Faculty Publications

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Author: search.filters.author.Alagarasan, D.Subject: search.filters.subject.Crystal structure

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    Controlled growth of 1D-ZnO nanotubes using one-step hot plate technique for CZTS heterojunction solar cells
    (Elsevier Ltd, 2020) Varadharajaperumal, S.; Alagarasan, D.; Ganesan, R.; Satyanarayan, M.N.; Hegde, G.
    Present work reports a simple, rapid, one-step hot plate technique for systematic growth transformation of highly oriented ZnO nanorods (ZNRs) into ZnO nanotubes (ZNTs). The controlled growth of ZnO nanostructures (nanorods and nanotubes) was achieved at low temperature (90 °C) in a short time (1hr) in a sealed weighing bottle (100 ml). It is observed that as the Zinc precursor concentration increases, a vertically grown ZnR morphology evolves into ZNT. The crystal structure of as-grown ZnO nanostructures, surface morphology, phase, and optical energy gap were respectively characterized by XRD, FESEM, Raman, XPS, CL and UV–Vis spectroscopy. Grown nanostructures are further explored for their application in CZTS based heterojunction photovoltaics. © 2019
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    Enriched optoelectronic properties of cobalt-doped ZnO thin films for photodetector applications
    (Springer, 2021) Vinoth, S.; Arulanantham, A.M.S.; Saravanakumar, S.; Rimal Isaac, R.S.; Soundaram, N.; Chidhambaram, N.; Alagarasan, D.; Varadharajaperumal, S.; Shkir, M.; AlFaify, S.
    Cobalt-doped ZnO (ZnO:Co) thin films were synthesized using the chemical bath deposition technique for their potential application in ultraviolet (UV) photosensing. All the prepared samples were characterized using XRD, FESEM, EDX, PL, XPS, and UV–Vis absorption techniques. The UV photosensing property of the thin films was examined under the illumination of UV light (365 nm). The structural and morphological investigations reveal that the ZnO:Co samples have a hexagonal wurtzite crystal structure with nanowire morphology. An increase in crystallite size and a decrease in the bandgap of the samples were observed owing to the replacement of the Co2+ ions in the regular sites of Zn2+. The PL spectra show some defect emission peaks in the visible region because of the occurrence of oxygen vacancies, which suggests a high photoabsorption property of the samples. The XPS study was performed to understand the existence of elements and their binding states in the fabricated thin films. The UV photosensing studies reveal that the highest responsivity of 0.918 AW?1 was achieved for the ZnO:Co (1%) sample. © 2021, The Author(s), under exclusive licence to Springer Science+Business Media, LLC, part of Springer Nature.