負容量は,高電子移動性トランジスタにおけるショットキーゲート限界を上回る.
Asir Intisar Khan1,2, Jeong-Kyu Kim3, Urmita Sikder1
1Department of Electrical Engineering and Computer Sciences, University of California, Berkeley, Berkeley, CA, USA.
Science (New York, N.Y.)
|July 10, 2025
まとめ
研究者は高電子移動性トランジスタ用の新しいゲート介電器を開発した. このHfO2-ZrO2の二重層はオン電流を増加させ,漏れを軽減し,従来のショットキー GaNトランジスタの限界を克服します.
科学分野:
- 材料科学
- 半導体物理学
- 装置工学
背景:
- 高電子移動性トランジスタ (HEMT) は,高性能のために二次元電子ガス (2DEG) を利用します.
- AlGaN/GaN HEMT のショットキーゲートは,誘導電荷と電流を最大化しますが,ゲート漏れが高くなります.
- 従来の介電層は漏れを減らすだけでなく,排水電流を減少させ,性能のトレードオフを提示します.
研究 の 目的:
- HEMTにおける従来のゲート介電体の限界を克服する.
- オン電流の同時増強とリーク電流の減少を実現する.
- 先進的な半導体装置のゲート介電体としての鉄電性材料を探求する.
主な方法:
- ゲートダイエレクトリックとしてHfO2-ZrO2の二重層の製造.
- 二重層をHEMTのAlGaN/GaNヘテロ構造に統合する.
- トランジスタの性能の特徴,オン電流と漏れ電流を含む.
主要な成果:
- HfO2-ZrO2バイレイヤは,従来のショットキーゲートと比較してオン電流を大幅に増加させた.
- 新しい介電器でゲート漏れ電流の大幅な減少が観察されました.
- 改善されたオン電流と減少した漏れの組み合わせは,標準的な介電剤では前例のないものです.
結論:
- HfO2-ZrO2二重層は,高性能HEMTのための新しい解決策を提供します.
- このアプローチは,Schottkyのゲートデザインに関連する従来のトレードオフを上回ります.
- 2DEG技術に基づくトランジスタの進歩に新しい道を開きます.
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