Monolayer H-Si-P Semiconductors: Structural stability, electronic structure, optical properties, and Prospects for photocatalytic water splitting

TL;DR

This study predicts and analyzes hydrogenated silicon phosphide monolayers, revealing their stability, tunable electronic properties, and potential for solar energy conversion and photocatalytic water splitting based on first-principles calculations.

Contribution

It systematically investigates the structure and properties of H-Si-P monolayers, highlighting their stability, tunable bandgaps, and application prospects for photocatalysis and nanoelectronics.

Findings

H-Si-P monolayers are stable indirect bandgap semiconductors.

Their bandgaps can be effectively tuned by biaxial strain.

They exhibit excellent potential for solar energy conversion and water splitting.

Abstract

Group IV and V monolayers are the promising state-of-the-art 2D materials owing to their high carrier mobility, tunable bandgaps, and optical linear dichroism along with outstanding electronic and thermoelectric properties. Furthermore, recent studies reveal the stability of free-standing 2D monolayers by hydrogenation. Inspired by this, we systematically predict and investigate the structure and properties of various hydrogen saturated silicon phosphide (H-Si-P) monolayers, based on first-principles calculations. According to the results, H-Si-P monolayers belong to indirect bandgap semiconductors with a highly stable structure. Their bandgaps and band edge positions assessed using accurate hybrid functional are shown to be effectively adjusted by applying a biaxial strain. Furthermore, the absorption spectra of these monolayers, simulated in the context of time-dependent density functional theory, exhibit their excellent potential for solar energy conversion and visible-light-driven photocatalytic water splitting. In this respect, this work provides valuable guidance for finding more 2D semiconductors and nanostructures for nanoelectronic and optoelectronic applications, as well as for photocatalytic water splitting.