LiZnSbの多型化とユニークな場所の好み:優れた熱電力は,その真の色を明らかにする
Miles A White1, Gordon J Miller1,2, Javier Vela1,2
1Department of Chemistry, Iowa State University , Ames, Iowa 50011, United States.
Journal of the American Chemical Society
|October 22, 2016
まとめ
I-II-V半導体における最初のポリタイプである立方体LiZnSbを合成し,ユニークな性質を明らかにした. この立方相は,その六角相とは異なり,n型およびp型の両方のアプリケーションに高い熱電効率を示しています.
科学分野:
- 固体化学
- 材料科学
- 半導体物理学
背景:
- 一つの化合物の複数の結晶構造の存在であるポリティピズムは,多くの材料クラスで一般的です.
- I-II-V半導体は,電子と熱電学における潜在的な応用を持つ重要な材料のクラスです.
- 以前の研究では,熱電学的アプリケーションのためのI-II-V半導体の六角型ポリタイプが提案されました.
研究 の 目的:
- I-II-V半導体における多型化の最初の例を示します.
- LiZnSbの立方相を合成し,特徴づけること.
- 異なるLiZnSbポリタイプの熱電特性とエネルギー好みを調査する.
主な方法:
- 低温溶液相合成法
- 立方相を特定するための結晶分析
- 帯域構造と熱電効率を計算する.
主要な成果:
- I-II-V半導体の新しいポリタイプである立方体LiZnSbの合成に成功しました.
- キュービック・フェーズは 独特の色合いを表しています
- n型 (1.64) とp型 (1.43) の立方体LiZnSbで600Kで高い熱電効率を計算した.
- 立方相は六角相よりもエネルギー的に優れている.
結論:
- キュービックLiZnSbの合成は,I-II-V半導体におけるポリピズムを探索するための新しい道を開きます.
- 立方相は,六角相と比較して優れた熱電力を示しています.
- 立方相のエネルギー優位性は,六角形のポリタイプを合成する難しさを説明する.
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