Influence of pH on electrochemically deposited CdSe thin films |
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| Affiliation: | 1. Energy Materials Research Center, Korea Research Institute of Chemical Technology (KRICT), 141 Gajeong-ro, Yuseong-gu, Daejeon 305–600, Republic of Korea;2. Department of Materials Science and Engineering, Korea Advanced Instituted of Science and Technology, Daejeon 305–701, Republic of Korea;3. Department of Chemistry, The Catholic University of Korea, Bucheon, Gyeonggi-do 420–743, Republic of Korea;4. Department of Chemistry, Kyungsung University, Busan 608–736, Republic of Korea;1. Department of Physics, Rajarshi Chhatrapati Shahu College, Kolhapur 416003 (MS), India;2. Thin Film Physics Laboratory, Department of Physics, Shivaji University, Kolhapur 416004 (MS), India |
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| Abstract: | Polycrystalline CdSe thin films have been electrodeposited at room temperature on stainless steel (ss) and fluorine doped tin oxide (FTO) coated glass substrate from aqueous electrolytes containing salts of cadmium acetate and selenium dioxide. The pH of the bath is varied from 1.75, at the interval of 0.25, to 3. The effect of pH on the photoelectrochemical (PEC), structural and optical properties of the deposited film is studied. The pH of the bath is optimized by the PEC technique and is observed to be 2.75. The analysis of the XRD patterns show that the deposited CdSe material is polycrystalline with a hexagonal crystal structure. SEM study shows that the total substrate surface is well covered by uniformly distributed spherical shaped grains. The optical absorption studies reveal that the pH of the electrolytic solution has a significant effect on the band gap of the CdSe thin film. The transition involved is direct with band gap energy Eg of 1.72 eV. |
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