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Effect of annealing temperature on the optical properties of nanostructured CdS films prepared by chemical bath deposition technique

Z. RIZWAN1,* , B. Z. AZMI1,2, M. G. M. SABRI1

Affiliation

  1. Department of Physics, Faculty of Science, Universiti Putra Malaysia, 43400 Serdang, Selangor D.E., Malaysia
  2. Advanced Material and Nanotechnology Laboratory, Institute of Advanced Technology, Universiti Putra Malaysia, 43400 UPM Serdang, Selangor D. E., Malaysia

Abstract

Different concentrations of CdCl2 and (NH2)2CS were used to prepare CdS thin films, to be deposited, on glass substrate by chemical bath deposition (CBD) technique employing CdCl2 as source of Cd2+ while (NH2)2CS for S2- at constant bath temperature 71 oC. Adhesion of the deposited films was found appreciable for all the solution concentrations of both reagents. The films were air-annealed at 360 oC for 1 h. The minimum thickness was observed to be 34.8 nm for air-annealed film. XRD analyses reveal that the films were cubic along with few feeble peaks of hexagonal phase at lower solution concentration. The crystallite size of the air-annealed films was increased from 12 to 50 nm with the increase of solution concentration. Optical energy band gap (Eg), Urbach energy (Eu) and absorption coefficient (α) were chosen as parameters of characterization, calculated from the transmission spectral data and are discussed as function of solution concentration. The best transmission (63 - 98% in the spectral range 350 - 1100 nm) was obtained for the air-annealed films at 0.00125 M thiourea..

Keywords

Chemical bath deposition, CdS, Thin films, Annealing.

Citation

Z. RIZWAN, B. Z. AZMI, M. G. M. SABRI, Effect of annealing temperature on the optical properties of nanostructured CdS films prepared by chemical bath deposition technique, Optoelectronics and Advanced Materials - Rapid Communications, 5, 4, April 2011, pp.393-397 (2011).

Submitted at: March 18, 2011

Accepted at: April 11, 2011