Phase-transition temperature suppression to achieve cubic GeTe and high thermoelectric performance by Bi and Mn codoping
Zihang LiuDepartment of Physics, University of Houston, Houston, TX 77204-5005;Jifeng SunDepartment of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211;Jun MaoDepartment of Physics, University of Houston, Houston, TX 77204-5005;Hangtian ZhuDepartment of Physics, University of Houston, Houston, TX 77204-5005;Wuyang RenDepartment of Physics, University of Houston, Houston, TX 77204-5005;Jingchao ZhouDepartment of Physics, University of Houston, Houston, TX 77204-5005;Zhiming WangInstitute of Fundamental and Frontier Sciences, University of Electronic Science and Technology of China, 610054 Chengdu, ChinaDavid J. SinghDepartment of Physics and Astronomy, University of Missouri-Columbia, Columbia, MO 65211;Jiehe SuiState Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, 150001 Harbin, China;C. W. ChuDepartment of Physics, University of Houston, Houston, TX 77204-5005;Zhifeng RenDepartment of Physics, University of Houston, Houston, TX 77204-5005;
2018en
ABI
Abstract
Significance Phase-transition behavior in thermoelectric materials is detrimental for their application in thermoelectric devices. Here we designed, and experimentally realized the high thermoelectric performance of cubic GeTe-based material by suppressing the phase transition from a cubic to a rhombohedral structure to below room temperature through a simple Bi and Mn codoping on the Ge site. Bi doping reduced the hole concentration while Mn alloying largely suppressed the phase-transition temperature and also induced modification of the valence bands. Our work provides the basis for studying phase transitions in other thermoelectric materials to optimize these materials for applications.
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