Tailoring the Carrier and Phonon Scattering to Enhanced Thermoelectric Performance of SnTe by Cation-Anion Codoping with Eco-Benign Cal2

被引：25

作者：

Li, Sihui ^{[1
]}

Yang, Junyou ^{[1
]}

Xin, Jiwu ^{[1
]}

Jiang, Qinghui ^{[1
]}

Zhou, Zhiwei ^{[1
]}

Hu, Huishan ^{[1
]}

Sun, Bingyang ^{[1
]}

Basit, Abdul ^{[1
]}

Li, Xin ^{[1
]}

机构：

[1] Huazhong Univ Sci & Technol, State Key Lab Mat Proc & Die & Mould Technol, Wuhan 430074, Peoples R China

来源：

ACS APPLIED ENERGY MATERIALS | 2019年 / 2卷 / 03期

基金：

中国国家自然科学基金;

关键词：

thermoelectrics; tin telluride; calcium iodide; band convergence; dislocations; carrier and phonon scattering; VALENCE-BAND; THERMAL-CONDUCTIVITY; TRANSPORT-PROPERTIES; EFFICIENCY;

D O I：

10.1021/acsaem.8b02096

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：

In this work, earth abundant Call compound has been applied to regulate the thermoelectric performance of SnTe by codoping in both the anion and cation sites for the first time. The carrier concentration has been effectively tuned to a reasonable range due to the electron donor nature of I-Te(+) point defects; on the other hand, the Seebeck coefficient has been significantly enhanced because of the resulted valence band convergence and band gap enlargement. More importantly, the phonon and carrier scattering have been tailored tactically, and a relatively high power factor with a significantly lowered thermal conductivity have been achieved simultaneously. In consequence, an enhanced figure of merit ZT similar to 1.2 at 873 K was attained in the SnTe-3% CaI2 sample.

引用

页码：1997 / 2003

页数：13