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改善された帯域劣化により高熱電気性能を持つ全スケール階層構造のp型PbSe合金
Gangjian Tan1, Shiqiang Hao, Songting Cai
1State Key Laboratory of Advanced Technology for Materials Synthesis and Processing , Wuhan University of Technology , Wuhan 430070 , P. R. China.
Journal of the American Chemical Society
|February 20, 2019
まとめ
鉛セレニド (PbSe) と鉛テルリド (PbTe) とカドミウム (Cd) の階層的なバンドエンジニアリングは熱電性能を大幅に高めます. この戦略により,シーベック係数が増加し,熱伝導性が低下し,PbSeベースの材料の記録的なZT値が達成されます.
科学分野:
- 材料科学
- 固体物理学
- 熱電機
背景:
- 鉛セレニド (PbSe) は熱電学的応用の可能性を示しているが,最適化が必要である.
- 電子帯域構造のチューニングは熱電効率の向上に不可欠です.
研究 の 目的:
- PbSeの電子帯構造を階層的に設計し,熱電性能を向上させる.
- PbTeを合金化し,Cdを代用することで,PbSeの熱電特性への影響を調査する.
主な方法:
- PbSeとPbTeを合金して,バレンツ帯のエネルギーオフセット (Δ EV) を修正する.
- PbサイトでのCd置換により,Δ EVとシーベック係数をさらに調整する.
- 電荷輸送とグリッドの熱伝導性の分析
主要な成果:
- 15mol %のPbTeを合金すると,PbSeにおける温度誘発のバレンツ帯収束が加速する.
- 3 mol % Cdの置換により,Δ EVが減り,シーベック係数が増加する.
- ラットスの熱伝導性は,無形に近い限度 (0.5 W m−1 K−1) に減少した.
- Pb0.95Na0.02Cd0.03Se0.85Te0.15でピークZTは1.7で,平均ZTは~1 (400~900K) であった.
結論:
- 合金と置換による階層帯の工学は,PbSeベースの熱電学にとって効果的な戦略です.
- 開発された材料は,原始PbSeと比較して,熱電性能を大幅に向上させています.
- この研究は高性能の熱電性材料の設計のための経路を提供します.
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