Cesium-based all-inorganic perovskite solar cells (PSCs), especially for CsPbI2Br component-based devices, have attracted increasing attention due to its advantage of superior thermal and phase stability. Since the pioneering study reported in 2016, more than 30 papers have been published, reporting the rapid boost in the power conversion efficiency (PCE) of PSCs to 14.81%. The CsPbI2Br PSC is one of the most remarkable research hotspots in the field of perovskite photovoltaics. In this progress report, the recent advances in CsPbI2Br PSCs are systematically reviewed, which in turn introduces the basic property and stability of active layers, and the performance improvements in these devices. The challenges as well as the possible solutions toward better-performing CsPbI2Br PSCs are also discussed. The theoretical calculation results point out that there is much room for further device performance enhancement, particularly in open-circuit voltages. This progress report focuses on CsPbI2Br material properties and summarizes recent strategies to improve the corresponding device's PCE, in order to open new perspectives toward commercial utility of PSCs.
Bibliographical noteKAUST Repository Item: Exported on 2021-04-13
Acknowledgements: Q.Z. and X.Z. contributed equally to this work. This work was financially supported by the National Science Foundation of China (NSFC) under Grant Nos. 51433003 and 51702115, the National key research and development program of China (2016YFB0401701), the National Basic Research Program of China (973 Program) under Grant No. 2014CB643503, National Postdoctoral Program for Innovative Talents (BX201600060), China Postdoctoral Science Foundation Funded Project (2017M611319), JLU Science and Technology Innovative Research Team 2017TD-06, and the Opening funds of State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Science.