JP7495712B2 - 電界効果トランジスタ及びその設計方法 - Google Patents
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Description
以下、本発明の実施の形態を添付図面にしたがって説明する。
図1(a)は、本実施の形態に係る電界効果トランジスタ(FET)の垂直断面図であり、図1(b)はその平面図である。
図2に示すように、本実施の形態に係るFET1では、ゲート電極7とチャネル領域5間に、マイナス電荷からなる界面電荷11が形成されており、この界面電荷11とゲート絶縁膜6の影響(厚さ及び比誘電率)を考慮することで、4.5V以上のゲート閾値電圧Vthを実現している。以下、この点について詳細に説明する。
VFB=ΦMS+(Qit/Cox) ・・・(2)
式(2)中、φMSは仕事関数電位差(Ga2O3系半導体層2の仕事関数とゲート電極7の仕事関数との差分)であり、Qitは界面電荷11における単位面積当たりの実効界面電荷、COXは単位面積当たりのゲート絶縁膜6の静電容量である。
VGAO=(tGAOqND)/(2CGAO) ・・・(4)
VFB=ΦMS-VGAO+(Qit/Cox) ・・・(5)
式(5)より、フラットバンド電圧VFBは、ゲート絶縁膜6の影響により低下することが分かる。
Vth=VFB-(D2qND)/(2εsε0) ・・・(7)
なお、式(7)におけるVFBは、上述の式(5)により求める。
図4に示すFET1aは、図1(a)のFET1において、チャネル領域5とドレイン領域4に接する領域のGa2O3系半導体層2に形成されたドリフト領域13をさらに備えたものである。ドリフト領域13は、チャネル領域5とドレイン領域4に接する領域のGa2O3系半導体層2にイオン注入などによりn型不純物を添加することで形成される。
ゲート絶縁膜6を厚さ20nmのAl2O3とした図1(a)のFET1と、ゲート絶縁膜6を厚さ40nmのAl2O3とした図4のFET1aとを試作した。両FET1,1aとも、ゲート絶縁膜6はALD(原子層堆積)により形成した。ゲート電極7は、Niの上にAuを蒸着して形成し、仕事関数電位差φMSは1.2Vとした。ソース領域3及びドレイン領域4のドナーキャリア濃度は3×1019cm-3とし、チャネル領域5のドナーキャリア濃度は5×1017cm-3とし、ゲート長GLは1μm、チャネル深さDは45nmとした。また、FET1aにおけるドリフト領域13の長さDLは5μmとし、ドリフト領域13の厚さDdは105nmとした。
本実施の形態に係る電界効果トランジスタの設計方法では、上述の式(7)を用いて、少なくとも、界面電荷11、ゲート絶縁膜6の厚さ及び比誘電率を考慮して、ゲート閾値電圧Vthを決定する。より詳細には、本実施の形態に係る電界効果トランジスタの設計方法では、ゲート絶縁膜6の厚さ、ゲート絶縁膜6の比誘電率、チャネル領域5のドナーキャリア濃度、及びチャネル領域5のチャネル深さの何れか1つ以上を用いて、ゲート閾値電圧Vthを制御する。
以上説明したように、本実施の形態に係る電界効果トランジスタ1では、Ga2O3系半導体を用いた電界効果トランジスタにおいて、ゲート電極7とチャネル領域5間にマイナス電荷からなる界面電荷11が形成されており、この界面電荷11と、ゲート絶縁膜6の厚さ及び比誘電率を考慮してゲート閾値電圧Vthを制御することにより、ゲート閾値電圧Vthを4.5V以上としている。
Claims (12)
- Ga2O3系半導体層と、
前記Ga2O3系半導体層の内部に形成されたn型のソース領域及びn型のドレイン領域と、
