Journal
JOURNAL OF ENERGY CHEMISTRY
Volume 45, Issue -, Pages 83-90Publisher
ELSEVIER
DOI: 10.1016/j.jechem.2019.09.021
Keywords
Cubic GeSe; Alloying; Sb2Te3; Glass-like transport; Thermoelectrics
Funding
- Dalian Institute of Chemical Physics [DICP ZZBS201608]
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Thermoelectric properties of orthorhombic or rhombohedral GeSe have attracted great attention recently, with the rise of its structural analog SnSe. However, the p-type cubic GeSe with higher symmetry and higher valence band degeneracy, which might exhibit higher thermoelectric performance, has never been synthesized. Here we report on the successful synthesis of p-type crystalline cubic GeSe by alloying with Sb2Te3 and the spontaneously formed Ge-vacancies. An unexpected glass-like temperature independent lattice thermal conductivity is observed in crystalline cubic GeSe, which results from strong phonon scattering by vacancy-induced disorders. Combining the multiple scattering theory and chemical bond analysis, we further reveal the existence of Anderson localization induced by Ge-vacancies. The Anderson localization results in a nearly constant Seebeck coefficient with increasing the carrier concentration. These results provide a general insight towards understanding and improving the thermoelectric properties of thermoelectric materials with vacancies and atomic-scale disorders. (C) 2019 Science Press and Dalian Institute of Chemical Physics, Chinese Academy of Sciences. Published by Elsevier B.V. and Science Press. All rights reserved.
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