Presentation Details
| Enhanced Performance and Air-Processability of FAPbI₃ Perovskite Solar Cells via MAPbBr₃-Assisted Phase Regulation and Alkylammonium Interface Passivation Taehwan Kim1, Jihyun Kim1, Geumha Lim2, William Jo1, 2. 1New and Renewable Energy Research Center, Ewha Womans University, Seoul, South Korea.2Department of Physics, Ewha Womans University, Seoul, South Korea |
Abstract
Formamidinium lead iodide (FAPbI₃) has become the reference absorber for high-efficiency perovskite solar cells (PSCs) owing to its near-ideal bandgap and favorable charge transport properties. However, its intrinsic phase instability under ambient conditions and severe interfacial recombination losses continue to impede scalable device fabrication. In this work, we report air-processed FAPbI₃-based PSCs achieving a power conversion efficiency (PCE) of 21.92%, enabled by a synergistic strategy combining MAPbBr₃-assisted compositional engineering with alkylammonium-based interfacial passivation. Partial incorporation of MAPbBr₃ into the FAPbI₃ lattice effectively suppresses the formation of the photoinactive δ-phase while moderately widening the bandgap, leading to improved open-circuit voltage (VOC). However, this compositional modification alone limits grain growth and reduces photocurrent density. To compensate for these drawbacks, octylammonium iodide (OAI) and phenethylammonium iodide (PEAI) were introduced at the perovskite/HTL interface to remove residual PbI₂, reduce surface roughness, and suppress non-radiative recombination. Devices with the structure ITO / SnO₂ / (FAPbI₃)₀.₉₅(MAPbBr₃)₀.₀₅ / OAI / Spiro-OMeTAD / Au exhibit concurrent improvements in VOC, fill factor, PCE, and external quantum efficiency, alongside enhanced ambient stability. This work demonstrates a practical pathway toward scalable, air-processable FAPbI₃ photovoltaics through simultaneous control of bulk phase stability and interfacial defect chemistry.
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