Abstract
HighlightsA series of 10 imidazolium-based ionic liquids (IILs) with different cations and anions have applied to unravel the passivation mechanism of the IILs on CsPbI2Br inorganic perovskites.It is found that anions of IILs play a more important role in passivation of lead- and cesium-related defects in inorganic perovskite compared with imidazole cations because they can form strong ionic interactions (Pb-F, Cs-F).A high-power conversion efficiency of 17.02% is obtained, which is among the highest values of CsPbI2Br-based perovskite solar cells.
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