Issue 11, 2023

Two Janus Ga2STe monolayers and their electronic, optical, and photocatalytic properties

Abstract

Recently, two-dimensional Janus materials have attracted increasing interest due to their unique structure and novel properties. Based on density-functional and many-body perturbation theories (i.e. DFT + G0W0 + BSE methods), the electronic, optical, and photocatalytic properties of Janus Ga2STe monolayers with two configurations are explored systematically. It is found that the two Janus Ga2STe monolayers exhibit high dynamical and thermal stabilities and have desirable direct gaps of about 2 eV at the G0W0 level. Their optical absorption spectra are dominated by the enhanced excitonic effects, in which bright bound excitons possess moderate binding energies of about 0.6 eV. Most interestingly, Janus Ga2STe monolayers show high light absorption coefficients (larger than 106 cm−1) in the visible light region, effective spatial separation of photoexcited carriers, and suitable band edge positions, which make them potential candidates for photoelectronic and photocatalytic devices. These observed findings enrich the deep understanding of the properties of Janus Ga2STe monolayers.

Graphical abstract: Two Janus Ga2STe monolayers and their electronic, optical, and photocatalytic properties

Supplementary files

Article information

Article type
Paper
Submitted
05 Jan 2023
Accepted
17 Feb 2023
First published
20 Feb 2023

Phys. Chem. Chem. Phys., 2023,25, 7937-7945

Two Janus Ga2STe monolayers and their electronic, optical, and photocatalytic properties

H. Shu, Phys. Chem. Chem. Phys., 2023, 25, 7937 DOI: 10.1039/D3CP00070B

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