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Chin. Phys. B, 2014, Vol. 23(10): 107102    DOI: 10.1088/1674-1056/23/10/107102
CONDENSED MATTER: ELECTRONIC STRUCTURE, ELECTRICAL, MAGNETIC, AND OPTICAL PROPERTIES Prev   Next  

Electronic structure and optical properties of MgxZn1-xS bulk crystal using first-principles calculations

Yu Zhi-Qiang (余志强), Xu Zhi-Mou (徐智谋), Wu Xing-Hui (武兴会)
Wuhan National Laboratory for Optoelectronics, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
Abstract  We perform the first-principles calculations within the framework of density functional theory to determine the electronic structure and optical properties of MgxZn1-xS bulk crystal. The results indicate that the electronic structure and optical properties of MgxZn1-xS bulk crystal are sensitive to the Mg impurity composition. In particular, the MgxZn1-xS bulk crystal displays a direct band structure and the band gap increases from 2.05 eV to 2.91 eV with Mg dopant composition value x increasing from 0 to 0.024. The S 3p electrons dominate the top of valence band, while the Zn 4s electrons and Zn 3p electrons occupy the bottom of conduction band in MgxZn1-xS bulk crystal. Moreover, the dielectric constant decreases and the optical absorption peak obviously has a blue shift. The calculated results provide important theoretical guidance for the applications of MgxZn1-xS bulk crystal in optical detectors.
Keywords:  first-principles      MgxZn1-xS      electronic structure      optical properties  
Received:  10 March 2014      Revised:  21 April 2014      Accepted manuscript online: 
PACS:  71.20.-b (Electron density of states and band structure of crystalline solids)  
  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
Fund: Projected supported by the National Natural Science Foundation of China (Grant Nos. 61076042 and 61474048).
Corresponding Authors:  Xu Zhi-Mou     E-mail:  xuzhimou@hust.edu.cn
About author:  71.20.-b; 78.20.Ci

Cite this article: 

Yu Zhi-Qiang (余志强), Xu Zhi-Mou (徐智谋), Wu Xing-Hui (武兴会) Electronic structure and optical properties of MgxZn1-xS bulk crystal using first-principles calculations 2014 Chin. Phys. B 23 107102

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