Influence of substrate activation process on structural and optical properties of ZnS thin films |
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Institution: | Department of Physics, Chonbuk National University, Jeonju 561-756, Republic of Korea |
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Abstract: | ZnS thin films were deposited on glass substrates by a chemical bath deposition method using a substrate activation process in which aluminum ions become “contaminants” that act as a nucleation center for active components within the deposition solution. The structure and morphology results demonstrate that the films have a ZnS sphalerite crystal structure with a particle size less than 15 nm, and the films consist of small homogeneous grains. The effects of the substrate activation process on the band gap energies and donor-acceptor pair luminescence process were also investigated. A green emission centered at 502 nm was produced due to donor-acceptor transitions from the aluminum acceptor to the ionized and substitution aluminum centers (Al3+). |
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Keywords: | Thin films Zinc sulfide Substrate activation process Photoluminescence Donor–acceptor pair |
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