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Influence of substrate temperature on structural, optical and electrical properties of evaporated cadmium sulphide thin films

N. M. SHAH1, J. R. RAY1, M. S. DESAI1, C. J. PANCHAL1,*

Affiliation

  1. Applied Physics Department, Faculty of Technology and Engineering, The M. S. University of Baroda, Vadodara-390001, Gujarat, India

Abstract

The hexagonal cadmium sulphide (CdS) thin films with strong (002) orientation is prepared by thermal evaporation technique. The effect of substrate temperature on the structural, morphological, compositional, optical and electrical properties of CdS thin films is investigated. X-ray diffraction and transmission electron microscopy analysis of the films suggests that films presented hexagonal structure and no secondary or mixed phases are found. Scanning electron microscopy images revealed that the grain size increases with Ts while energy dispersive x-ray analysis confirms homogeneity and stoichiometry of films. The analysis of transmission spectra showed that CdS films deposited at different Ts had transmission and energy band gap in the range of 60-90% and 2.32-2.40 eV respectively. Electrical characterization of films deposited at different Ts carried out using Hall effect measurements suggests that films have resistivity and mobility value in the range of 104 Ω cm and 2-40 cm2 /Vs respectively influenced by substrate temperature..

Keywords

CdS thin film, Substrate temperature, X-ray diffraction, Scanning electron microscopy, Optical and electrical characterization.

Submitted at: March 17, 2010
Accepted at: Oct. 14, 2010

Citation

N. M. SHAH, J. R. RAY, M. S. DESAI, C. J. PANCHAL, Influence of substrate temperature on structural, optical and electrical properties of evaporated cadmium sulphide thin films, Journal of Optoelectronics and Advanced Materials Vol. 12, Iss. 10, pp. 2052-2056 (2010)