Strain Effects on the 2D van der Waals Heterostructure C3B/C3N: A Density Functional Theory and a Tight‐Binding Study. Issue 5 (19th February 2020)

• Record Type: Journal Article
• Authors: Zhao, Puju; Wan, Yun; Zhang, Sujuan; Gao, Aihua; Guo, Ping; Jiang, Zhenyi; Zheng, Jiming
• Is Part Of: Physica status solidi. Volume 14:Issue 5(2020)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2020-02-19
• Subjects: 2D materials, C3B/C3N heterostructures -- density functional theory calculations -- strains -- tight-binding model -- van der Waals heterostructures; Solid state physics -- Periodicals; 530.4105
• DOI: 10.1002/pssr.202000012
• Languages: English
• ISSNs: 1862-6254

Abstract

Abstract : The 2D van der Waals (vdW) heterostructure C3 B/C3 N is a prototype of the 2D pn junction. To understand the effects of the built‐in electrical field on the properties of this heterostructure and the evolvement of properties under different strain states, the electronic structure of the system is systematically calculated and analyzed, using the first‐principle method and the tight‐binding (TB) Hamiltonian. Two stable structures and two saddle points in the potential surface are identified, between which the potential barriers along different sliding paths are compared. A TB model with 13 parameters is constructed, and it gives a reasonable potential difference when the heterostructure is under different strain states. Moreover, three distinct features are observed, namely the bandgap variation, metal–semiconductor transition, and band inversion under biaxial compressive strain states. By analyzing the work function change and capacitance variation, it is explained as to why the band spectrum changes as observed. This work deepens the understanding of the properties of the 2D vdW heterostructure, especially the effect of the built‐in electrical field on the band spectrum. Abstract : The effects of the built‐in electrical field on the properties of 2D van der Waals heterostructure C3 B/C3 N and the evolvement of its properties under different strain states are systematically investigated using the first‐principle method and the tight‐binding Hamiltonian.