Tis work is licensed under the Creative Commons Attribution 4.0 International License. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Nanochem. Res., 8(4): 299-305, Autumn 2023 RESEARCH PAPER SnO 2 Layer Treatment with Tthioacetamide in Perovskite Solar Cell Fatemeh Ghasemi1,Razieh Keshtmand2, Nima Taghavinia 1,3 * 1 Department of Physics, Sharif University of Technology, Tehran, Iran 2 Department of Physics, Iran University of Science and Technology, Tehran, Iran 3 Institute for Nano Science and Nanotechnology, Sharif University of Technology, Tehran, Iran * Corresponding Author Email: taghavinia@sharif.edu taghavinia@sharif.edu How to cite this article Ghasemi F., Keshtmand R., Taghavinia N., SnO2 layer treatment with thioacetamide in perovskite solar cell. Nanochem. Res., 2023; 8(4): 299-305. DOI: 10.22036/NCR.2023.04.08 ABSTRACT The electron transport layer plays a pivotal role in shaping the photovoltaic atributes of perovskite solar cells. SnO 2 stands out as an exemplary electron transport layer for perovskite solar cells due to its exceptonal carrier mobility, deep conducton band, suitable band gap, and compatbility with low-temperature processing. Although surface modifcaton of SnO 2 has yielded noteworthy enhancements in device performance over recent years, there remains considerable untapped potental to further refne its efciency and long-term stability. In this study, thioacetamide was employed to modify the SnO 2 surface, aiming to elevate the quality of the electron transport layer and establish a robust interface with perovskite. The fndings underscored that the thioacetamide-modifed SnO 2 layer exhibited augmented perovskite absorpton in the visible spectrum compared to the control sample. Additonally, the atenuaton in photoluminescence intensity within the modifed sample alludes to improved electron extracton and enhanced charge transport from the perovskite layer to the electron transport layer. Assessment of solar cell performance unveiled superior and more consistent photovoltaic parameters in the modifed sample. Ultmately, the best efciency was achieved with the perovskite solar cell using SnO 2 modifed with thioacetamide, boastng an efciency of 15.15%. ARTICLE INFO Artcle History: Received 06 Jul 2023 Accepted 17 Sep 2023 Published 01 Oct 2023 Keywords: Perovskite solar cell, Electron transport layer, Surface modifcaton, SnO 2 , Thioacetamide. INTRODUCTION Perovskite solar cells (PSCs) have emerged as a promising photovoltaic (PV) technology, thanks to their enhanced efciencies and remarkably low production costs. Recent advancements in perovskite solar cell development underscore its strong potential for commercialization. Te performance of perovskite solar cells is profoundly infuenced by factors such as device architecture, perovskite active materials, charge transport layers, and interfaces—areas that have garnered extensive research attention. Typical perovskite solar cell confgurations follow an n-i-p structure, encompassing a transparent conductive oxide electrode, an electron transport layer (ETL), an absorber layer, a hole transport layer, and a metal- based cathode [1–3]. Among these layers, ETLs play a pivotal role in enhancing perovskite solar cell performance. Te electron transport layer within perovskite solar cell structures assumes a critical function in facilitating electron extraction and collection, signifcantly impacting overall device efciency. Tis layer promotes charge transfer and minimizes carrier recombination at the interface between ETL and perovskite. It can directly infuence key photovoltaic parameters like short-circuit current density, open-circuit voltage, and fll factor [4,5]. A variety of materials, such as TiO 2 , SnO 2 , ZnO,