Influence of La3+ doping on nebulizer spray pyrolysed In2S3 thin film for enhanced photodetector performance

Alagarasan, D and Hegde, SS and Kumar, A and Shanmugavelu, B and Murahari, P and Ganesan, R and Shetty, HD and Naik, R and Ubaidullah, M and Gupta, M and Pandit, B and Senthilkumar, N and Sehgal, SS (2023) Influence of La3+ doping on nebulizer spray pyrolysed In2S3 thin film for enhanced photodetector performance. In: Journal of Photochemistry and Photobiology A: Chemistry, 444 .

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Abstract

In recent years, the photodetectors gained much attention due to their wide range of applications and fabrication of high-performance, cost-effective devices using environmentally friendly material is always challenging. In this work we report the fabrication of Lanthanum -doped indium sulfide thin films (In2S3:La) using a low-cost nebulizer spray pyrolysis method. La-doping concentration is varied from 0 to 5 wt% and the effect of doping on the properties of In2S3 thin films are investigated using X-ray diffraction (XRD), energy dispersive x-ray analysis (EDX), field emission scanning electron microscope (FESEM), UV–Vis spectroscopy, photoluminescence spectra. Incorporation of 3 wt% of La3+ in In2S3 lattice has substantially improved the crystallinity, surface morphology and optical properties of the thin films suitable for the device fabrication. Moderate doping of La3+ in the crystal lattice of β-In2S3 led to a red-shift in the absorption edge, which benefited utilization of wider light spectrum. Photodetectors are fabricated using In2S3:La (0–5 wt%) films and photodetector performance parameters are evaluated using I-V characteristics and current–time characterization. The In2S3 film with 3% La dopant concentration showed high photodetector performance with estimated detectivity (D*), photoresponsivity (R), and external quantum efficiency (EQE) of 1.11 × 1011 Jones, 5.05 × 10-1 AW−1, 118% respectively. For the same sample, the rise and fall time calculated from transient photo-response analysis is found to be 0.4 s and 0.3 s respectively. These optimally doped In2S3:La 3wt% thin film samples could be useful for the fabrication of photosensor based optoelectronic devices.

Item Type:	Journal Article
Publication:	Journal of Photochemistry and Photobiology A: Chemistry
Publisher:	Elsevier B.V.
Additional Information:	The copyright for this article belongs to the Elsevier B.V.
Keywords:	In2S3 thin film; La doped; Nebulizer spray pyrolysis method; UV photodetector application.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	17 Jul 2023 10:46
Last Modified:	17 Jul 2023 10:46
URI:	https://eprints.iisc.ac.in/id/eprint/82444

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