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Issue 21, 2019

Ultralow lattice thermal conductivity induced high thermoelectric performance in the δ-Cu2S monolayer

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Abstract

Motivated by the recent experimental exfoliation of β-Cu2S thin films and the theoretical finding of a new phase labeled the δ-Cu2S monolayer, we carried out extensive studies on thermal conductivity and thermoelectric properties of the new phase using first principles combined with Boltzmann transport theory, focusing on the analysis of group velocities, Gruneisen parameters, three-phonon scattering rates, and the scattering phase space. Our results show that the δ-Cu2S monolayer exhibits an intrinsically ultralow lattice thermal conductivity of 0.10 W m−1 K−1 at 800 K. Such an ultralow lattice thermal conductivity leads to a high thermoelectric figure of merit ZT = 1.33 at 800 K in an optimum p-type doping concentration, which is not only larger than the value of 1.23 in In2S3 doped Cu2S at 850 K but also comparable with the value of 1.7 in Cu1.97S at 1000 K, exhibiting good potential in thermoelectric applications.

Graphical abstract: Ultralow lattice thermal conductivity induced high thermoelectric performance in the δ-Cu2S monolayer

Article information


Submitted
19 Feb 2019
Accepted
01 May 2019
First published
01 May 2019

Nanoscale, 2019,11, 10306-10313
Article type
Paper

Ultralow lattice thermal conductivity induced high thermoelectric performance in the δ-Cu2S monolayer

J. Yu, T. Li, G. Nie, B. Zhang and Q. Sun, Nanoscale, 2019, 11, 10306 DOI: 10.1039/C9NR01501A

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