Issue 9, 2023

Theoretical determination of superior high-temperature thermoelectricity in an n-type doped 2H-ZrI2 monolayer

Abstract

Two-dimensional materials with a competitive figure of merit zT are extremely desirable for the fabrication of thermoelectric modules. In the present work, we systematically evaluated the thermoelectricity of monolayer 2H-ZrI2 through first-principles calculations and semiclassical Boltzmann transport theory. Apart from its all-round structural stability and feasibility of experimental preparation, the semiconducting material with a moderate indirect bandgap of 1.07 eV at the HSE06 level exhibits an acceptable lattice thermal conductivity κL of 6.69 W m−1 K−1 at 900 K contributed dominantly by acoustic modes. The four-phonon scattering is found to exert a minor effect on the κL of the monolayer. Moreover, a quite large power factor of up to 147.89 mW m−1 K−2 can be achieved due to the conduction band valley degeneracy near the Fermi level. These transport coefficients eventually give rise to a significant optimal n-type zT value as high as 3.57 at 900 K at a certain experimentally achievable electron doping concentration. Our study demonstrates the potential application of monolayer 2H-ZrI2 in high-temperature thermoelectric devices.

Graphical abstract: Theoretical determination of superior high-temperature thermoelectricity in an n-type doped 2H-ZrI2 monolayer

Supplementary files

Article information

Article type
Paper
Submitted
30 Oct 2022
Accepted
11 Jan 2023
First published
11 Jan 2023

Nanoscale, 2023,15, 4397-4407

Theoretical determination of superior high-temperature thermoelectricity in an n-type doped 2H-ZrI2 monolayer

J. Wen, J. Peng, B. Zhang and Z. Wang, Nanoscale, 2023, 15, 4397 DOI: 10.1039/D2NR06054J

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