Research Article Investigating the Influence of Bath Temperature on the Chemical Bath Deposition of Nanosynthesized Lead Selenide Thin Films for Photovoltaic Application Saka Abel , 1 Jule Leta Tesfaye, 1,2 Lamessa Gudata, 1 Fekede Lamessa, 1 Ramaswamy Shanmugam, 3 L. Priyanka Dwarampudi, 4 N. Nagaprasad , 5 and Ramaswamy Krishnaraj 2,6 1 Department of Physics, College of Natural and Computational Science, Dambi Dollo University, Ethiopia 2 Centre for Excellence-Indigenous Knowledge, Innovative Technology Transfer and Entrepreneurship, Dambi Dollo University, Ethiopia 3 TIFAC, CORE-HD, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, Tamil Nadu, India 4 Department of Pharmacognosy, JSS College of Pharmacy, JSS Academy of Higher Education & Research, Ooty, Nilgiris, Tamil Nadu, India 5 Department of Mechanical Engineering, ULTRA College of Engineering and Technology, Madurai, 625104 Tamilnadu, India 6 Department of Mechanical Engineering, College of Engineering and Technology, Dambi Dollo University, Ethiopia Correspondence should be addressed to Ramaswamy Krishnaraj; prof.dr.krishnaraj@dadu.edu.et Received 2 August 2021; Accepted 24 January 2022; Published 9 February 2022 Academic Editor: A. Madhan Kumar Copyright © 2022 Saka Abel et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. Thin films of CBD are formed on metal surfaces from an aqueous solution containing Pb(NO 3 ) 2 and Na 2 O 4 Se. The impact of the bath temperature upon lead selenide NPs is analyzed. The evaluation of X-ray diffraction demonstrates that the produced NPs were polycrystalline with (111) orientation. The morphological analysis of the surface shows that the grains are spherical gemstones. As the bath temperature was raised from 20 to 85 degrees Celsius, the energy bandgap decreased from 2.4 to 1.2 eV, indicating a reduction in the band gap. Micron-sized nanoparticles produced at 85 degrees Celsius exhibited the best crystallinity and were uniformly spread across the surface of the substrate with excellent particle sizes. If the solution bath temperature increases from 20 ° C to 85 ° C, the average strength of PL decreases. The maximum photoluminescence strength is predominantly because of self-trapped exciton recombination, formed from O 2 vacancy and particle size called defect centers, for the deposited thin films at 45 ° C and 85 ° C. The photoluminescence intensity rises sequentially with all temperatures. Therefore, the finest solution temperature is 85 degrees Celsius. 1. Introduction Currently, the world is in trouble of air pollution released from nonrenewable sources of energy such as coal, natural gas, fossil fuels, and fabrics [1]. A wide-ranging investigation has been dedicated to producing numerous kinds of semi- conductor thin films which are applicable in renewable sources of energy like solar cells [2]. This is because of their potential uses in the production of photovoltaic materials, optical-electronic devices, sensors, and infrared indicator instruments [3]. The lead selenide thin films appeal con- sideration of many scholars because they are low cost, exist in abundance, and retain semiconducting material goods [4, 5]. There have been numerous ways for the fabrica- tion of thin films of lead selenide that have been discovered, which comprise electrodeposition, CBD, electrochemical atomic layer, photochemical, molecular beam epitaxial, and pulsed laser deposition method [6], amongst other tech- niques. Thin films created by chemical methods are fre- quently considerably costly than thin films produced by Hindawi Journal of Nanomaterials Volume 2022, Article ID 3108506, 6 pages https://doi.org/10.1155/2022/3108506