中国物理B ›› 2018, Vol. 27 ›› Issue (5): 57101-057101.doi: 10.1088/1674-1056/27/5/057101

• CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES • 上一篇    下一篇

Effect of pressure on the elastic properties and optoelectronic behavior of Zn4B6O13: First-principles investigation

Pei-Da Wang(王培达), Zhen-Yuan Jia(贾镇源), Yu-Han Zhong(钟玉菡), Hua-Yue Mei(梅华悦), Chun-Mei Li(李春梅), Nan-Pu Cheng(程南璞)   

  1. Faculty of Materials and Energy, Southwest University, Chongqing 400715, China
  • 收稿日期:2017-11-08 修回日期:2018-01-18 出版日期:2018-05-05 发布日期:2018-05-05
  • 通讯作者: Nan-Pu Cheng E-mail:cheng_np@swu.edu.cn
  • 基金资助:
    Project supported by the National Natural Science Foundation of China (Grant No.51171156).

Effect of pressure on the elastic properties and optoelectronic behavior of Zn4B6O13: First-principles investigation

Pei-Da Wang(王培达), Zhen-Yuan Jia(贾镇源), Yu-Han Zhong(钟玉菡), Hua-Yue Mei(梅华悦), Chun-Mei Li(李春梅), Nan-Pu Cheng(程南璞)   

  1. Faculty of Materials and Energy, Southwest University, Chongqing 400715, China
  • Received:2017-11-08 Revised:2018-01-18 Online:2018-05-05 Published:2018-05-05
  • Contact: Nan-Pu Cheng E-mail:cheng_np@swu.edu.cn
  • Supported by:
    Project supported by the National Natural Science Foundation of China (Grant No.51171156).

摘要: The hydrostatic-pressure-dependent mechanical stability and optoelectronic behavior of Zn4B6O13 (ZBO) are calculated using the exchange-correlation functional Perdew-Burke-Ernzerhof generalized gradient approximation and the hybrid functional PBE0 based on density functional theory. The calculated and experimental unit cell volumes and Vickers hardness of ZBO at zero pressure agree well. ZBO is mechanically stable under the critical pressure of 52.98 GPa according to the generalized stability criteria. Furthermore, Young's modulus and Vickers hardness decrease with increasing hydrostatic pressure. The strength and type of ZBO bonds are investigated by population and electron density difference. The electronic structure at zero pressure reveals that ZBO is an indirect band gap semiconductor, and the calculated 5.62-eV bandgap coincides well with the 5.73-eV experimental value, highlighting the success of the hybrid functional PBE0 calculations of electronic properties. The band gap almost increases as a second-order polynomial of pressure, and the indirect nature does not change with the applied external pressure. The optical reflectivity and absorption coefficient show that ZBO is an excellent ultraviolet photodetector. Our calculation results suggest that the elastic and optical properties of ZBO are highly stable over a wide pressure range.

关键词: Zn4B6O13 crystal, density functional theory, elastic properties, optical properties

Abstract: The hydrostatic-pressure-dependent mechanical stability and optoelectronic behavior of Zn4B6O13 (ZBO) are calculated using the exchange-correlation functional Perdew-Burke-Ernzerhof generalized gradient approximation and the hybrid functional PBE0 based on density functional theory. The calculated and experimental unit cell volumes and Vickers hardness of ZBO at zero pressure agree well. ZBO is mechanically stable under the critical pressure of 52.98 GPa according to the generalized stability criteria. Furthermore, Young's modulus and Vickers hardness decrease with increasing hydrostatic pressure. The strength and type of ZBO bonds are investigated by population and electron density difference. The electronic structure at zero pressure reveals that ZBO is an indirect band gap semiconductor, and the calculated 5.62-eV bandgap coincides well with the 5.73-eV experimental value, highlighting the success of the hybrid functional PBE0 calculations of electronic properties. The band gap almost increases as a second-order polynomial of pressure, and the indirect nature does not change with the applied external pressure. The optical reflectivity and absorption coefficient show that ZBO is an excellent ultraviolet photodetector. Our calculation results suggest that the elastic and optical properties of ZBO are highly stable over a wide pressure range.

Key words: Zn4B6O13 crystal, density functional theory, elastic properties, optical properties

中图分类号:  (Semiconductor compounds)

  • 71.20.Nr
71.15.Mb (Density functional theory, local density approximation, gradient and other corrections) 62.20.-x (Mechanical properties of solids) 78.20.-e (Optical properties of bulk materials and thin films)