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Effects of Antisite Defect Density on Crystal and Electronic Structures of Monolayer Hexagonal Boron Nitride
Author(s) -
Ding Yifan,
Yang Junkai,
Wang Huaixiang,
Ji Yu,
Guo Qinwen,
Wang Weipeng,
Shen Xi,
Yao Yuan,
Yu Richeng
Publication year - 2021
Publication title -
physica status solidi (rrl) – rapid research letters
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.786
H-Index - 68
eISSN - 1862-6270
pISSN - 1862-6254
DOI - 10.1002/pssr.202100216
Subject(s) - materials science , supercell , monolayer , density functional theory , atomic orbital , boron nitride , dopant , atom (system on chip) , hexagonal boron nitride , condensed matter physics , electronic structure , boron , crystallography , molecular physics , electron , computational chemistry , nanotechnology , chemistry , doping , optoelectronics , thunderstorm , oceanography , physics , graphene , quantum mechanics , organic chemistry , geology , computer science , embedded system
The effect of antisite defects and their density on monolayer hexagonal boron nitride is discussed in detail. Different supercell sizes to simulate different defect densities are set up. All structures containing antisites are fully optimized. It is indicated that the high density of antisite defects leads to the instability of the BB bond. The influence of supercell size on lattice structure is also summarized. Like vacancies and dopant atoms, the antisite defects also lead to the appearance of the defect energy band. Different antisite defect densities have different effects on different orbitals. Electron energy‐loss spectroscopy theoretical simulation is conducted on a single atom to analyze the influence of antisite defect density on the electronic structure of a single atom. It is shown that the high density of antisite defects makes the σ * transition of B atoms that are far away from the defect more preferred than π * transition, while it has less influence on the transition of central N atoms of the antisite defect N B because of the influence of neighboring atoms. The concentration of antisite defects plays a key role in manipulating the physical properties of monolayer hexagonal boron nitride and is helpful in expanding potential application scenarios.