Development of 1D/3D Perovskite Heterostructure for Highly Efficient, Stable Perovskite Solar Cells
발표자
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초록
내용
Formamidinium lead iodide (FAPbI3)-based perovskite solar cells (PSCs) have achieved record-breaking power conversion efficiencies (PCEs) in recent years. Nevertheless, they suffer from poor phase stability when exposed to high moisture and temperature. Herein, we propose the use of pyrrolidinium iodide (PyrI) as surface passivators to promote the crystallinity and stability of the FAPbI3 perovskite film. Interestingly, PyrI passivation has resulted in the formation of a one-dimensional (1D) PbPyI3 capping layer atop the three-dimensional (3D) FAPbI3 perovskite film, which leads to the reduction of surface defects. This effectively suppressed defect recombination at grain boundaries and improved the phase stability of the perovskite film. Through suppressing charge recombination, the PCE was improved from ~19.5% (3D perovskite) to ~21.7% (1D/3D perovskite). These results confirmed that PyrI passivation is an effective strategy to enhance the performance and stability of the PSCs.