Enhanced thermoelectric properties of Bi2O2Se ceramics by Bi deficiencies

Tao Wei, Bin Xu () and Xinsheng Ji
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Tao Wei: Henan University of Engineering, Computer College
Bin Xu: North China University of Water Resources and Electric Power
Xinsheng Ji: National Digital Switching System Engineering & Technological R&D Center

The European Physical Journal B: Condensed Matter and Complex Systems, 2019, vol. 92, issue 1, 1-5

Abstract: Abstract The electronic structure and the thermoelectric properties of Bi2−xO2Se (x = 0, 1/4, 1/8, 1/16, 1/32, 1/36, 1/54 and 1/64) are studied by the first principles and the semiclassical BoltzTraP theory. It is found that the energy band gaps increase with increasing x. The calculated total density of states (TDOS) near the Fermi level and bandwidth are influenced by the applied defect. The S values of Bi2−xO2Se are much larger than Bi2O2Se at the same n, due to the much larger TDOS of Bi2−xO2Se. σ∕τ of p-type Bi2−xO2Se are larger than that of the n-type ones, due to the larger TDOS on the top of the valence band (VB). κ0of p-type doping is higher than that of n-type doping. ZeT can be increased by Bi deficiency. Graphical abstract

Keywords: Solid; State; and; Materials (search for similar items in EconPapers)
Date: 2019
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DOI: 10.1140/epjb/e2018-90238-x

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