Structural, electronic and thermoelectric properties of LiAlX2 (X=S and Se) chalcopyrites: promising for thermoelectric power generators

Abstract

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.

Thermodynamic properties of chalcogenide and pnictide ternary tetrahedral semiconductors

“…Here ∑ is taken over all the bonds in the compound. Several compounds semiconductors were investigated by Phillips [20,21], and a modified relation was proposed 2 (3)…”

“…Where C is covalent contribution. According to Mulokozi the value of Ae 2 (ΔX) 2 and C depends upon cation.…”

“…Many years before the discovery of semiconduction in elements, chalcopyrite itself was known. Various nonlinear frequency mixing interactions and optoelectronic devices have been demonstrated using the chalcopyrites [1,2]. As a result of their useful design parameters, such as their nonlinear coefficient, appropriate energy band-gap, and birefringence, chalcopyrite crystals have been well established [3,4].…”