Inverse perovskite solar cells have a power conversion efficiency of over 26%. However, an uncontrolled crystallization process can negatively affect the film quality, thus limiting the overall performance of perovskite solar cells . Liu Shengzhong, Feng Jiangshan from Shaanxi Normal University, Fang Zhimin from Yangzhou University, et al. proposed a novel heterogeneous seed-assisted FAPbI3 crystallization strategy to regulate the crystallization process and enhance the formation of α-phase perovskite. In this strategy, the strong interaction between 2,4-diaminopyrimidine (DAP ) and perovskite species suppresses the formation of solvent-dominated intermediate phases and promotes the formation of DAP-FA+[PbI3]-(δ) heterogeneous seeds.
These seeds rapidly transform into the desired α phase during the initial formation stage, thus facilitating the subsequent crystallization process. As a result, highly crystallized α-FAPbI3 films are obtained with reduced trap density and increased carrier lifetime, resulting in efficiencies as high as 25.29%, while the stability of the inverse device is also improved. The results of this study provide valuable insights into the innovative use of heterogeneous seeds to deposit high-quality α-FAPbI3 films.
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