Enhanced thermoelectric performance of Cs doped BiCuSeO prepared through eco-friendly flux synthesis

被引：16
|
作者：
Achour, Abdenour [1 ]
Chen, Kan [2 ]
Reece, Michael J. [2 ]
Huang, Zhaorong [1 ]
机构：
[1] Cranfield Univ, Surface Engn & Nanotechnol Inst, Cranfield MK43 0AL, Beds, England
[2] Queen Mary Univ London, Dept Mat, Mile End Rd, London E1 4NS, England
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2018年 / 735卷
关键词：
BiCuSeO; Thermoelectric materials; Cs doping; Flux synthesis; Thermal conductivity; THERMAL-STABILITY; OXIDE; OXYSELENIDES; TRANSPORT;
D O I：
10.1016/j.jallcom.2017.11.104
中图分类号：
O64 [物理化学（理论化学）、化学物理学];
学科分类号：
070304 ; 081704 ;
摘要：
The synthesis of BiCuSeO oxyselenides by a flux method in air has been investigated. A maximum power factor of 230 mu Wm(-1)K(-2) and a very low thermal conductivity of 0.42Wm(-1)K(-1) were obtained, leading to a high ZT value of 0.37 at 680 K for pristine BiCuSeO. With Cs doping, a large enhancement in electrical conductivity coupled with a moderate decrease in Seebeck coefficient lead to a power factor of 340 mu Wm(-1)K(-2) at 680 K. In addition, Cs doping reduced the thermal conductivity further to 0.35 Wm(-1)K(-1) at 680 K. The combination of higher power factor and reduced thermal conductivity results in a high ZT value of 0.66 at 680 K for Bi0.995Cs0.005CuSeO. (C) 2017 Elsevier B.V. All rights reserved.
引用
收藏
页码：861 / 869
页数：9
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