Title

Improved thermoelectric performance of BiCuSeO by Ag substitution at Cu site

RIS ID

127862

Publication Details

Farooq, M. U., Butt, S., Gao, K., Pang, X. L., Sun, X., Asfandiyar, , Mohmed, F., Ahmad, A., Mahmood, A. & Mahmood, N. (2017). Improved thermoelectric performance of BiCuSeO by Ag substitution at Cu site. Journal Of Alloys And Compounds, 691 572-577.

Abstract

BiCuSeO oxyselenide-based thermoelectric materials are attracting much attention due to their ultra-low intrinsic thermal conductivity (ĸ) and moderate Seebeck coefficient (S). However, the low conversion efficiency limits their application in energy conversion systems. This paper investigated the effect of monovalent Ag-doping in BiCuSeO at Cu site in the presence of polyvinyl alcohol (PVA). The results show that Ag is effectively doped at Cu site. The heavy atom substitution in BiCu1−xAgxSeO at Cu site can enhance S and reduce its total thermal conductivity (k) by phonon scattering. Further, the incorporation of heavy atom (Ag) with different ionic radii results in the improved ZT of 0.64 for BiCu1−xAgxSeO, which is 16% more than that for pure BiCuSeO (ZT = 0.55) at 923 K. It is believed that the Cu site should be an efficient dopant site to improve the efficiency of oxyselenide-based thermoelectric materials.

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Link to publisher version (DOI)

http://dx.doi.org/10.1016/j.jallcom.2016.08.236