Structural, electronic and thermoelectric properties of LiAlX 2 (X=S and Se) chalcopyrites: promising for thermoelectric power generators

Chalcogenide Letters

article

J. Kumari¹  C. Singh²  R. Agrawal³  B. L. Choudhary¹  A. S. Verma⁴ 

[1] Department of Physics;Department of Physics, Agra College;Department of Computer Engineering and Applications, G. L. A. University;Division of Research & Innovation, School of Applied and Life Sciences, Uttaranchal University;University Centre for Research & Development, Department of Physics, Chandigarh University

关键词: Chalcopyrites;    Band gap;    Seebeck coefficient;    Figure of merit;   

DOI  :  10.15251/CL.2023.201.73

学科分类：物理（综合）

来源: Forum of Chalcogeniders

【 摘 要 】

Herein, we have inquired the structural, electronic and thermoelectric properties of the couple of chalcopyrite structured solids LiAlX2 (X=S and Se) with the help of density functional theory (DFT), which is tracked by resolution of the Boltzmann transport equation with the constant relaxation time calculations. The LDA (Localized Density Approximation), PBE (Perdew-Burke-Ernzerhof), PBEsol (PBE functional revised for solids) and WC (Wu-Cohen) exchange correlation potentials have been used. The calculated lattice constants a = 5.271 Å; c = 10.178 Å and a = 6.226 Å; c = 12.165 Å for LiAlS2 and LiAlSe2 respectively and the band gap of the mentioned compounds are found in range from 1.74 eV to 3.13 eV. The dependency of thermoelectric parameters are calculated with different temperature (300-800K) and carrier concentration 1018 1019 cm-3 . From the study of ZT (figure of merit’s ZT= S2 σT/κ the dimensionless parameter) and it is found that it’s value for both the compounds in n-type as well as in p-type region is ‘unity’. Since these compounds can be the promising candidate for thermoelectric devices also these compounds are non-toxic, eco-friendly and good alternative for the green and renewable source of electric power generators.

【 授权许可】

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