SEMINAR

Interfacial two- and three-dimensional heterostructures that incorporate ammonium ligand intercalation have enabled rapid progress toward the goal of uniting performance with stability in perovskite solar cells. However, as the field continues to seek ever-higher durability, additional tools that avoid progressive ligand intercalation are needed to minimize degradation at high temperatures. In this talk, I will discuss how the molecular structure, varying both the tail groups and alkyl chain lengths, influences the surface interactions and its energetics. I will focus on developing a series of anilinium derivatives that exhibit minimal reactivity with perovskites, leading to improved stability at the interface. Additionally, I will introduce our physical insights into these interactions through transient reflection spectroscopy and angle-resolved x-ray photoelectron spectroscopy. In the last part of my talk, I will describe the challenges within the broader context of various optoelectronic technologies.