MEMS Seminar: Progress in Halide Perovskite Solar Cells: Insight on Active Layers and Interfaces Relating to Stability

Photovoltaic devices based on hybrid organic-inorganic perovskite absorbers have reached outstanding performance over the past few years, surpassing power conversion efficiency of over 22%. This talk we discuss recent progress and challenges in hybrid perovskite solar cells with an emphasis on the role of the interface in device performance including stability. An examination of different perovskite active layers and interfacial electronic structure of these remarkable materials will be presented. Our studies at NREL indicate interface formation of the active layer with different carrier transport materials has direct implications for performance and it evolution over time in the resulting devices. Interface studies using surface science tools that provide insight into the character of these interfaces and identification of charge transfer mechanisms across the interface with chemical specificity will be touched upon to provide insight into the requirements for realizing high performance devices. Findings from these are combined with time resolved spectroscopy, structural studies and device level studies to validate impacts on carrier dynamics and demonstrate their technological relevance of interfacial insights will also be discussed to provide context for more recent studies examining cell level stability of these devices. Lunch will be served from 11:30 am - 12:00 noon.