Affiliation:
1. State Key Laboratory of Advanced Processing and Recycling of Non-Ferrous Metal, Department of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Abstract
We use a first-principles calculation to explore the effects of vacancies on structural, electronic and optical properties of [Formula: see text]-[Formula: see text] based on density functional theory (DFT). The results show that after optimization, the Si vacancy system of [Formula: see text]-[Formula: see text] is more difficult to produce than N vacancy system under the same thermodynamic conditions. The band gaps including N vacancy and Si vacancy systems are smaller than that of the perfect crystal. The charge density difference and population analysis show that the bonding near Si vacancy has stronger covalent property, whereas those near nitrogen vacancy have stronger ionic property. For Si vacancy system, the materials have much higher values of the imaginary part of the dielectric constant than those of N vacancies and perfect [Formula: see text]-[Formula: see text]. The maximum value of the Si vacancy system in absorption and reflection spectra is lower than those in different nitrogen vacancy systems.
Funder
National Natural Science Foundation of China
Shenyang National Laboratory for Materials Science and State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals
Publisher
World Scientific Pub Co Pte Lt
Subject
Condensed Matter Physics,Statistical and Nonlinear Physics
Cited by
2 articles.
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