en Research Paper Research Paper <span style="font-size:11pt"><span style="line-height:115%"><span aptos="" style="font-family:"><span lang="EN-US" style="font-size:10.0pt"><span style="line-height:115%"><span new="" roman="" style="font-family:" times="">Organic and Perovskite solar cells <span style="letter-spacing:-.15pt">have </span>attracted a lot of attention recently since they can <span style="letter-spacing:.1pt">be </span>used with flexible substrates and <span style="letter-spacing:-.15pt">have lower </span>manufacturing costs. The configuration and materials employed in their construction, including the Electron Transport <span style="letter-spacing:-.15pt">Layer </span>(ETL), active layer, electrode contact, and hole transport <span style="letter-spacing:-.15pt">layer </span>greatly influence the stability and performance of these solar cells. This research focuses on the simulation of solar cells, specifically utilizing zinc oxide (ZnO) as the electron transport layer. A 0.1 molar ZnO thin film was prepared from Zinc acetate salt and was deposited on a glass substrate using the cost effective Successive Ionic Layer Adsorption and Reaction (SILAR) method. In-depth investigations were carried out on several factors, including structural, surface, optical and numerical analysis. The obtained parameters were utilized in the General-Purpose Photovoltaic Device Model (GPVDM) software to perform numerical simulations of the organic solar cell and Perovskite solar cell. Both Organic solar cells and Perovskite solar cells were designed numerically and through careful observations, electrical parameters like Open circuit Voltage (Voc), Short circuit current (Jsc), Fill Factor (FF), and Power Conversion Efficiency (PCE) were identified. The studies indicate the promising performance of simulated solar cells with SILAR-synthesized ZnO thin film as the ETL.</span></span></span></span></span></span><br> &nbsp; Thin films,solar cell,Perovskite,Zinc Oxide,SILAR 53 69 http://ijmse.iust.ac.ir/browse.php?a_code=A-10-5189-1&slc_lang=en&sid=1 Rakhesh Vamadevan rakheshv@am.amrita.edu 1800319475328460020115 1800319475328460020115 Yes Department of Physics, Amrita school of Physical Sciences, Amrita vishwa vidyapeetham, Amritapuri Campus Sreedev Padmanabha sreedevp@am.amrita.edu 1800319475328460020116 1800319475328460020116 No Department of Physics, Amrita School of Physical Sciences, AmritaVishwa Vidyapeetham, Amritapuri, Kollam, 690525, Kerala, India Ananthakrishnan Ajithkumar ananthakrishnan1144@gmail.com 1800319475328460020117 1800319475328460020117 No Department of Physics, Amrita School of Physical Sciences, AmritaVishwa Vidyapeetham, Amritapuri, Kollam, 690525, Kerala, India