Anomalous thermoelectricity in strained Bi2Te3 films

被引：13

作者：

Liu, Yucong ^{[1
,2
]}

Chen, Jiadong ^{[1
,3
]}

Deng, Huiyong ^{[1
]}

Hu, Gujin ^{[1
]}

Zhu, Daming ^{[4
]}

Dai, Ning ^{[1
,5
]}

机构：

[1] Chinese Acad Sci, Shanghai Inst Tech Phys, Natl Lab Infrared Phys, Shanghai 200083, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Changzhou Inst Optoelect Technol, Changzhou 213164, Peoples R China

[4] Univ Missouri Kansas City, Dept Phys, Kansas City, MO 64110 USA

[5] Jiangsu Collaborat Innovat Ctr Photovolat Sci & E, Changzhou 213164, Peoples R China

来源：

SCIENTIFIC REPORTS | 2016年 / 6卷

基金：

中国国家自然科学基金; 上海市自然科学基金;

关键词：

BISMUTH TELLURIDE; ELECTRICAL-RESISTIVITY; PIEZOELECTRICITY; POWER; PERFORMANCE; GROWTH;

D O I：

10.1038/srep32661

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Bi2Te3-based alloys have been intensively used for thermoelectric coolers and generators due to their high Seebeck coefficient S. So far, efforts to improve the S have been made mostly on changing the structures and components. Herein, we demonstrate an anomalous thermoelectricity in strained Bi2Te3 films, i.e., the value of S is obviously changed after reversing the direction of temperature gradient. Further theoretical and experimental analysis shows that it originates from the coupling of thermoelectric and flexoelectric effects caused by a stress gradient. Our finding provides a new avenue to adjust the S of Bi2Te3-based thermoelectric materials through flexoelectric polarization.

引用

页数：7

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