Perovskite interface microstructures: on and beyond grain boundaries

Interfaces play a key role in determining the performance of perovskite semiconductors. This talk will present a discussion concerning both internal and external interfaces of perovskites. First, I will discuss the characterization and properties of the most critical internal interface - grain boundaries in perovskites. Following this, I will demonstrate “grain-boundary functionalization” as an effective protocol to mitigate the negative impacts and imparting new functions of perovskite grain boundaries. Then, I will present a novel structure of “interpenetrating interface”, which is formed by an interdiffusion reaction between chemically modified perovskite and charge-transporting layers. This structure delivers enhanced physical properties and chemical stability, highlighting the importance of external interface design in perovskite semiconductors. Finally, I will present a perspective on future studies of various perovskite interface, which is stimulated by our recent characterization advances on atomic-scale scanning tranmission electron microscopic (STEM).