Porous (Zn,Cd)S structures were formed by screen printing of CdS, ZnS, ZnCl2 and CdCl2 powders in different configurations and sintering in air at high temperature. The XRD (X-ray diffraction) analysis of these layers sintered at different temperatures revealed that the CdO and ZnO formation in the (Zn,CdS) matrix is by the phase transformation of (Zn,Cd)S. The structure, composition and photosensitivity of this composite structure depends on the sintering temperature, sintering atmosphere and the flux to semiconductor (F/S) ratio. The results indicate that the screen printed (Zn,Cd)S structure may be used as a photoconductor in solid state devices and as a photoelectrode in photo-electro-chemical energy conversion systems.