Presentation Information
[9a-PA7-5]Preparation of FAPbI3 Perovskite Quantum Dot Inks via Ligand Exchange Treatment and Their Application in Solar Cells
〇Shunji Otomo1, Yang Yongee1, Shuzi Hayase1, Qing Shen1 (1.UEC)
Keywords:
semiconductor,perovskite,quantum dot solar cells
Metal halide perovskites have attracted considerable attention as next-generation photovoltaic materials because of their excellent light absorption properties, tunable band gaps, and compatibility with solution-based fabrication of lightweight and flexible devices. In this study, we focus on perovskite quantum dots (PQDs), which are nanocrystalline perovskites. PQDs are promising for solar cell applications because they are expected to achieve high theoretical power conversion efficiencies through multiple exciton generation and have been reported to exhibit improved phase stability. However, long-chain ligands such as oleic acid and oleylamine, which stabilize the PQD surface, hinder charge transport between quantum dots and reduce the photocurrent and power conversion efficiency. Therefore, ligand exchange to shorter ligands is essential. Conventional layer-by-layer methods, however, often require polar solvents, which can induce defects and increase fabrication time. To address these issues, we prepared highly concentrated PQD inks by performing ligand exchange in solution and fabricated PQD active layers using a one-step process without polar solvents. This approach aims to improve the electrical conductivity of PQD films and enhance solar cell performance.