Mezan Adly Al Qadri, Eka Nurfani
In this research, we study the effect of the layer thickness of 2 % mol Zn doped-TiO2 layers on MAPbI3-based perovskite solar cells (PSCs) performance. MAPbI3-based PCSs have low efficiency. One of the limiters of the MAPbI3-based PSC's efficiency is the thickness of TiO2 and its electrical properties. This research aims to enhance MAPbI3-based PSC efficiency by optimizing the thickness of the Zn-doped TiO₂ layer used as the electron transport layer (ETL). The samples were prepared by depositing Zn-doped TiO₂ onto indium tin oxide (ITO) glass substrates using a spin coating technique, resulting in samples with 1 (S1), 3 (S2), 5 (S3), and 7 (S4) times of coating and with the structure ITO/TiO2:Zn/MAPbI3/graphite/ITO. I-V electrical testing revealed increased MAPbI3-based PSC efficiency from 11.33 % to 11.54 %, 12.46 %, and 12.97 % for 1, 3, 5, and 7 times of coating, respectively. X-ray diffraction measurements indicated a tetragonal crystal structure with an increase in crystallite size from 17.92 nm to 18.85, 19.73, 20.67 nm for 1, 3, 5, and 7 times of coating, respectively. Scanning electron microscope (SEM) on surface section confirmed that the particle size of each sample is 17.84, 25.23, 28.3, and 30.90 nm for 1, 3, 5, and 7 times of coating, respectively. Based on SEM on cross-sectional, the thickness of each sample is 346, 466, 569, and 695 nm, for 1, 3, 5, and 7 times of coating, respectively. UV–VIS spectroscopy analysis a decrease in the band gap from 3.3 eV to 3.25 eV, 3.2 eV, and 3.15 eV for 1, 3, 5, and 7 times of coating, respectively. These findings highlight the potential for improving MAPbI3-based PSC efficiency by optimizing Zn-doped TiO₂ layer thickness, with significant implications for MAPbI3-based PSC fabrication in open-air environments. © 2025 The Authors
Department of Materials Engineering, Faculty of Industrial Technology, Institut Teknologi Sumatera (ITERA), Lampung, 35365, Indonesia; Center for Green and Sustainable Materials, Institut Teknologi Sumatera (ITERA), South Lampung, 35365, Indonesia