Synergistic Bimolecular Passivation Enabling High-Performance Inverted Perovskite Solar Cells
Afia Owusuah Akyaw·Sungjun Hong·신성록·Min Thein Kyaw·Thi Thanh Huyen Tran·Shah Syed Fawad Ali·Muhammad Rehan·Junseop Byeon·Donghyeop Shin·Kihwan Kim·Inyoung Jeong·SeJin Ahn·Mathew Munji·John Okumu·Kyung-Koo Lee·Young S. Park·Hung Van Tran
Surface and interfacial defects represent the primary loss pathways limiting the power conversion efficiency (PCE) and the operational stability of inverted perovskite solar cells (PSCs). Here, we report a sequential bimolecular passivation strategy employing propane-1,3-diammonium diiodide (PDAI) followed by (<i>E</i>)-[(4-trifluoromethyl)styryl]phosphonic acid (4TF) to simultaneously mitigate grain boundary and surface-state traps. PDAI acts as a deep-level defect passivant by penetrating grai