COMPARISON OFCdSANDZnSTHIN FILMS PREPARED BY CHEMICAL BATH DEPOSITION

Qi Liu () and Guobing Mao
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Qi Liu: Mechanical Engineering Department, Anhui University of Technology and Science, Anhui Wuhu, 241000, China
Guobing Mao: Mechanical Engineering Department, Anhui University of Technology and Science, Anhui Wuhu, 241000, China

Surface Review and Letters (SRL), 2009, vol. 16, issue 03, 469-474

Abstract: In this paper, we reported a comparative study of process and structural characterization of cadmium sulfide(CdS)and zinc sulfide(ZnS)thin films by chemical bath deposition (CBD) technique. Their deposition process is similar which clearly shows three different growth phases, a none-film one, a quasi-linear one, and a saturation one. And the growth rate of CBD-CdSis higher than that of CBD-ZnS. Through calculating the activation energy of reaction, we can conclude that the rate determining step of CBD-CdSin the deposition process is a chemical one, in contrast with the CBD-ZnSin which the determining step can be a diffusion step. The XRD analysis of the as-deposited films shows that the CBD-CdSfilms present cubic and hexagonal mixed structure and CBD-ZnSfilms are in cubicZnSstructure. The deposition time significantly influenced the crystal structure ofCdSthin film. Transmission measurement shows that when the wavelength is below 500 nm, the optical transmission of CBD-ZnSfilm is higher than that of CBD-CdSfilm. Optical transmission of both CBD-ZnSand CBD-CdSfilms is about 90% when the wavelength is over 600 nm. The band gap (Eg) value of CBD-CdSis about 2.41 eV and that of CBD-ZnSis about 3.51 eV.

Keywords: CdSthin film; ZnSthin film; chemical bath deposition (CBD) (search for similar items in EconPapers)
Date: 2009
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DOI: 10.1142/S0218625X09012871

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