標題: On Electronic Structure and Geometry of MoX2 (X = S, Se, Te) and Black Phosphorus by ab initio Simulation with Various van der Waals Corrections
作者: Tsai, Yi-Chia
Li, Yiming
電機工程學系
Department of Electrical and Computer Engineering
關鍵字: van der Waals;exchange-correlation functionals;density functional theory;two-dimensional material
公開日期: 1-Jan-2017
摘要: To get an accurate prediction of the geometry and electronic structure of two-dimensional materials, the use of functionals for the exchange-correlation and the van der Waals corrections are consequential. We present a more rigorous simulation procedure by adopting different exchange-correlation functionals for geometry relaxation and electronic structure calculation. As the results, by using Perdew-Burke-Ernzerhof (PBE) functional, the geometry and the bandgap of the bulk transition metals dichalcogenides can be satisfied in comparison with the experimental measurement. It should, however, incorporate the Heyd-Scuseria-Ernzerhof (HSE06) functional and DFT-D2 van der Waals correction at the same time to reproduce a close geometry and bandgap of bulk black phosphorus (BP). A large cell calculation for BP, such as contact engineering and doping engineering, can thus take the advantage of accuracy while remains time efficiency.
URI: http://hdl.handle.net/11536/147094
ISSN: 1946-1569
期刊: 2017 INTERNATIONAL CONFERENCE ON SIMULATION OF SEMICONDUCTOR PROCESSES AND DEVICES (SISPAD 2017)
起始頁: 169
結束頁: 172
Appears in Collections:Conferences Paper