JP6961086B2 - 高電子移動度トランジスタ及び高電子移動度トランジスタを製造する方法 - Google Patents
高電子移動度トランジスタ及び高電子移動度トランジスタを製造する方法 Download PDFInfo
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Description
層のスタックを含むチャネル半導体構造体であって、前記層のスタックは、前記層の材料の分極の大きさの順に重なり合って配置されて、前記スタックにおける層の各対によって形成されたヘテロ接合において複数のキャリアチャネルを形成し、前記層のスタックは第1の層及び第2の層を含み、前記第1の層の分極の大きさは、前記スタックにおいて前記第1の層の下に配置された前記第2の層の分極の大きさより大きく、前記チャネル半導体構造体の階段状輪郭を形成するように、前記第1の層の幅は前記第2の層の幅より小さい、チャネル半導体構造体と、
高濃度にドープされた半導体材料を含むソース半導体構造体であって、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにキャリアを提供するソース半導体構造体と、
前記高濃度にドープされた半導体材料を含むドレイン半導体構造体であって、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにおける前記キャリアを受け取る、ドレイン半導体構造体と、
各キャリアチャネルと電気的に接触するように前記ソース半導体構造体に配置されたソース電極と、
各キャリアチャネルと電気的に接触するように前記ドレイン半導体構造体に配置されたドレイン電極と、
前記キャリアチャネルの導電率を変調するように、前記HEMTの長さに沿って前記ソース電極と前記ドレイン電極との間に配置されたゲート電極であって、前記チャネル半導体構造体の前記階段状輪郭をたどって踏面及び蹴込部を有する階段形状を有する、ゲート電極と、
を備える、HEMTを開示する。
基板と、層のスタックを含むチャネル半導体構造体とを準備することであって、前記層のスタックは、前記層の材料の分極の大きさの順に重なり合って配置されて、前記スタックにおける層の各対によって形成されたヘテロ接合において複数のキャリアチャネルを形成し、前記層のスタックは第1の層及び第2の層を含み、前記第1の層の分極の大きさは、前記スタックにおいて前記第1の層の下に配置された前記第2の層の分極の大きさより大きく、前記チャネル半導体構造体の階段状輪郭を形成するように、前記第1の層の幅は前記第2の層の幅より小さい、準備することと、
前記チャネル半導体構造体をエッチングして前記トランジスタの活性領域を画定することと、
高濃度にドープされた半導体材料を含むソース半導体構造体を形成することであって、前記ソース半導体構造体は、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにキャリアを提供する、形成することと、
前記高濃度にドープされた半導体材料を含むドレイン半導体構造体を形成することであって、前記ドレイン半導体構造体は、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにおける前記キャリアを受け取る、形成することと、
各キャリアチャネルと電気的に接触するように前記ソース半導体構造体に配置されたソース電極を形成することと、
各キャリアチャネルと電気的に接触するように前記ドレイン半導体構造体に配置されたドレイン電極を形成することと、
前記キャリアチャネルの導電率を変調するように、前記HEMTの長さに沿って前記ソース電極と前記ドレイン電極との間に配置されたゲート電極を形成することであって、前記ゲート電極は、前記チャネル半導体構造体の前記階段状輪郭をたどって踏面及び蹴込部を有する階段形状を有する、形成することと、
を含む、方法を開示する。
Claims (12)
- 高電子移動度トランジスタ(HEMT)であって、
層のスタックを含むチャネル半導体構造体であって、前記層のスタックは、前記層の材料の分極の大きさの順に重なり合って配置されて、前記スタックにおける層の各対によって形成されたヘテロ接合において複数のキャリアチャネルを形成し、前記層のスタックは第1の層及び第2の層を含み、前記第1の層の分極の大きさは、前記スタックにおいて前記第1の層の下に配置された前記第2の層の分極の大きさより大きく、前記チャネル半導体構造体の階段状輪郭を形成するように、前記第1の層の幅は前記第2の層の幅より小さいものと、
