講演情報
[10p-S201-4]Incorporation of Ligand-Capped FAPbI3 Nanoparticles into the Perovskite Layer for High-Performance and Stable Perovskite Solar Cells
〇(P)Weina Zhang1, Takeru Bessho1, Ludmila Cojocaru1, Satoshi Uchida1, Jotaro Nakazaki1, Hiroshi Segawa1 (1.The Univ. of Tokyo)
キーワード：
Perovskite solar cell、Nanoparticles
Perovskite solar cells (PSCs) are considered leading candidates for next-generation photovoltaic technologies due to their high power conversion efficiency (PCE) and low production cost. Among various compositions, single-cation FAPbI3 perovskites exhibit excellent performance due to their ideal bandgap (1.48 eV), high charge mobility, and enhanced phase stability. However, their commercialization is limited by phase instability and environmental degradation, which cause a transition from the photoactive α-phase to the non-perovskite δ-phase. Therefore, stabilizing the α-phase while improving film crystallinity and defect passivation is essential. Recently, ligand-capped perovskite nanoparticles (NPs) have emerged as effective additives to enhance film quality and stability, promoting grain growth, reducing defect states, and increasing moisture resistance. Nevertheless, the use of FAPbI3 NPs within FAPbI3 bulk films remains underexplored.In this study, we introduce OA/OAm ligand-capped FAPbI3 NPs into the FAI precursor solution to regulate crystallization and enhance optoelectronic properties. This approach leads to larger grain sizes, better crystallinity, and lower defect density. The ligands help passivate surface defects by interacting with under-coordinated Pb2+ and I-, redistributing residual PbI2, and increasing the film’s hydrophobicity. Consequently, the films exhibit improved carrier dynamics, reduced trap density, and enhanced environmental stability.Devices incorporating these NPs reach a peak PCE of 25.68%, with enhanced Voc, Jsc, and FF, and show negligible hysteresis. Stability tests under 50% relative humidity demonstrate that unencapsulated devices retain 93% of their initial efficiency after 1000 hours.