Effect of interface charges on the efficiency of perovskite based solar cells

In spite of the excellent reported efficiencies, perovskite based solar cells are still plagued by concerns related to stability and hysteresis. While the major physical phenomena related to carrier generation and transport are fairly well understood through theoretical models and simulations, the crucial role of interfaces is not well explored in the community. In this manuscript we show, through detailed numerical simulations, that interface charges significantly affect the electrostatics of the device under illumination thus leading to sub-optimal performance, especially the fill factor. Indeed, this work highlights the need for proper interface passivation and provides a predictive framework towards exploring the effect of interface charges on the eventual device stability and performance degradation.