A PHOTODETECTOR BASED ON ZNCDS NANOPARTICLES IN A CDS MATRIX FORMED BY SCREEN PRINTING AND SINTERING OF CDS AND ZNCL2

High photosensitive CdS:ZnCdS structure was formed by screen printing and high temperature sintering of CdS and ZnCl2 powders. The sintering of the film at high temperatures resulted in the formation of ZnCdS n anoparticles in a CdS matrix by an ion interchange reaction followed b y a solid state reaction. The photosensitivity of the structure depend s on parameters like initial film composition (ZnCl2 to CdS ratio), si ntering temperature and sintering time. The influence of these paramet ers on the dark and photocurrent characteristics of CdS:ZnCdS structur e is explained by taking into consideration the presence of deep accep tor centers related to Cd and Zn vacancies, shallow donor levels due t o S vacancies in the films and recrystallization of ZnCdS nano particl es.