| Citation: | DI Jia-yu, CUI Yan, WU Rui-xiang, LU Bin. High-performance photodetectors based on zero-dimensional lead-free perovskite thin films[J]. Chinese Optics. doi: 10.37188/CO.2024-0214
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Organic-inorganic hybrid lead-free perovskites have garnered significant attention due to their non-biotoxicity and environmental sustainability. Among these materials, MA3Sb2I9, with its stable zero-dimensional (0D) structure and lead-free nature, shows great promise for stable and efficient photodetection applications. In this study, we employ a MACl post-treatment to enhance the quality of MA3Sb2I9 perovskite thin films fabricated through antisolvent processing. This treatment facilitated the formation of Cl-Sb bond interactions between MACl and the perovskite thin films, effectively passivating the I− vacancies and grain boundary defects on the MA3Sb2I9 thin-film surface. This process not only improve the surface morphology and crystallinity of the thin film but also reduced the defect states density of the surface, thereby enhancing carrier extraction and transport efficiency. Consequently, the sensitivity of self-powered photodetectors based on the optimized thin-film preparation increased from 3.89 × 107 Jones to 5.72 × 108 Jones, representing an improvement by one order of magnitude. Furthermore, the rise and fall times were shortened from 37/76 ms to 31/37 ms, respectively, indicating an enhancement in the response speed of the devices.
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