Performance Optimization Of Perovskite Solar Cells Based On ?-Fe₂O₃ Electron Transport Material

The organic-inorganic hybrid perovskite solar cell has attracted wide attention in recent years due to it,s high power conversion efficiency and low costs.At present,TiO₂usually used as the electronic transport material for the high efficiency organic-inorganic hybrid perovskite solar cell,while the long-term light stability of the cells is limited.The organic-inorganic perovskite solar cells fabricated with?-Fe₂O₃electronic transport material have an excellent photostability.However,the photoelectric conversion efficiency of such cells is still relatively low.In this paper,the electronic transport material?-Fe₂O₃ has been modified to further improve the photoelectric performance and stability of the organic-inorganic hybrid perovskite solar cells.In addition,the photoelectric properties of inorganic perovskite solar cells based on?-Fe₂O₃ electron transport material have been explored,and the performance of the inorganic perovskite solar cells have been modified.?-Fe₂O₃ has been modified by[6,6]-phenyl-C61-butyric acid methyl ester?PCBM?,and?-Fe₂O₃/PCBM composite electron transport material was prepared.The electronic extraction of materials and crystallinity of the organic-inorganic hybrid perovskite CH₃NH₃PbI₃ were effectively enhanced.Because the carrier recombination is reduced,the short-circuit current and the photoelectric conversion efficiency of cells has been significantly improved.The photoelectric conversion efficiency of perovskite solar cells based on?-Fe₂O₃/PCBM composite electronic transport material has been reached to14.2%,which is 20%higher than that of pure?-Fe₂O₃ solar cells?12.1%?.The perovskite solar cells modified by PCBM exhibited an improved stability compared to the?-Fe₂O₃-based devices,retaining over 95%of their initial values after 45 days storage in ambient environment.?-Fe₂O₃ was applied to the solar cells based on CsPbBr_3-xI_x inorganic absorbent materials.Due to the low concentration of DMSO precursor concentration and rapid crystallization property of CsPbBr₃,the poor quality of the CsPbBr₃ inorganic perovskite film has been fabricated.And the photoelectric property of the solar cells are also very poor.CsPbBr_3-xI_x?0?x?1.5?was prepared by Halogen replace optimization.With the introduction of I^-,the concentration of inorganic perovskite precursor has been improved,the crystallization rate of inorganic perovskite has been reduced.So that the quality of the inorganic perovskite film has been improved,and the forbidden band width of the inorganic perovskite also has been reduced.When x=1.5,the energy gap of the perovskite is reduced to 1.99eV.The?-Fe₂O₃-based inorganic perovskite solar cells with the CsPbBr_1.5I_1.5.5 produced a open circuit voltage of 1.09V?short circuit current density of 12.79 mA cm^-22 and the photoelectric conversion efficiency reached to 9.81%.