ロンボエドールと立方形の両方の高性能ゲート熱電学
Juan Li1, Xinyue Zhang1, Xiao Wang1
1Interdisciplinary Materials Research Center, School of Materials Science and Engineering , Tongji University , Shanghai 201804 , China.
Journal of the American Chemical Society
|October 27, 2018
まとめ
ゲルマニウムテルリド (GeTe) のアンチモニウムドーピングは,帯変性を強化し,熱伝導性を低下させることで熱電性能を最適化します. この研究は,立方体とロンボエドルの両方のGeTe段階において,2以上の高熱電位数 (zT) を達成します.
科学分野:
- 材料科学
- 固体物理学
- 熱電気材料
背景:
- ゲルマニウムテルリド (GeTe) は立方体とロンボエドール構造の間の相変化を示す.
- キュービックGeTeおよび関連するIV-VI半導体は,高帯変性により熱電性能に有益な2つの値帯構造 (L帯およびS帯) を有する.
- ロンボヘッドのゲテは 帯の順序と分裂が変化し 帯の変異を操作する新たな方法を示しています
研究 の 目的:
- アンチモニー (Sb) ドーピングを使用して,キャリア濃度を最適化し,格子歪みを操作します.
- 帯域の退廃を最大化し,GeTeベースの熱電学的性能を向上させる.
- Sbドーピングによるフォノン散乱による格子熱伝導性を減少させる.
主な方法:
- ゲルマニウムテルリド (GeTe) のアンチモニー (Sb) ドーピング
- キャリア濃度とロンボエドール格子歪みの調査.
- バンド構造操作とフォノン散乱機構の分析.
主要な成果:
- Sbドーピングにより キャリア濃度が最適化され ロンボエドール格子歪みが制御されました
- Sb-ドーピングは帯変性を強化し,PbTeの溶解性を促進し,Ge/Pb置換欠陥によるフォノン散乱を増加させた.
- ローンボエドールと立方GeTe相の両方で800K未満の温度で,2を超えた優れた熱電気値 (zT) が達成されました.
結論:
- SbドーピングされたGeTe合金は,優れた熱電特性を示し,800K以下のアプリケーションの主要な候補として位置づけられています.
- この研究は,熱電気材料の進歩における結晶構造の対称性の操作の重要な役割を強調しています.
- この研究は,制御されたドーピングと構造改変を通じて高性能熱電器を設計するための経路を提供します.
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