Electro-plating and characterisation of cadmium sulphide thin films using ammonium thiosulphate as the sulphur source

ABDUL-MANAF, N.A., WEERASINGHE, A.R., ECHENDU, O. K. and DHARMADASA, I. M. (2015). Electro-plating and characterisation of cadmium sulphide thin films using ammonium thiosulphate as the sulphur source. Journal of Materials Science: Materials in Electronics, 26 (4), 2418-2429.

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Official URL: http://dx.doi.org/10.1007/s10854-015-2700-5
Link to published version:: 10.1007/s10854-015-2700-5

Abstract

Cadmium sulphide (CdS) thin films have been successfully prepared from an aqueous electrolyte bath containing CdCl2 and ammonium thiosulphate ((NH4)2S2O3) using electrodeposition technique. The structural, compositional, optical, morphological and electrical properties of these thin films have been characterized using X-ray diffraction (XRD), Raman spectroscopy, energy dispersive X-ray spectroscopy, UV–Vis spectrophotometry, scanning electron microscopy (SEM), atomic force microscopy (AFM), photoelectrochemical cell and D.C. current–voltage (I–V) measurements. The optimum deposition cathodic potential has been observed at 1,455 mV, in a 2-electrode system with respect to carbon anode. Structural analysis using XRD shows a mixture of hexagonal and cubic phases in the as-deposited CdS samples and a phase transformation to the hexagonal structure occurred after heat treatment at 400 °C for 20 min. Optical studies demonstrate an improvement in the band edge, producing 2.42 eV for the band gap of the films after heat treatment. The heat treated CdS thin films show better transmission for wavelengths longer than 500 nm. SEM and AFM show that the heat-treated samples are more uniform, smoother and have larger grain size. Electrical studies confirm that the CdS thin films have n-type electrical conductivity and heat treated CdS thin films have resistivities of the order of 105 Ω cm.

Item Type: Article
Additional Information: Published online: 30 January 2015
Research Institute, Centre or Group: Materials and Engineering Research Institute > Thin Films Research Centre > Electronic Materials and Sensors Research Group
Identification Number: 10.1007/s10854-015-2700-5
Depositing User: Jill Hazard
Date Deposited: 18 Feb 2015 17:07
Last Modified: 19 Oct 2016 23:47
URI: http://shura.shu.ac.uk/id/eprint/9451

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