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- W2900777066 abstract "Search for two-dimensional (2D) water-splitting photocatalysts is crucial to solve energy crises and environmental problems. In this research, we study the electronic and photocatalytic properties of single-layer Ga2X1X2 (Ga2SeTe, Ga2STe, and Ga2SSe) and newly proposed α-Ga2S3/Ga2SSe-A, α-Ga2S3/Ga2SSe-B, and α-Ga2S3/Ga2SSe-C van der Waals heterojunctions using first-principles calculations. Theoretical results indicate that Ga2X1X2 monolayers present suitable band edges. 2D α-Ga2S3/Ga2SSe-B and α-Ga2S3/Ga2SSe-C belong to type-II heterojunctions and under biaxial strains embody suitable band edges. Comparisons of the valence band maximum charge and electric dipole of α-Ga2S3/Ga2SSe-A and α-Ga2S3/Ga2SSe-B demonstrate that it is possible to achieve suitable band edges for water splitting by switching electric dipoles. Especially, the three Ga2X1X2 monolayers and α-Ga2S3/Ga2SSe-B and α-Ga2S3/Ga2SSe-C heterojunctions absorb a large amount of visible light, thus proving that they are promising photocatalysts for water splitting. More importantly, we find that the optical absorption coefficients of 2D monolayers and heterojunctions in previous calculations are several times underestimated because the effective volume is not taken into consideration. To obtain reliable absorption coefficients, the real and imaginary parts of dielectric function must be renormalized." @default.
- W2900777066 created "2018-11-29" @default.
- W2900777066 creator A5007047259 @default.
- W2900777066 creator A5008825834 @default.
- W2900777066 date "2018-11-16" @default.
- W2900777066 modified "2023-10-16" @default.
- W2900777066 title "Janus Group-III Chalcogenide Monolayers and Derivative Type-II Heterojunctions as Water-Splitting Photocatalysts with Strong Visible-Light Absorbance" @default.
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- W2900777066 doi "https://doi.org/10.1021/acs.jpcc.8b06575" @default.
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