Optical and structural properties of ZnSxSe1−x thin films deposited by thermal evaporationM. Ashraf, S. M.J. Akhtar, M. Mehmood and A. QayyumEur. Phys. J. Appl. Phys., 48 1 (2009) 10501DOI: https://doi.org/10.1051/epjap/2009114