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UNSW Sydney advances chloride-iodide perovskite solar cell research with organic halide passivators, addressing defects for improved stability. (Image Source: Science Direct)
Researchers from UNSW Sydney, Australia, have published a study titled 'Defects Passivation in Chloride-Iodide Perovskite Solar Cell with Chlorobenzylammonium Halides'. The research addresses ion migration issues in chloride-iodide-based perovskite solar cells caused by the radius mismatch between chlorine and iodine, which can lead to defects such as atomic vacancies or atom accumulation. These defects are common in solution-processed perovskite thin films. The study explores passivation using two organic halide passivators: 4-chlorobenzylammonium chloride and 4-chlorobenzylammonium bromide. The bulky organic benzylammonium cations passivate the surface, while chlorine or bromine diffusion passivates the bulk of the thin film. By varying the chlorine concentration (50%-100%) and bromine concentration (25%-50%), the study identifies optimal performance at a 75% chlorine and 25% bromine ratio, resulting in a 15% improvement in device efficiency and enhanced stability compared to the control device.