Optimization of different temperature annealed nanostructured CdSe thin film for photodetector applications

Alagarasan, D and Varadharajaperumal, S and Arun Kumar, KD and Naik, R and Arunkumar, A and Ganesan, R and Hegde, G and El Sayed Massoud, E (2021) Optimization of different temperature annealed nanostructured CdSe thin film for photodetector applications. In: Optical Materials, 122 .

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Abstract

In this work, the photo sensing performance of the highly sensitive CdSe-based photodetector prepared using thermal evaporation method on a cleaned glass substrate were analyzed. At various temperatures, the effect of post-annealing on the crystalline, morphological, optical, and photo-electrical properties was examined. X-ray diffraction (XRD) and Raman experiments confirmed the polycrystalline nature of the CdSe films. From the field emission scanning electron microscopy (FESEM), it was observed that there were changes in surface morphology and grain size of the films. Energy dispersive X-ray spectroscopy (EDS) confirms the presence of constituent elements such as Cd and Se in the deposited films. The UV�Visible measurement was used to evaluate the change in several optical properties of the examined films, such as bandgap (Eg), absorption & extinction coefficient (α & k) and refractive index (n). Importantly, varying annealing temperatures resulted in lower and higher bandgap values. The photo-response and optical properties of the annealed CdSe film at 300 °C were good, making it suitable for the application of photodetectors. © 2021 Elsevier B.V.

Item Type:	Journal Article
Publication:	Optical Materials
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to Elsevier B.V.
Keywords:	Annealing; Cadmium compounds; Energy dispersive spectroscopy; Field emission microscopes; II-VI semiconductors; Morphology; Photodetectors; Photons; Refractive index; Scanning electron microscopy; Selenium compounds; Substrates; Surface morphology; Thermal evaporation; Thin films, CdSe films; CdSe thin films; Cleaned glass substrates; Nano-structured; Optical-; Optimisations; Photodetector; Postannealing; Sensing performance; Thermal evaporation method, Energy gap
Department/Centre:	Division of Interdisciplinary Sciences > Centre for Biosystems Science and Engineering Division of Interdisciplinary Sciences > Centre for Nano Science and Engineering Division of Physical & Mathematical Sciences > Physics
Date Deposited:	22 Nov 2021 11:29
Last Modified:	22 Nov 2021 11:29
URI:	http://eprints.iisc.ac.in/id/eprint/70531

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