Abstract
Optical properties of ZnS thin films coated with organic dye extract on different Zn2+ concentrations from ZnSO4 are presented in this study. The effects of concentration and post-deposition annealing temperatures on the optical properties of the films were investigated. Aqueous dye extract-coated ZnS nanocrystals, were prepared by a simple and low-cost chemical bath deposition method. Results obtained revealed that optical properties of the films were modified by concentration and post-deposition annealing temperature. Increasing concentration reduced the transparency of the films. Annealing increased the transparency of the films except for films deposited with 0.1M concentration of ZnSO4. In general, the heat-treated layers were found to transmit better than the as-deposited layers. The analysis of energy band gap showed a reduction in band gap with increasing Zn2+ concentration of the as-deposited films. It also indicated that post-deposition annealing, increased energy band gap except for films deposited with 0.1M concentration of ZnSO4. The relationship between the energy band gap with both concentration and post-deposition annealing fit into the quadratic model with high R2 values. The range of values of 3.889–3.981eV recorded for the band gaps is within the range for application in diverse solar architecture and optoelectronic devices.
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The authors sincerely appreciate the anonymous reviewers for their thorough review. Though independently reviewed, both raised similar issues about the manuscript. This is indicative of depth and thoroughness in their reviews, which have now helped to improve the manuscript. The authors also appreciate the Academic Research and Entrepreneurship Development (A-RED) Initiative, Asaba, Delta State, Nigeria, for provision of current literature and helping to run the plagiarism test on the manuscript.
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UPO conceived the concept and developed the study framework and methodology. SCI, AEI, CCA and CA sourced for the data, interpreted results obtained and drafted the first manuscript. HIO supplied the literature for the study, undertook the English language editing and reformatting of figures. HIO and SCI handled the various revisions of the manuscript in line with comments from reviewers and the editor. All authors made comments on the revised manuscript. UPO and HIO handled the submission and correspondence activities.
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Onochie, U.P., Ikpeseni, S.C., Igweoko, A.E. et al. Optical Properties of Zinc Sulphide Thin Films Coated with Aqueous Organic Dye Extract for Solar and Optoelectronic Device Applications. J. Electron. Mater. 50, 2576–2583 (2021). https://doi.org/10.1007/s11664-021-08792-0
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DOI: https://doi.org/10.1007/s11664-021-08792-0