Journal Articles

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Author: search.filters.author.AlFaify, S.

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    A comprehensive study on effect of annealing on structural, morphological and optical properties of CdO and photodetection of heterojunction n-CdO/p-Si diode
    (Elsevier GmbH, 2021) Poul Raj, I.L.P.; Chidhambaram, N.; Saravanakumar, S.; Sasikumar, S.; Varadharajaperumal, S.; Alagarasan, D.; Alshahrani, T.; Shkir, M.; AlFaify, S.
    The present investigation reports the synthesis of CdO using the facile sol-gel technique. The CdO samples exhibit cubic structure and their crystalline quality increases with different sintering temperatures (550, 650, and 750 °C). The maximum entropy method (MEM) was applied to calculate the charge density distribution of the CdO samples and the two-dimensional charge density maps showed a slight enlargement in the cell volume of the CdO with sintering temperatures. The bandgap of the CdO samples varied from 2.89 to 2.66 eV with increasing sintering temperature. Heterojunction n-CdO/p-Si photodiodes were constructed (using CdO samples) on silicon wafers using the spin coating procedure. The ideality factor of the diodes is found to decrease from 5.2 to 4.2 with sintering temperatures of the CdO. The heterojunction diode constructed using the CdO sample sintered at 750 °C exhibited the highest responsivity and external quantum efficiency values of 0.34 A/W and 109 %, respectively. Improved crystallinity, responsivity, and quantum efficiency make the developed CdO device useful for optoelectronics. © 2021 Elsevier GmbH
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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.