Phase-transition temperature suppression to achieve cubic GeTe and high thermoelectric performance by Bi and Mn codoping
Abstract
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.
Document Details
- Document Type
- Pub Defense Publication
- Publication Date
- May 07, 2018
- Source ID
- 10.1073/pnas.1802020115
Entities
People
- Ching-Wu Chu
- David J. Singh
- Hangtian Zhu
- Jiehe Sui
- Jifeng Sun
- Jingchao Zhou
- Jun Mao
- Wuyang Ren
- Zhifeng Ren
- Zhiming Wang
- Zihang Liu
Organizations
- Air Force Office of Scientific Research
- Harbin Institute of Technology
- National Natural Science Foundation of China
- United States Department of Energy
- University of Electronic Science and Technology of China
- University of Houston
- University of Missouri