Proceedings of The 11th International Conference on Research in Engineering, Science & Technology
Optimization of Perovskite Compositions Compatible with Electron Transport Layers for Achieving High-Efficiency Perovskite Solar Cells in Solution-Process Method
Ismail Cihan KAYA, Hasan AKYILDIZ1, and Savaş SÖNMEOĞLU
Perovskite solar cells (PSCs) have recently become a major research field for solar cell technologies. The power conversion efficiency (PCE) of the lab-scale perovskite solar cell has been substantially improved in the last few years, and some groups have already reported PCE values above 25%. The performance of the PSCs depends on various factors, including the structure, composition, and morphology of the perovskite film, the architecture of the device, and the optoelectronic properties of the charge transporting layers. Therefore, optimization of the fabrication of each layer is essential to obtain efficient cells. In this study, solution-based PSC production was optimized using two different perovskite compositions and two different electron transporting layers. Firstly, TiO2 based mesoscopic PSCs were fabricated with MAPbI3 and Cs(0.05)FA(0.85)MA(0.1) PbI(2.7)Br(0.3) perovskite films. The PCE of the best performing cell with FTO/c-TiO2/m-TiO2/Cs(0.05)FA(0.85)MA(0.1)PbI(2.7)Br(0.3)/Spiro-OMeTAD configuration was determined as 17.0% and Voc of 1.10 V, Jsc of 23.38 mA/cm2, FF of 0.66, while the PCE of the MAPbI3 based cell was only 6.6% with Voc of 0.93 V, Jsc of 18.40 mA/cm2, and FF of 0.38. The difference in the PCE values was attributed to the different morphology of the perovskite layers in each cell. Secondly, the c-TiO2/m-TiO2 electron transporting layer was replaced with SnO2 to fabricate planar PSCs. These cells displayed an efficiency of 15.06% with the corresponding photovoltaic parameters; Voc 1.091 V, Jsc 22.63 mA/cm2, and FF 0.54. This current study sheds light on how to achieve high efficiency for solution-based perovskite solar cells.
Keywords: MAPbI3; Mixed cation; SnO2 ETL; TiO2 ETL.