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Phase Distribution and Carrier Dynamics in Multiple-Ring Aromatic Spacers-Based Two-Dimensional Ruddlesden-Popper Perovskite Solar Cells
摘要： Two-dimensional (2D) perovskites with natural multi-quantum-well structure have been reported to offer better stability compared to 3D perovskites. However, the understanding of the exciton separation and transport mechanism in 2D perovskite as well as developing more efficient organic spacers remain considerable challenges as the 2D perovskite exhibit large exciton binding energy due to quantum confinement. Here, a class of multiple-ring aromatic ammoniums, 1-naphthalenemethylammonium (NpMA) and 9-anthracenemethylammonium (AnMA), were developed as spacers for 2D Ruddlesden-Popper (RP) perovskite solar cells (PSCs). In addition to significantly enhanced stability, the device based on (NpMA)2(MA)n-1PbnI3n+1 (average n = 4) exhibits a champion efficiency of 17.25% and a high open circuit voltage of 1.24 V. The outstanding photovoltaic performance could be ascribed to the ultrafast exciton migration (within 7 ps) from 2D phases to 3D-like phases, which were confirmed by charge carrier dynamics results, leading to efficient exciton separation, charge transportation and collection. This work facilitates understanding the working mechanism of 2D PSCs deeply and offers an efficient way to further boosting their efficiency and stability by developing multiple-ring aromatic spacers.
关键词： perovskite solar cell,organic spacer,phase distribution,charge transport,two-dimensional
更新于2025-09-23 15:21:01
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Toward Phase Stability: Dion–Jacobson Layered Perovskite for Solar Cells
摘要： Three-dimensional halide based perovskites has emerged as promising semiconducting light harvester for thin-film solar cells fabrication, however, its intrinsic instability under humidity restricts their potential commercialization. To address such challenges, the development of low-dimensional Dion-Jacobson (DJ) phase / layered perovskites have recently gained substantial attention due to their intriguing environmental stability and competitive power conversion efficiency. In this review, we have screened and focused our investigation on the DJ phase in layered perovskite for solar cell fabrication, especially elucidation on the active role played by organic spacer cation for active layer. We also discuss the possible strategies that can be employed to further push the performance of DJ perovskite solar cells.
关键词： organic spacer cation,layered perovskites,Dion-Jacobson phase,phase stability,solar cells
更新于2025-09-11 14:15:04