Simplified chemical processed Cd1-xAlxS thin films for high-performance photodetector applications

Kumar, KDA and Mele, P and Anitha, M and Varadharajaperumal, S and Alagarasan, D and Alhokbany, NS and Ahamad, T and Alshehri, SM (2021) Simplified chemical processed Cd1-xAlxS thin films for high-performance photodetector applications. In: Journal of Physics Condensed Matter: an Institute of Physics Journal, 33 (19).

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Abstract

In this present investigation, we report the effect of aluminum (Al) doping on the photoelectric performance of cadmium sulfide (CdS) thin films prepared by cost-effective automatic nebulizer spray method. The doping of Al concentrations varied from 1 at. to 9 at. in the steps of 3 at.. X-ray diffraction (XRD) patterns show hexagonal crystal structure with polycrystalline nature and the enrichment of crystallite sizes as a function of Al doping concentrations. The formed impurity phase i.e. CdO might be helpful in enhancing the photoelectric performance by its additional photo-generated charge carriers. The optical studies confirm the maximum absorption showed in the visible spectral range with the corresponding minimum bandgap of 2.28 eV for 6 at. of Al. The room temperature photoluminescence studies show an increase of near-band-edge (NBE) emission as a function of Al doping concentration and this NBE is close to the obtained bandgap in terms of wavelength. In addition, the observed red emission at 635 nm is due to the surface-related impurities or native defect states. From the present work, the observed responsivity (R), external quantum efficiency (EQE) and detectivity (D�) of the CdS:Al detectors are 8.64 AW-1, �2018 and 9.29 1011 jones, respectively for the optimum 6 at. of CdS:Al film. The performance of CdS:Al films reported in this work are significantly improved when compared with literature reports. The present investigation, therefore offers a potential material, CdS:Al, as a photodetector for various scientific and industrial applications. © 2021 IOP Publishing Ltd.

Item Type:	Journal Article
Publication:	Journal of Physics Condensed Matter: an Institute of Physics Journal
Publisher:	IOP Publishing Ltd
Additional Information:	The copyright for this article belongs to NLM (Medicine)
Keywords:	Aluminum; Cadmium sulfide; Carrier mobility; Cost effectiveness; Crystal impurities; Crystal structure; Crystallite size; Energy gap; II-VI semiconductors; Image enhancement; Metallic films; Photodetectors; Photoelectricity; Photons; Semiconductor doping; Sulfur compounds; Thin films, External quantum efficiency; Hexagonal crystal structure; Near band edge emissions; Photoelectric performance; Potential materials; Related impurities; Room-temperature photoluminescence; Visible spectral range, Aluminum metallography
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering
Date Deposited:	03 Aug 2021 05:45
Last Modified:	03 Aug 2021 05:45
URI:	http://eprints.iisc.ac.in/id/eprint/68924

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