**5. Conclusion**

Perovskite-structured photovoltaic materials attract a lot of interest due to its facile fabrication process and rapid progress in device performance. A series of perovskite-structured photovoltaic materials with high power conversion efficiency, including (1) organolead halide perovskite-structured materials, (2) lead-free perovskite-structured materials, (3) lead-reduced perovskite-structured materials, and (4) two-dimensional perovskite-structured materials, are reported herein in detail. Many problems that occur with these materials must be overcome before commercialization. It has been proved that the element in perovskite-structured material plays an important role in enhancing stability under humidity or constant irradiation and achieving high power conversion efficiency. Numerous alternative materials for ETL and HTL have been discovered to facilitate carrier transport at perovskite-structured material interface/ ETL and perovskite-structured material/HTL interface. If there is a breakthrough development in fabrication methods, enhancement of stability, and optimized device structure can be realized, the commercialization of environmental-friendly high-efficiency PSC will be in the near future.
