A systematic study on chemically deposited cadmium sulfide (CdS) thin film

Journal of Theoretical and Applied Physics - Tập 14 - Trang 265-274 - 2020
Saiful Islam1,2, Tasnia Hossain3, Hasan Sarwar4, Mohammad Junaebur Rashid2
1Department of Information and Communication Technology, Bangladesh University of Professionals, Dhaka, Bangladesh
2Department of Electrical and Electronic Engineering, University of Dhaka, Dhaka, Bangladesh
3Department of Electrical and Electronic Engineering, University of Asia Pacific, Dhaka, Bangladesh
4Department of Computer Science and Engineering, United International University, Dhaka, Bangladesh

Tóm tắt

In this work, the conventional chemical bath deposition (CBD) technique and its growth parameters were systematically studied to deposit CdS thin films on the glass substrate. The samples were prepared using a simple aqueous solution containing cadmium sulfate (CdSO4·8H2O), thiourea [SC(NH2)2], ammonium sulfate [(NH4)2SO4] as a source of cadmium, sulfur, and a complexing agent, respectively. The deposited films were characterized to study the surface morphology, crystallographic structure, chemical composition, optical and electrical properties. Through this study, the structure was determined to cubic with (111) preferential orientation and the crystallinity of the films was improved with the increase of film thickness. The transmission spectra were recorded in the range of wavelength 300–600 nm. The optical bandgap of the optimized CdS films was varied from 2.43 to 2.74 eV. All the films exhibit n-type of conductivity which was found in the order of 10–4 to 10–5 (1/Ω-cm), suggesting that it would be suitable for the buffer layer in thin-film solar cells.

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Journal of Theoretical and Applied Physics

Tập 14

265-274

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