Researchers at the University of New South Wales (UNSW) Sydney have developed a new technique to mitigate defects in chloride-iodide-based perovskite solar cells, which are prone to ion migration and atomic vacancies due to the atomic size differences of chlorine and iodine. According to the researchers, these defects reduce cell stability and efficiency. To address this, the team applied two organic halide passivators—4-chlorobenzylammonium chloride and 4-chlorobenzylammonium bromide—to passivate both the surface and bulk layers of the film. The research states that while chlorine or bromine diffuses to stabilize the bulk, benzylammonium cations stabilize the surface. Testing various ratios, a 75% chlorine and 25% bromine mixture was found optimal, achieving approximately a 15% efficiency boost compared to untreated cells and greatly enhanced stability. This dual-layer passivation could advance chloride-iodide perovskite technology in solar applications.
New passivation method improves perovskite cell efficiency
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