English
Perovskite solar cells (PSCs) have low cost and high power conversion efficiency. However, their practical applications are hindered by the lack of long-term stability mainly due to interface defects and easily affected metal electrodes. In the past few years, two-dimensional (2D) materials such as graphene and its derivatives, transition metal dichalcogenides, MXenes, and black phosphorus have been considered promising solutions to address these issues due to their suspended, non bonded surfaces, layer dependent electronic band structures, tunable harmonic functional groups, and inherent compactness. This article summarizes the latest progress of two-dimensional materials in efficient and stable PSC, including their role as interface materials and electrodes. We discussed their beneficial effects on perovskite growth, energy level arrangement, defect passivation, and prevention of external stimuli. Special emphasis was placed on the unique performance of two-dimensional materials in forming van der Waals heterojunctions at the bottom interface. Finally, the viewpoint of further developing PSC using two-dimensional materials was proposed, such as designing high-quality van der Waals heterojunctions, enhancing the uniformity and coverage of two-dimensional nanosheets, and developing novel electrodes based on two-dimensional materials.
