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Effect of annealing temperature on the optical spectra of CdS thin films deposited at low solution concentrations by CBD technique.


Citation

Rizwan, Zahid and Zakaria, Azmi and Mohd Ghazali, Mohd Sabri and Jafari, Atefeh and Ud Din, Fasih and Zamiri, Reza (2011) Effect of annealing temperature on the optical spectra of CdS thin films deposited at low solution concentrations by CBD technique. International Journal of Molecular Sciences, 12 (2). pp. 1293-1305. ISSN 1422-0067; ESSN:1422-0067

Abstract

Two different concentrations of CdCl 2 and (NH 2) 2CS were used to prepare CdS thin films, to be deposited on glass substrate by chemical bath deposition (CBD) technique. CdCl 2 (0.000312 M and 0.000625 M) was employed as a source of Cd 2+ while (NH 2) 2CS (0.00125 M and 0.000625 M) for S 2- at a constant bath temperature of 70 °C. Adhesion of the deposited films was found to be very good for all the solution concentrations of both reagents. The films were air-annealed at a temperature between 200 °C to 360 °C for one hour. The minimum thickness was observed to be 33.6 nm for film annealed at 320 °C. XRD analyses reveal that the films were cubic along with peaks of hexagonal phase for all film samples. The crystallite size of the films decreased from 41.4 nm to 7.4 nm with the increase of annealing temperature for the CdCl 2 (0.000312 M). Optical energy band gap (E g), Urbach energy (E u) and absorption coefficient (α) have been calculated from the transmission spectral data. These parameters have been discussed as a function of annealing temperature and solution concentration. The best transmission (about 97%) was obtained for the air-annealed films at higher temperature at CdCl 2 (0.000312 M).


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Additional Metadata

Item Type: Article
Divisions: Faculty of Science
DOI Number: https://doi.org/10.3390/ijms12021293
Publisher: MDPI
Keywords: Air-annealing; Cadmium sulphide; Chemical bath deposition; Window layer.
Depositing User: Nur Farahin Ramli
Date Deposited: 19 Sep 2013 02:29
Last Modified: 30 Oct 2015 08:28
Altmetrics: http://www.altmetric.com/details.php?domain=psasir.upm.edu.my&doi=10.3390/ijms12021293
URI: http://psasir.upm.edu.my/id/eprint/24759
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