A first principles study of structural and optoelectronic properties and photocatalytic performance of GeC-MX (M = Mo and W; X = S and Se) van der Waals heterostructures

• Published in: Physical chemistry chemical physics : PCCP Vol. 25; no. 16; pp. 11169 - 11175
• Main Authors: Wahab, Tahir, Wang, Yun, Cammarata, Antonio
• Format: Journal Article
• Published: 26.04.2023
• ISSN: 1463-9076; 1463-9084
• DOI: 10.1039/d3cp00398a

Two-dimensional (2D) materials have received enormous attention as photocatalysts for hydrogen production to address the worldwide energy crisis. In this study, we employed first-principles computations to systematically investigate the structural, opto-electronic, and photocatalytic properties of novel GeC-MX 2 (M = Mo, W, X = S, Se) van der Waals (vdW) heterostructures for photocatalysis applications. Our results reveal that the GeC-MX 2 heterostructures can absorb visible light. The type-II band alignment in GeC-MoS 2 and GeC-WS 2 enables the photogenerated electron-hole pairs to be separated continuously. The electron transfer from the GeC monolayer to MX 2 monolayer leads to a large built-in electric field at the interface. This induced electric field is essential for preventing the recombination of photogenerated charges. Moreover, the band-edge locations suggest that GeC-MX 2 heterostructures can be utilized as a photocatalyst for water splitting. Finally, the opto-electronic properties of these novel GeC-MX 2 heterostructures facilitate their practical utilization in future photocatalysis applications. Two-dmensional (2D) materials have received enormous interest as photocatalysts for hydrogen production to address the worldwide energy crisis.