Issue 11, 2023

Electrostatic modulation of thermoelectric transport properties of 2H-MoTe2

Abstract

Two-dimensional layered transition metal dichalcogenides are potential thermoelectric candidates with application in on-chip integrated nanoscale cooling and power generation. Here, we report a comprehensive experimental and theoretical study on the in-plane thermoelectric transport properties of thin 2H-MoTe2 flakes prepared in field-effect transistor geometry to enable electrostatic gating and modulation of the electronic properties. The thermoelectric power factor is enhanced by up to 45% using electrostatic modulation. The in-plane thermal conductivity of 9.8 ± 3.7 W m−1 K−1 is measured using the heat diffusion imaging method in a 25 nm thick flake. First-principles calculations are used to obtain the electronic band structure, phonon band dispersion, and electron–phonon scattering rates. The experimental electronic properties are in agreement with theoretical results obtained within energy-dependent relaxation time approximation. The thermal conductivity is evaluated using both the relaxation time approximation and the full iterative solution to the phonon Boltzmann transport equation. This study establishes a framework to quantitively compare first-principle-based calculations with experiments in 2D layered materials.

Graphical abstract: Electrostatic modulation of thermoelectric transport properties of 2H-MoTe2

Supplementary files

Article information

Article type
Paper
Submitted
03 júl 2023
Accepted
06 sep 2023
First published
27 sep 2023
This article is Open Access
Creative Commons BY license

Energy Adv., 2023,2, 1882-1892

Electrostatic modulation of thermoelectric transport properties of 2H-MoTe2

T. Zhu, S. S. Das, S. Nayeb Sadeghi, F. F. Tonni, S. Krylyuk, C. Constantin, K. Esfarjani, A. V. Davydov and M. Zebarjadi, Energy Adv., 2023, 2, 1882 DOI: 10.1039/D3YA00316G

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