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Intrinsically low thermal conductivity in a p-type semiconductor SrOCuBiSe2 with a [SrO]-intercalated CuBiSe2 structure

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Abstract

Designing new semiconductors with an extremely low thermal conductivity is of considerable significance. In this study, we successfully synthesized a new semiconductor SrOCuBiSe2 with an intrinsically low thermal conductivity via the molten salt method. It possesses a typical multicomponent layered structure which is composed of alternatively stacked [CuBiSe2] (electronic conduction unit, ECU) and [SrO] (electronic insulation unit, EIU) layers. Its intrinsically low thermal conductivity (κ = 0.45 W m−1 K−1 at 700 K) is attributed to the dual effects of high atomic displacement parameter and extremely large Grüneisen parameter, which are caused by rattling vibration of Cu atoms and lone-pair electrons of Bi atoms, respectively. Such knowledge highlights the importance of lone-pair electrons in impelling the phonon anharmonicity and multicomponent structure design concept, providing a stepping stone to the design of new semiconductors with a low thermal conductivity.

Graphical abstract: Intrinsically low thermal conductivity in a p-type semiconductor SrOCuBiSe2 with a [SrO]-intercalated CuBiSe2 structure

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Article information


Submitted
02 Jan 2020
Accepted
05 Mar 2020
First published
05 Mar 2020

Chem. Commun., 2020, Advance Article
Article type
Communication

Intrinsically low thermal conductivity in a p-type semiconductor SrOCuBiSe2 with a [SrO]-intercalated CuBiSe2 structure

M. Luo, K. Bu, X. Zhang, J. Huang, R. Wang and F. Huang, Chem. Commun., 2020, Advance Article , DOI: 10.1039/D0CC00035C

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