Anharmonicity-induced strong temperature-dependent thermal conductivity in CuInX2 (X=Se, Te)

Yongheng Li, Junyan Liu, Jiawang Hong*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Citations (Scopus)

Abstract

The lattice thermal conductivity(κL) of most single crystals usually follows T-1 temperature dependent relation at high temperature region. Here, we investigate the microscopic mechanism of the significant deviation of κL∼T-1 rule in Cu-based chalcopyrite compounds CuInX2(X=Se, Te) by performing first-principles calculations and solving Peierls-Boltzmann transport equation with phonon anharmonic renormalization. The temperature sensitive second-order force constants lead to the dramatically softened optical phonon bands, which contributes to the enlarged phonon scattering phase space and consequent enhanced scattering rate. The strong temperature dependent thermal conductivity in CuInX2(X=Se, Te) can be well reproduced when calculating thermal conductivity with renormalization force constants. The motion of Cu contributes the most to the large anharmonicity at high temperature, which makes the anharmonic renormalization non-negligible for estimating accurate lattice dynamic and thermal conductivity. Our work will deepen the understanding of thermal transport property of Cu-based chalcopyrite, which is helpful for designing better thermoelectric or photovoltaic devices.

Original languageEnglish
Article number094317
JournalPhysical Review B
Volume106
Issue number9
DOIs
Publication statusPublished - 1 Sept 2022

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