Influence of strain on anisotropic thermoelectric transport of   Bi$_2$Te$_3$ and Sb$_2$Te$_3$

N. F. Hinsche; B. Yu. Yavorsky; I. Mertig; and P. Zahn

arXiv:1108.1304·cond-mat.mtrl-sci·October 31, 2011

Influence of strain on anisotropic thermoelectric transport of Bi$_2$Te$_3$ and Sb$_2$Te$_3$

N. F. Hinsche, B. Yu. Yavorsky, I. Mertig, and P. Zahn

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TL;DR

This study uses first-principles calculations and Boltzmann transport theory to analyze how strain affects the anisotropic thermoelectric properties of Bi2Te3 and Sb2Te3, revealing stability in thermopower anisotropy and strain-dependent power factors.

Contribution

It provides new insights into the strain-dependent thermoelectric transport anisotropy of Bi2Te3 and Sb2Te3, highlighting the robustness of thermopower anisotropy and the impact of strain on power factors.

Findings

01

Power factor decreases under in-plane strain for Bi2Te3.

02

Power factor remains stable for Sb2Te3 under strain.

03

Thermopower anisotropy is nearly unaffected by strain.

Abstract

On the basis of detailed first-principles calculations and semi-classical Boltzmann transport, the anisotropic thermoelectric transport properties of Bi $_{2}$ Te $_{3}$ and Sb $_{2}$ Te $_{3}$ under strain were investigated. It was found that due to compensation effects of the strain dependent thermopower and electrical conductivity, the related powerfactor will decrease under applied in-plane strain for Bi $_{2}$ Te $_{3}, w hi l e b e in g s t ab l e f or S b$ _2 $T e$ _3 $. A c l e a r p r e f er e n ce f or t h er m oe l ec t r i c t r an s p or t u n d er h o l e - d o p in g, a s w e l l a s f or t h e in - pl an e t r an s p or t d i r ec t i o n w a s f o u n df or b o t h t e l l u r i d es . I n co n t r a s tt o t h ee l ec t r i c a l co n d u c t i v i t y ani so t r o p y, t h e ani so t r o p y o f t h e t h er m o p o w er w a s a l m os t r o b u s t u n d er a ppl i e d s t r ain . T h e a ss u m pt i o n o f anani so t r o p i cr e l a x a t i o n t im e f or B i$ _2 $T e$ _3$ suggests, that already in the single crystalline system strong anisotropic scattering effects should play a role.

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