結晶構造改変によるp型SnSeの高熱電性能を実現
Bingchao Qin1, Dongyang Wang1, Wenke He1
1School of Materials Science and Engineering , Beihang University , Beijing 100191 , China.
Journal of the American Chemical Society
|December 14, 2018
まとめ
研究者らは,テルリウム (Te) を加えることで,セレニド (SnSe) の熱電性能を向上させた. この改変により,約1.6の記録的なZT値を達成し,熱電気材料のエネルギー変換効率を高めました.
科学分野:
- 材料科学
- 固体物理学
- エネルギー変換
背景:
- スチンのセレニド (SnSe) は,固有のアンハーモニシティと複数のバレンスの帯により,熱電気的可能性で認識されています.
- 熱電気エネルギー変換技術の進歩には,SnSeの性能を最適化することが不可欠です.
研究 の 目的:
- p型SnSe結晶の熱電性値 (ZT) を強化する.
- テルリウム (Te) 合金によるSnSe結晶構造と熱電特性への影響を調査する.
主な方法:
- Te合金によるSnSe結晶の合成
- 300Kから793Kまでの熱電特性 (ZT,パワーファクター,シーベック係数,熱伝導性) の測定
- 電子局所関数計算とキャラウェイモデル分析.
- 偏差修正スキャニング伝送電子顕微鏡を用いた構造的特徴化.
主要な成果:
- 300~793Kの温度範囲で記録的に高い平均ZT値 ~1.6を達成し,ピークZTは793Kで2.1でした.
- 300 Kで ~55 μW cm-1 K-2 に達するパワーファクターの有意な強化が観察され,キャリアの移動性が増加し,バレンスの帯が鋭くなりました.
- 亜鉛合金による網膜の熱伝導性の低下が示され,亜鉛の原子の移転と構造的障害が促進された.
結論:
- テ合金により,SnSeの熱電性能が向上し,パワーファクターとグリッドの熱伝導性が最適化されます.
- 合金による結晶構造の変更戦略は,熱電性材料,特に低対称性のものを改善するための有望な経路を提供します.
- この研究は,効率的なエネルギー変換のための高度な熱電気材料の設計のための新しい道を示しています.
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