Electronic and optical properties of two-dimensional heterostructures based on Janus XSSe (X = Mo,W) and Mg(OH)2: a first principles investigation |
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| Authors: | Junbin Lou Kai Ren Zhaoming Huang Wenyi Huo Zhengyang Zhu Jin Yu |
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| Institution: | School of Information Science and Engineering, Jiaxing University, Jiaxing Zhejiang China ; School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing Jiangsu China.; School of Mechanical Engineering, Wanjiang University of Technology, Maanshan Anhui China ; School of Materials Science and Engineering, Southeast University, Nanjing Jiangsu China |
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| Abstract: | Two-dimensional (2D) materials have attracted numerous investigations after the discovery of graphene. 2D van der Waals (vdW) heterostructures are a new generation of layered materials, which can provide more desirable applications. In this study, the first principles calculation was implemented to study the heterostructures based on Janus TMDs (MoSSe and WSSe) and Mg(OH)2 monolayers, which were constructed by vdW interactions. Both MoSSe/Mg(OH)2 and WSSe/Mg(OH)2 vdW heterostructures have thermal and dynamic stability. Besides, XSSe/Mg(OH)2 (X = Mo, W) possesses a direct bandgap with a type-I band alignment, which provides promising applications for light-emitting devices. The charge density difference was investigated, and 0.003 (or 0.0042) |e| were transferred from MoSSe (or WSSe) layer to Mg(OH)2 layer, and the potential drops were calculated to be 11.59 and 11.44 eV across the interface of the MoSSe/Mg(OH)2 and WSSe/Mg(OH)2 vdW heterostructures, respectively. Furthermore, the MoSSe/Mg(OH)2 and WSSe/Mg(OH)2 vdW heterostructures have excellent optical absorption wave. Our studies exhibit an effective method to construct new heterostructures based on Janus TMDs and develop their applications for future light emitting devices.Two-dimensional (2D) materials have attracted numerous investigations after the discovery of graphene. |
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