Interfaces and Interfacial Carrier Dynamics in Perovskites

Metal halide perovskites are currently among the most promising materials to reshape our renewable energy future through photovoltaics. Nevertheless, they are also among the more complicated materials to understand and to engineer functional photovoltaics devices from. Their current performance efficiencies have not reached the highest predicted value of 30.06%. Many efforts have been dedicated to developing MHP materials, while fewer efforts were directed to understand and engineer the interfaces and interfacial properties in MHPs. Recently, the understanding and engineering of interfacial properties in MHPs have become a hot topic due to the vital role of interfaces, especially carrier dynamics, on device stability and efficiency. This perspective highlights the importance of focusing research on interfaces and interfacial carrier dynamics in metal halide perovskites. After introducing current challenges in MHPs interfaces and interfacial engineering, we provide a perspective on the contribution that different time-resolved laser spectroscopies add to the growing field of perovskite photovoltaics.