Study Solid Solutions in CdS/CdTe Thin Films Heterosystems Obtaine by DC Magnetron Sputtering

Abstract

The influence of physical and technological condensation mode by direct current magnetron sputtering on the crystal structure and optical properties of grown CdS and CdTe films, CdS/CdTe thin films heterosystems was investigated. Traditional chloride treatment of thin-film CdS/CdTe heterosystem leads to recrystallization of CdTe basic layer and its wurtzite-sphalerite phase transition. After Cl treatment a bandgap in CdTe increases up to 1.5 eV, For CdS/CdTe heterosystem a decrease of a bandgap to 1.45 eV is observed which is determined by formation of solid solutions of $\mathrm{CdS}_{\mathrm{x}}\mathrm{Te}_{\mathrm{1-x}}$ at the interphase boundary of CdS/CdTe. The value of the stoichiometric parameter $\mathrm{x}=0,1\pm 0,01$ was calculated using the optical researches data.