Surface Passivation and Energetic Modification Suppress Nonradiative Recombination in Perovskite Solar Cells.

ABSTRACT: Surface passivation via post-treatment is an important strategy for improving power conversion efficiency and operational stability of perovskite solar cells. However, so far the interaction mechanisms between passivating additive and perovskite are not well understood. Here, we report the atomic-scale interaction of surface passivating additive 2,2-difluoroethylammonium bromine (2FEABr) on the MAPbI₃. It is found that the bulky 2FEA⁺ cations tend to distribute at film surface, while the Br^- anions diffuse from surface into bulk. A combination of ¹⁹F, ²⁰⁷Pb, and ²H solid-state NMR further reveal the Br^- anions' partial substitution for the I^- sites, the restricted motion of partial MA⁺ cation

SUBMITTER: Dong W 

PROVIDER: S-EPMC9018932 | biostudies-literature | 2022 Apr

REPOSITORIES: biostudies-literature