Cu2I2Se6:室温での光子検出のための金属無機フレームワイドバンドギャップ半導体
Wenwen Lin1, Constantinos C Stoumpos1, Oleg Y Kontsevoi1
1Department of Chemistry, ‡Department of Physics and Astronomy, #Northwestern-Argonne Institute of Science and Engineering, and §Department of Materials Science and Engineering, Northwestern University , Evanston, Illinois 60208, United States.
Journal of the American Chemical Society
|January 16, 2018
まとめ
新しい半導体であるセレニド銅 (Cu2I2Se6) は,放射能検出の有望性を示しています. その高い安定性と電気的特性により,先進的な光子と硬質放射線検出器に適しています.
科学分野:
- 材料科学
- 固体物理学
- 半導体物理学
背景:
- ブロードバンドギャップ半導体は 先進的な放射線検出技術にとって不可欠です
- 高い安定性と優れた電子特性を持つ新しい材料の開発は,継続的な課題です.
研究 の 目的:
- Cu2I2Se6という新しい半導体の性質を調査し,硬質放射線と光子検出の潜在的応用を図る.
- 構造,電子,検出器の性能を特徴づける
主な方法:
- 電子帯域構造の密度関数理論 (DFT) 計算
- シングル結晶の成長のための垂直ブリッジマン法.
- 電子の移動性を測定するための飛行時間技術.
主要な成果:
- Cu2I2Se6は間接的な帯域差 (1.95 eV) と高い安定性を示しています.
- センチメートルサイズの単一結晶は,高い電気抵抗性 (> 10^12 Ω·cm) を成功裏に培った.
- 検出器は,X線に対する高感度と,アルファ粒子の良好なスペクトル性能を示し,電子の移動性は~46 cm^2·V^-1·s^-1であった.
結論:
- Cu2I2Se6は,ハード放射線と光子の検出のための有望な広帯域半導体です.
- 高い抵抗性と電子の移動性を含むその性質は,確立された検出器材料に匹敵します.
- Cu2I2Se6に関するさらなる研究により,放射線検出装置の改良が可能になる.
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