Band Gap of 3D Metal Oxides and Quasi-2D Materials from Hybrid Density Functional Theory: Are Dielectric-Dependent Functionals Superior?

2019 ◽  
Vol 15 (11) ◽  
pp. 6294-6312 ◽  
Author(s):  
Tilak Das ◽  
Giovanni Di Liberto ◽  
Sergio Tosoni ◽  
Gianfranco Pacchioni
Keyword(s):  
Density Functional Theory ◽  
Metal Oxides ◽  
Band Gap ◽  
Density Functional ◽  
2D Materials ◽  
Hybrid Density Functional Theory ◽  
Functional Theory ◽  
Hybrid Density Functional

A Hybrid Density Functional Theory Study of Band Gap Tuning in ZnO through Pressure

2012 ◽  
Vol 29 (11) ◽  
pp. 117104 ◽  
Author(s):  
Bo-Tao Zhao ◽  
Yi-Feng Duan ◽  
Hong-Liang Shi ◽  
Li-Xia Qin ◽  
Li-Wei Shi ◽  
...  
Keyword(s):  
Density Functional Theory ◽  
Band Gap ◽  
Density Functional ◽  
Hybrid Density Functional Theory ◽  
Density Functional Theory Study ◽  
Functional Theory ◽  
Band Gap Tuning ◽  
Hybrid Density Functional

scholarly journals Defects and Strain Engineering of Structural, Elastic, and Electronic Properties of Boron-Phosphide Monolayer: A Hybrid Density Functional Theory Study

Nanomaterials ◽  
2021 ◽  
Vol 11 (6) ◽  
pp. 1395
Author(s):  
Fang-Qiang Li ◽  
Yang Zhang ◽  
Sheng-Li Zhang
Keyword(s):  
Density Functional Theory ◽  
Band Gap ◽  
Electronic Properties ◽  
Plane Strain ◽  
Density Functional ◽  
Hybrid Density Functional Theory ◽  
Biaxial Strain ◽  
Functional Theory ◽  
Boron Phosphide ◽  
Hybrid Density Functional

Defects and in-plane strain have significant effects on the electronic properties of two-dimensional nanostructures. However, due to the influence of substrate and environmental conditions, defects and strain are inevitable during the growth or processing. In this study, hybrid density functional theory was employed to systematically investigate the electronic properties of boron-phosphide monolayers tuned by the in-plane biaxial strain and defects. Four types of defects were considered: B-vacancy (B_v), P-vacancy (P_v), double vacancy (D_v), and Stone–Wales (S-W). Charge density difference and Bader charge analysis were performed to characterize the structural properties of defective monolayers. All of these defects could result in the boron-phosphide monolayer being much softer with anisotropic in-plane Young’s modulus, which is different from the isotropic modulus of the pure layer. The calculated electronic structures show that the P_v, D_v, and S-W defective monolayers are indirect band gap semiconductors, while the B_v defective system is metallic, which is different from the direct band gap of the pure boron-phosphide monolayer. In addition, the in-plane biaxial strain can monotonically tune the band gap of the boron-phosphide monolayer. The band gap increases with the increasing tension strain, while it decreases as the compression strain increases. Our results suggest that the defects and in-plane strain are effective for tuning the electronic properties of the boron-phosphide monolayer, which could motivate further studies to exploit the promising application in electronics and optoelectronics based on the boron-phosphide monolayer.

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