Optical Properties and Band Gap Analysis of MAPbI3 Perovskite Layer doped Phenethylammonium Iodide (PEAI) in Solar Cells Applications

MAPbI3 perovskite material is a leading candidate for third-generation solar cells because it has high absorbance and a suitable band gap. However, efficiency and stability remain major issues. In this study, phenethylammonium iodide (PEAI) doping will be performed on the optical properties and energy gap of MAPbI3 perovskite material. The Perovskit layers were fabricated by two-step spin coating method which is known to be effective in producing controlled and homogeneous thin layers. Characterization of the coating was carried out by UV-Vis spectroscopy to obtain absorbance spectrum data, and then analyzed using the Tauc Plot method to obtain the energy Gap value. The results show that the addition of PEAI can increase the intensity of absorption in the visible light region and cause a blue shift at the absorption edge. The energy Gap value increased after doping from 1.61 eV in the pure sample without doping to 1.68 eV for the highest doping concentration. This indicates that PEAI doping plays a role in modifying the energy band structure and improving the optical characteristics of Perovskit layers. This study shows that PEAI doping is a promising approach to improving the optical performance of perovskite layers in solar cell applications.