Unraveling Passivation Mechanism of Imidazolium-Based Ionic Liquids on Inorganic Perovskite to Achieve Near-Record-Efficiency CsPbI₂Br Solar Cells.

ABSTRACT: The application of ionic liquids in perovskite has attracted wide-spread attention for its astounding performance improvement of perovskite solar cells (PSCs). However, the detailed mechanisms behind the improvement remain mysterious. Herein, a series of imidazolium-based ionic liquids (IILs) with different cations and anions is systematically investigated to elucidate the passivation mechanism of IILs on inorganic perovskites. It is found that IILs display the following advantages: (1) They form ionic bonds with Cs⁺ and Pb²⁺ cations on the surface and at the grain boundaries of perovskite films, which could effectively heal/reduce the Cs⁺/I^- vacancies and Pb-related defects; (2) They serve as a bridge between the perovskite and the hole-transpor

SUBMITTER: Xu J 

PROVIDER: S-EPMC8639893 | biostudies-literature | 2021 Dec

REPOSITORIES: biostudies-literature