Add time:07/31/2019         Source:sciencedirect.com

The structural, electronic, and optical properties of wurtzite–stannite Cu2MgSi(SxSe1−x)4 alloys have been calculated based on Heyd–Scuseria–Ernzerhof (HSE) screened hybrid functional. The calculated band gap bowing parameter is 0.164 eV which may be a good reference for future research. According to the calculations of the density of states, we find that the peaks in the conduction band have a tendency of shifting to the lower energy as S concentration decreases. Furthermore, the dielectric function, reflectivity, and absorption coefficient are presented and discussed in detail. The spectra of dielectric function shift to lower energy region with the decrease of the S concentration. The static dielectric constants increase with the decrease of S mole fraction. And the strength of absorption peaks almost decrease. The absorption edge and the peak in the reflectivity have a tendency of shifting to lower energy.

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