Abstract
The morphology of the pre-deposited PbI2 layer plays a crucial role in determining the quality of perovskite films in sequentially deposited perovskite solar cells. The main reason is that the PbI2 film is too dense, which makes it difficult for organic salts to fully enter and react with them. This work presents a novel solvent extraction post-treatment method for the construction of bilayer PbI2 films. The PCE of the prepared champion device reaches 23.8 %, which is higher than 21.6 % of the control device. We observed that the perovskite solar cells treated with EA retained over 90 % of their initial efficiency after being stored for approximately 700 h in a nitrogen atmosphere, and over 80 % in air, demonstrating superior stability compared to the control group.
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