High-Performance Perovskite Solar Cells Fabricated By Solvent Volatilization Method

Perovskite solar cells have attracted significant research efforts due to their remarkable performance, but most of them are prepared by the anti-solvent method. It’s not suitable for repeatability and large-scale production. We develop a perovskite film fabrication technique based on MAFAPbI3Cl precursor films, through annealing arrived recrystallization, forming high-quality perovskite films. The photovoltaic properties of the perovskite films fabricated with different experimental parameters are studied. The films prepared by our method show high reproducibility, facile operation, and significant potential in large-scale production. We use excess amount formanidinium iodide (FAI) to adjust the amount of methylammonium chloride (MACl) to optimize MAFAPbI3Cl precursor film. The experimental parameters include FAI amount and MACl amount are utilized to form high-quality perovskite films. Film structural and optical properties are studied by X-ray diffraction (XRD), UV-vis absorption spectra, photoluminescence (PL), time-resolved photoluminescence (TRPL) techniques. The best solar cell PCE reaches 20.64 % with the average PCE of 20%. These perovskite solar cells also exhibit excellent high stability and repeatability. We believe this work develops a way for the commercialization of perovskite solar cells.