Effect of Substrate Temperature on the Structure, Optical and Photoelectric Properties of CdS thin Films prepared by Spray Pyrolysis Technique Based on Photo Sensor

Abstract :

Cadmium Sulfide thin films were successfully deposited on glass substrates by spray pyrolysis method. The films were grown at different substrate temperatures in the range, (250-400) oC. The effects of substrate temperature on the structural, optical, and electrical properties were studied. The X-ray patterns and morphological studies of CdS thin films indicated that the films are crystalline in nature with a hexagonal crystal structure. The grain size calculated and found to be 13.96 to 47.02 nm. The optical spectra exhibited high transmittance and band gap varied from 2.435 eV to 2.465 eV. The present device (Al-CdS) show high sensitivity and fast responsivity in visible light of region of electromagnetic wave and providing a simple and economical way to fabricate high-performance visible detectors. The thermo-electric measurements have been measured with two probe method. It was found that CdS thin films were semiconducting in nature with n-type.

Author Name : Mohamed A. Salman, Sabah J. Fathi1 & Issa Z. Hassan

Keywords: Thin Films, CdS, Spray Pyrolysis, Photo Detector.