Enhanced visible-light-driven photocatalytic activity in SiPGaS/arsenene-based van der Waals heterostructures
| Autor: | Anwar Ali, Ismail Shahid, Iqtidar Ahmad, Bin Lu, Haitao Zhang, Wen Zhang, Ping Kwan Johnny Wong |
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| Jazyk: | angličtina |
| Rok vydání: | 2023 |
| Předmět: | |
| Zdroj: | iScience, Vol 26, Iss 10, Pp 108025- (2023) |
| Druh dokumentu: | article |
| ISSN: | 2589-0042 79024211 |
| DOI: | 10.1016/j.isci.2023.108025 |
| Popis: | Summary: Van der Waals heterostructures (vdWHs) showcase robust and tunable light-matter interactions, establishing an intriguing realm for investigating atomic-scale photocatalytic properties. Here, we employ ab initio methods to study the photocatalytic and optical properties of semiconducting SiPGaS/arsenene-based vdWHs with a type-II band alignment. Across the heterointerfaces, there exists significant built-in electric fields and large potential drop, in turn facilitating the spatial separation of photo-generated electron-hole pairs. These vdWHs further possess high carrier mobility in the order of 102 cm2V⁻1S⁻1, which combining with appropriate band edge positions, endow the vdWHs an absorption coefficient of ∼10⁵ cm⁻1 to harvest a maximal portion of the solar spectrum for visible-light-driven photocatalytic applications. Our findings also reveal transition of the type-II band alignment in a type-III configuration via compressive strain for tunneling field-effect transistor application. Furthermore, both types of vdWHs exhibit enhanced suitability for photocatalysis under conditions with a pH of 2. |
| Databáze: | Directory of Open Access Journals |
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