前記ソース領域と前記ドレイン領域間の前記Ga2O3系半導体層であるn型のチャネル領域上に、ゲート絶縁膜を介して形成されたゲート電極と、
前記ソース領域に接続されたソース電極と、
前記ドレイン領域に接続されたドレイン電極と、
を備えた電界効果トランジスタであって、
前記ゲート電極と前記チャネル領域間にマイナス電荷からなる界面電荷が形成され、
ゲート閾値電圧が4.5V以上である、
電界効果トランジスタ。 - 前記チャネル領域のドナーキャリア濃度が、1×1015cm-3以上1×1018cm-3以下である、
請求項1に記載の電界効果トランジスタ。 - 前記チャネル領域の深さは10nm以上3μm以下とする、
請求項1または2に記載の電界効果トランジスタ。 - 前記ゲート絶縁膜が、Al2O3からなり、その厚さが5nm以上140nm以下である、
請求項1乃至3の何れか1項に記載の電界効果トランジスタ。 - 前記界面電荷は、前記チャネル領域の上部、または前記チャネル領域の前記ゲート絶縁膜との界面に形成される、
請求項1乃至4の何れか1項に記載の電界効果トランジスタ。 - 前記界面電荷は、前記ゲート絶縁膜の内部、または前記ゲート絶縁膜の前記チャネル領域との界面に形成される、
請求項1乃至4の何れか1項に記載の電界効果トランジスタ。 - 前記チャネル領域と前記ドレイン領域に接する領域の前記Ga2O3系半導体層に形成されたドリフト領域をさらに備えた、
請求項1乃至6の何れか1項に記載の電界効果トランジスタ。 - 前記Ga2O3系半導体層は、Ga2O3、AlN、SiC、ダイヤモンド、サファイア、Si、SiO2、Si3N4、あるいはBNのいずれかからなる基板上に形成されている、
請求項1乃至7の何れか1項に記載の電界効果トランジスタ。 - Ga2O3系半導体層と、
前記Ga2O3系半導体層の内部に形成されたn型のソース領域及びn型のドレイン領域と、
前記ソース領域と前記ドレイン領域間の前記Ga2O3系半導体層であるn型のチャネル領域上に、ゲート絶縁膜を介して形成されたゲート電極と、
前記ソース領域に接続されたソース電極と、
前記ドレイン領域に接続されたドレイン電極と、
を備えた電界効果トランジスタであって、
前記ゲート電極と前記チャネル領域間にマイナス電荷からなる界面電荷が形成され、
少なくとも、前記界面電荷、前記ゲート絶縁膜の厚さ及び比誘電率を考慮して決定されたゲート閾値電圧を有する、
電界効果トランジスタ。 - 前記ゲート絶縁膜の厚さ、前記ゲート絶縁膜の比誘電率、前記チャネル領域のドナーキャリア濃度、及び前記チャネル領域のチャネル深さの何れか1つ以上を用いて制御されたゲート閾値電圧を有する、
請求項9に記載の電界効果トランジスタ。 - Ga2O3系半導体層と、
前記Ga2O3系半導体層の内部に形成されたn型のソース領域及びn型のドレイン領域と、
前記ソース領域と前記ドレイン領域間の前記Ga2O3系半導体層であるn型のチャネル領域上に、ゲート絶縁膜を介して形成されたゲート電極と、
前記ソース領域に接続されたソース電極と、
前記ドレイン領域に接続されたドレイン電極と、
を備えた電界効果トランジスタの設計方法であって、
前記ゲート電極と前記チャネル領域間にマイナス電荷からなる界面電荷が形成され、
少なくとも、前記界面電荷、前記ゲート絶縁膜の厚さ及び比誘電率を考慮して、ゲート閾値電圧を決定する、
電界効果トランジスタの設計方法。 - 前記ゲート絶縁膜の厚さ、前記ゲート絶縁膜の比誘電率、前記チャネル領域のドナーキャリア濃度、及び前記チャネル領域のチャネル深さの何れか1つ以上を用いて、ゲート閾値電圧を制御する、
請求項11に記載の電界効果トランジスタの設計方法。
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