高濃度にドープされた半導体材料を含むソース半導体構造体であって、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにキャリアを提供するものと、
前記高濃度にドープされた半導体材料を含むドレイン半導体構造体であって、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにおける前記キャリアを受け取るものと、
各キャリアチャネルと電気的に接触するように前記ソース半導体構造体に配置されたソース電極と、
各キャリアチャネルと電気的に接触するように前記ドレイン半導体構造体に配置されたドレイン電極と、
前記キャリアチャネルの導電率を変調するように、前記HEMTの長さに沿って前記ソース電極と前記ドレイン電極との間に配置されたゲート電極であって、前記チャネル半導体構造体の前記階段状輪郭をたどって踏面及び蹴込部を有する階段形状を有するものと、
を備える、HEMT。 - 前記ゲート電極と前記チャネル半導体構造体との間に配置された誘電体の層、を更に備える、請求項1に記載のHEMT。
- 前記踏面は同一の幅を有する、請求項1に記載のHEMT。
- 前記踏面は異なる幅を有する、請求項1に記載のHEMT。
- 前記蹴込部は同一の高さを有する、請求項1に記載のHEMT。
- 前記蹴込部は異なる高さを有する、請求項1に記載のHEMT。
- 前記ソース電極と前記ゲート電極との間の距離は、前記ゲート電極と前記ドレイン電極との間の距離より小さい、請求項1に記載のHEMT。
- 前記チャネル半導体構造体の材料は、窒化ガリウム(GaN)、窒化インジウムガリウム(InGaN)、窒化アルミニウムガリウム(AlGaN)、及び窒化アルミニウム(AlN)のうちの1つ又は組合せを含む、請求項1に記載のHEMT。
- ソース半導体領域及びドレイン半導体領域は、窒化ガリウム(GaN)および窒化インジウムガリウム(InGaN)のうちの1つ又は組み合わせを含む、請求項1に記載のHEMT。
- 高電子移動度トランジスタ(HEMT)を製造する方法であって、
基板と、層のスタックを含むチャネル半導体構造体とを準備することであって、前記層のスタックは、前記層の材料の分極の大きさの順に重なり合って配置されて、前記スタックにおける層の各対によって形成されたヘテロ接合において複数のキャリアチャネルを形成し、前記層のスタックは第1の層及び第2の層を含み、前記第1の層の分極の大きさは、前記スタックにおいて前記第1の層の下に配置された前記第2の層の分極の大きさより大きく、前記チャネル半導体構造体の階段状輪郭を形成するように、前記第1の層の幅は前記第2の層の幅より小さいものと、
高濃度にドープされた半導体材料を含むソース半導体構造体を形成することであって、前記ソース半導体構造体は、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにキャリアを提供するものと、
前記高濃度にドープされた半導体材料を含むドレイン半導体構造体を形成することであって、前記ドレイン半導体構造体は、前記チャネル半導体構造体に電気的に接続されて全てのキャリアチャネルにおける前記キャリアを受け取るものと、
各キャリアチャネルと電気的に接触するように前記ソース半導体構造体に配置されたソース電極を形成することと、
各キャリアチャネルと電気的に接触するように前記ドレイン半導体構造体に配置されたドレイン電極を形成することと、
前記キャリアチャネルの導電率を変調するように、前記HEMTの長さに沿って前記ソース電極と前記ドレイン電極との間に配置されたゲート電極を形成することであって、前記ゲート電極は、前記チャネル半導体構造体の前記階段状輪郭をたどって踏面及び蹴込部を有する階段形状を有するものと、
を含む、方法。 - 前記ソース電極、前記ドレイン電極、および前記ゲート電極は、電子ビーム物理蒸着(EBPVD)、ジュール蒸発、化学気相成長及びスパッタリングプロセスのうちの1つ又は組合せを使用して形成される、請求項10に記載の方法。
- 前記チャネル半導体構造体は、化学気相成長(CVD)、有機金属化学気相成長(MOCVD)、分子ビームエピタキシー(MBE)、有機金属気相成長エピタキシー(MOVPE)、プラズマ促進化学気相成長(PECVD)及びマイクロ波プラズマ堆積のうちの1つ又は組合せを使用して作製される、請求項10に記載の方法。
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