SiP monolayers: New 2D structures of group IV-V compounds for visible-light photohydrolytic catalysts

Abstract

Because of graphene and phosphorene, two-dimensional (2D) layered materials of group IV and group V elements arouse great interest. However, group IV–V monolayers have not received due attention. In this work, three types of SiP monolayers were computationally designed to explore their electronic structure and optical properties. Computations confirm the stability of these monolayers, which are all indirect-bandgap semiconductors with bandgaps in the range 1.38–2.21 eV. The bandgaps straddle the redox potentials of water at pH= 0, indicating the potential of the monolayers for use as watersplitting photocatalysts. The computed optical properties demonstrate that certain monolayers of SiP 2D materials are absorbers of visible light and would serve as good candidates for optoelectronic devices.

Keywords

graphene / phosphorene / group IV-V monolayers / photocatalytic water splitting / SiP 2D materials

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