Abstract
The two-dimensional (2D) semiconductor material of InSe has received much attention due to its excellent electrical properties and moderate adjustable bandgap. The vacancy defects in the material affect not only the optical and electrical properties, but also the environmental stability. Compared with other phases in InSe materials, <i>δ</i>-InSe has superior material properties, however, the effect of environment on this material stabilityhas not been reported. In this work, we systematically investigate the stability of 2D <i>δ</i>-InSe material under oxygen environment based on density functional theory. The results are shown below. Firstly, in an oxygen environment, the perfect <i>δ</i>-InSe surface exhibits good inertness and stability, for O<sub>2</sub> molecules need to overcome an exceptionally high energy barrier of 1.827 eV from physical adsorption to chemical adsorption on its surface. Secondly, the presence of Se vacancies (V<sub>Se</sub>) promotes the oxidation reaction of <i>δ</i>-InSe, which only requires overcoming a low energy barrier of 0.044 eV. This suggests that the stability of <i>δ</i>-InSe in an oxygen environment is significantly reduced because of the presence of V<sub>Se</sub>. The O<sub>2</sub> molecules oxidized <i>δ</i>-InSe monolayer is beneficial to the dissociation and adsorption of H<sub>2</sub>O molecules. Finally, the oxidation rate of <i>δ</i>-InSe with In vacancies (V<sub>In</sub>) is slower, with the adsorption energy and charge transfer involved in the physical adsorption of O<sub>2</sub> molecules on the V<sub>In</sub> surface being similar to those on a perfect surface. The oxidation process needs to overcome a higher energy barrier of 1.234 eV. The findings of this study will provide theoretical guidance for better understanding the oxidation behavior of single vacancy defects in monolayer <i>δ</i>-InSe, and reference for experimental preparation of high-reliability 2D <i>δ</i>-InSe devices.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
