Autonomous Materials Systems Seminar: Professor William Jo

Professor William Jo, Department of Physics, Ewha Womans University, Seoul, South Korea, will lecture on "Enhanced Performance and Stability in Perovskite Solar Cells with Engineered Interface."

Abstract: 

The efficiency and stability of perovskite solar cells are significantly influenced by interfacial processes, where ionic migration and electronic transport are intertwined. This study presents an interfacial engineering approach to optimize carrier dynamics and reduce degradation in perovskite devices. Surface treatments with ammonium-based compounds at the ITO/SnO₂ interface reduce interfacial traps, improve electron extraction, and suppress charge accumulation, leading to enhanced stability and reduced hysteresis. Additionally, bromide-rich perovskites are compositional-tuned with lead thiocyanate additives to achieve controlled crystallization, improving grain orientation and reducing halide phase segregation. We also explore ion–electron coupling mechanisms at the SnO₂/α-FAPbI₃ interface, identifying ionic adsorption and space-charge formation as key degradation factors. To counteract these, we introduce a self-assembled 2D perovskite interlayer that limits ionic conductivity and stabilizes charge distribution. The resulting devices show a certified power conversion efficiency of 24.38% and maintain 91.87% of their initial efficiency after 2,000 hours of operation. These findings underscore the importance of interfacial phase control in enhancing perovskite solar cell performance and durability [1].

[1] J. H. Kim, J. S. Park, G. Y. Kim, and W. Jo, “Autonomously control of ion migration at FAPbI3 heterointerfaces via interfacial-self-assembled 2D perovskite”, Advanced Energy Materials 2402117 (2024).