内に又は前記ダイアモンドの表面に形成される、請求項1に記載の半導体デバイス。
- 前記化合物半導体はIII族窒化物半導体であり、前記ヘテロ構造は、第1のIII族窒化物層及び第2のIII族窒化物層を含み、前記第1のIII族窒化物層は前記第2のIII族窒化物層のバンドギャップよりも大きいバンドギャップを有する、請求項11に記載の半導体デバイス。
- 前記第1のIII族窒化物層はGaNであり、前記第2のIII族窒化物層はAlGaN、InAlN、InAlGaN又はAlNである、請求項12に記載の半導体デバイス。
- キャリア電荷を受け取る際に複数のキャリアチャネルが半導体デバイスの異なる深さにおいて平行に延在することを可能にする層状構造を形成することと、
ゲート電極及びキャリア電極の複数のフィンガーのための前記層状構造におけるトレンチを形成することであって、前記ゲート電極及び前記キャリア電極の前記フィンガーのための前記トレンチは、前記異なる深さにおける対応するキャリアチャネルにアクセスするための異なる長さを有することと、
前記ゲート電極及び前記キャリア電極を形成することであって、前記キャリア電極の前記フィンガーは前記ゲート電極の前記フィンガーと互い違いに配置されていることと、
を含む、半導体デバイスの製造方法。 - 前記トレンチは前記層状構造内にエッチングされる、請求項14に記載の方法。
- 前記ゲート電極の前記フィンガーの長さを、前記対応するキャリアチャネルに到達し、前記キャリアチャネルを制御するように選択することと、
前記キャリア電極の前記フィンガーの長さを、前記対応するキャリアチャネルにアクセスするように選択することと、
を更に含む、請求項14に記載の方法。 - 全てのキャリアチャネルに共通の第2のキャリア電極を設けることを更に含む、請求項14に記載の方法。
- 前記層状構造の各層を部分的に高濃度でドープすることであって、前記高濃度でドープされた領域の長さは、異なる層について異なり、全てのキャリアチャネルに同一のソース−ドレイン間距離をもたらすことを更に含む、請求項14に記載の方法。
- 前記ゲート電極の前記フィンガー付近にゲート誘電体及びフィールドプレートを堆積することを更に含む、請求項14に記載の方法。
- エッチングストップ層を用いて前記トレンチが形成される、請求項14に記載の方法。
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