Tuning the interface of perovskites for efficient solar cells

Understanding and controlling of interfaces in perovskite solar cells lie at the heart of their rapid efficiency progress. In this talk, I will focus on interface engineering in perovskite solar cells (e.g. energy alignment, doping and carrier dynamics), including the construction of heterostructures using multi-dimensional perovskites. I will discuss the synthesis of 2D perovskites atop of 3D bulk perovskite for surface passivation. The precise control over the dimensionality of these quantum-confined 2D thin layers enables us to achieve efficient carrier transport across the interface while maintaining desirable trap passivation. I will also discuss the effects of surface modifications on carrier recombination dynamics at interfaces between perovskite and carrier transport layers. The ability to tune interface conditions will be even more critical as we move towards multi-junction device architecture in pursuit of higher efficiency.