Interface Engineering of Perovskite Solar Cell Using a Reduced-Graphene Scaffold

Interface engineering of solar cell device is a prominent strategy to improve the device performance. Herein, we synthesize reduced-graphene scaffold (rGS) by using a new and simple chemical approach. In this regard, we synthesize a hollow structure of graphene and then fabricate a three-dimensional scaffold of graphene with a superior surface area using electrophoretic process. We employ this scaffold as an interface layer between the electron transfer and absorber layers in perovskite solar cell. The characterization tests and photovoltaic results show that rGS improves the carrier transportation, yielding a 27% improvement in device performance as compared to conventional device. Finally, a power conversion efficiency of 17.2% is achieved for the device based on the graphene scaffold. Besides, rGS amends the stability and hysteresis effect of the perovskite solar cell