Enhancement of the thermoelectric properties of BaCu2Se2 by potassium doping

被引：14

作者：

Zhang, Han ^{[1
]}

Li, Shanming ^{[2
]}

Li, Dandan ^{[1
]}

Jin, Shifeng ^{[1
]}

Shen, Shijie ^{[1
]}

Ying, Tianping ^{[1
]}

Lin, Zhiping ^{[1
]}

Li, Kunkun ^{[1
]}

Yuan, Duanduan ^{[1
]}

Zhao, Huaizhou ^{[2
]}

机构：

[1] Res & Dev Ctr Funct Crystals, Beijing 100190, Peoples R China

[2] Chinese Acad Sci, Inst Phys, Beijing Natl Lab Condensed Matter Phys, Beijing 100190, Peoples R China

来源：

MATERIALS LETTERS | 2015年 / 152卷

基金：

中国国家自然科学基金;

关键词：

Semiconductors; Phase diagrams; Thermoelectric properties; Layered Ba0.7K0.3Cu2Se2 compound; Potassium doping; THERMAL-CONDUCTIVITY; OXYSELENIDES; TRANSPORT;

D O I：

10.1016/j.matlet.2015.03.098

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Layered compounds play an important role in thermoelectric materials exploration, as their thermal and electrical conductivities could be affected by different layers. Herein, we have synthesized a new layered Ba0.7K0.3Cu2Se2 phase with the ThCr2Si2 structure through 30% K doping on the Ba sites in the pristine orthorhombic BaCu2Se2. The layered Ba0.7K0.3Cu2Se2 exhibits intrinsically low lattice thermal conductivity due to its extremely short phonon mean free path. Ba0.7K0.3Cu2Se2 also features high hole mobility and reasonable Seebeck coefficient at high doping levels. The enhancement of electrical conductivity is mainly ascribed to the increase of the hole concentration and the unchanged high hole mobility. As a result, the peak ZT of Ba0.7K0.3Cu2Se2 reaches 0.32 at 800 K, which is of significance by comparing to its undoped BaCu2Se2 counterpart. (C) 2015 Elsevier B.V. All rights reserved.

引用

页码：117 / 120

页数：4

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