Inverted perovskite solar cells (PSCs ) have demonstrated power conversion efficiencies (PCEs ) exceeding 26%. However, uncontrolled crystallization processes can negatively affect film quality, limiting the overall performance of PSCs.
To address these issues, we propose 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 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, facilitating the subsequent crystallization process.
As a result, highly crystalline α-FAPbI3 films were obtained with reduced trap density, increased carrier lifetime, PCE up to 25.29%, and improved stability of the inverted device. The results provide valuable insights for the innovative use of heterogeneous seeds to deposit high-quality α-FAPbI3 films.
eterogeneous Seed-Assisted FAPbI3 Crystallization for Efficient Inverted Perovskite Solar Cells
N. Yan, Y. Cao, Z. Dai, L. Jiang, Y. Yang, T. Li, L. Li, SF Liu, Z. Fang and J. Feng, Energy Environ. Sci., 2024.
DOI: 10.1039/D4EE01044B
https://pubs.rsc.org/en/content/articlelanding/2024/ee/d4ee01044b