Effect of selenium doping on structural and optical properties of SnS:Se thin films by electron beam evaporation methodJohnson Henry, Kannusamy Mohanraj, Selvaraj Kannan, Seshathri Barathan and Ganesan SivakumarEur. Phys. J. Appl. Phys., 61 1 (2013) 10301DOI: https://doi.org/10.1051/epjap/2012120359