Temperature Dependence of Photoresponse of CdS Films

Abstract

Investigations into conductivity, photoconductivity and photoresponse of the vacuum evaporated cadmium sulfide (CdS) films have been carried out. Evaporated tin-nickel alloy is used for making ohmic contacts. Changes in the electrical properties of the system due to heat treatment of the thin-film samples are ascribed to changes in the contact resistance and the accompanying change in the surface recombination velocity at the metal-photoconductor interface. The rise and decay times of photoresponse of CdS films have been determined and the viability of the films in fabrication of a photodevice ascertained.

Indexing term:

• CdS films Photoresponse
• Temperature dependence