Metal-organic frameworks (MOFs) as proton conductive materials have attracted increasing attention due to their applications in proton-exchange membrane fuel cells. While the majority of the MOFs are based on transition...
Porous crystalline metal-organic frameworks (MOFs) bearing sulfonic groups (–SO3H) are receiving increasing attention as solid-state proton-conductors because the –SO3H group can not only enhance the proton concentration but also form...
Passivation
of perovskite films by ionic liquids (ILs) improves
the performance (efficiency and stability) of perovskite solar cells
(PSCs). However, the role of ILs in the passivation of perovskite
films is not fully understood. Here, we report the reactions of commonly
used ILs with the components of perovskites. The reaction of ILs with
perovskite precursors (PbI2 and methylammonium iodide or
formamidinium iodide) in a 1:1:1 molar ratio affords one-dimensional
(1D) salts composed of the IL cation interspersed along infinite 1D
polymeric [PbI3]−
n
chains. If the IL is applied in excess, the resulting crystal
is composed of six cations surrounding a discrete [Pb3I12]6– cluster. All the isolated salts were
unambiguously characterized by single-crystal X-ray diffraction analysis,
which also reveals extensive hydrogen-bonding interactions.
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