A class of two-dimensional SiAs monolayers with novel electronic and optical properties from ab initio investigations

Xinliang Wang; Guangtao Deng; Weiyang Yu; Baoji Wang; Xiaohua Li; Yujin Liu; Yuhuan Zhao; Qin Wang; Liwei Zhang; Xiaolin Cai

doi:10.1140/epjp/i2019-12643-9

EPJ

A class of two-dimensional SiAs monolayers with novel electronic and optical properties from ab initio investigations

Xinliang Wang¹^,2, Guangtao Deng³^*, Weiyang Yu¹^,4, Baoji Wang¹, Xiaohua Li¹, Yujin Liu¹, Yuhuan Zhao¹, Qin Wang¹, Liwei Zhang¹ and Xiaolin Cai¹^,4

¹ School of Physics and Electronic Information Engineering, Henan Polytechnic University, 454000, Jiaozuo, China
² Hami Yuxin Energy Industry Research Institute Co., Ltd., 839000, Hami, China
³ School of Energy Science and Engineering, Henan Polytechnic University, 454000, Jiaozuo, China
⁴ International Laboratory for Quantum Functional Materials of Henan and School of Physics and Engineering, Zhengzhou University, 450001, Zhengzhou, China

Received: 20 September 2018
Accepted: 19 March 2019
Published online: 25 June 2019

Abstract

Exploring new 2D monolayer materials with intrinsic novel properties is of great significance from both fundamental and practical points of view. Using first-principles calculations based on density functional theory, we propose three stable hexagonal SiAs monolayers with the excellent thermal and dynamic stabilities, whose crystal structures are similar to the monolayer GaSe, named $\alpha$ -, $\beta$ - and $\gamma$ -SiAs, respectively. Our results show that $\alpha$ - and $\beta$ -SiAs monolayers are wide-band-gap semiconductors with indirect band gaps, which have great potential applications in photoelectronic devices, especially used for catalytic splitting water. Further, the effective masses of electron transport in monolayers $\alpha$ - and $\beta$ -SiAs exhibit anisotropic characteristics. Intriguingly, $\gamma$ -SiAs is a direct band gap semiconductor with a band gap of 1.13eV as bulk silicon, which results in a significant absorption in the visible-light region. More importantly, the effective masses in the $\gamma$ -SiAs monolayer are only a little larger than 0.20 m₀, indicating that it may have high carrier mobility. Our findings provide three promising candidates for low-dimensional nanodevices with excellent performances in the future.

15th European Conference on Atoms Molecules and Photons (ECAMP)
June 30 to July 4, 2025
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EPJ

A class of two-dimensional SiAs monolayers with novel electronic and optical properties from ab initio investigations

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