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Silicon diphosphide (SiP2) and silicon diarsenide (SiAs2): Novel stable 2D semiconductors with high carrier mobilities, promising for water splitting photocatalysts by Fazel Shojaei; Bohayra Mortazavi; Xiaoying Zhuang; Maryam Azizi is a Engineering article available to read on EtoBox.

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Two dimensional (2D) semiconducting light absorbers, have recently considered as promising components to improve the efficiency in the photocatalytic hydrogen production via water splitting. In this work, by employing density functional theory computations, we introduced novel SiX 2 (X 1⁄4 P, As) nanosheets in tetragonal (penta-) and orthorhombic (rec-) phases, as promising light absorber semiconductors for overall water splitting. The predicted nanomembranes exhibit good mechanical, dynamical and thermal stabilities. They also show small cleavage energies in the range of 0.31 J/m 2 to 0.39 J/m 2 , comparable to that of the graphene and thus suggesting the feasibility of their experimental exfoliation. Notably, predicted monolayers are semiconductors with indirect band gaps of 2.65 eV for penta-SiP 2 , 2.35 eV for penta-SiAs 2 , 1.89 eV for rec-SiAs 2 , and a direct band gap of 2.21 eV for rec-SiP 2 . These nanomaterials however show relatively large interlayer quantum confinement effects, resulting in smaller band gap values for bilayer lattices. We observed a huge difference between the electron and hole mobilities for penta-SiP 2 and rec-SiAs 2 monolayers and highly directional

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Author

Fazel Shojaei; Bohayra Mortazavi; Xiaoying Zhuang; Maryam Azizi

Published

2020

Language

EN

Field

Engineering (Physical Sciences)