SnTeにおけるコドーピング:共鳴レベルと帯域収束のシナジーによる熱電性能の向上
Gangjian Tan, Fengyuan Shi, Shiqiang Hao
1§Department of Physics, University of Michigan, Ann Arbor, Michigan 48109, United States.
Journal of the American Chemical Society
|April 10, 2015
まとめ
この研究は,インジウム/カドミウムコドーピングとCdSナノ構造を用いて,亜鉛 Telluride (SnTe) の熱電性能を向上させています. このアプローチでは,ピーク値 (ZT) が約1.4に達し,SnTeは高温発電に有望である.
科学分野:
- マテリアルサイエンス 材料科学
- 固体物理 固体物理学
- ナノテクノロジー ナノテクノロジー
背景:
- チンテルリド (SnTe) は,熱電学的応用のための有望な材料です.
- 熱電性能の最適化には,メリット数 (ZT) の強化が必要です.
研究 の 目的:
- p型SnTeの熱電性能を大幅に改善する.
- 広い温度範囲で高いZT値を達成するために.
主な方法:
- インジウム (In) とカドミウム (Cd) のコドピングを用いてSnTe.
- カドミウム硫化物 (CdS) のナノ構造化アプローチを実装する.
- 階層的な構造化のためにスパークプラズマシンタリング (SPS) を採用します.
主要な成果:
- 923 Kで約1.4のピークZTを達成しました.
- シナージスティック・ドーピング効果により,幅広い温度範囲でシーベック係数とパワーファクターの強化が観察されました.
- 階層的なフォノン散乱によって熱伝導性が著しく低下した.
- 300 K から 923 K の間の約 0.8 の大きな平均 ZT を実証しました.
結論:
- In/CdコドーピングとCdSナノ構造化により,SnTeの熱電特性が効果的に強化されます.
- ドーピングとナノ構造の相乗効果は,SnTeを高温熱電発電のための競争力のあるp型材料にしています.
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