Hybrid 2D [Pb(CH3NH2)I2]n coordination polymer precursor for scalable perovskite deposition
2020
A two-dimensional
hybrid coordination polymer [Pb(CH3NH2)I2]n featuring
a well-defined layered structure is reported for scalable perovskite
ink and deposition. This coordination polymer exhibits structural,
spectroscopic, and physicochemical properties distinct from common
PbI2 perovskite precursors. Notably, it serves as a methylamine
“gas carrier” capable of liberating methylamine (CH3NH2) into the precursor solution, thus improving
the solubility of perovskite in unconventional, greener processing
solvents, such as acetonitrile. The purity of [Pb(CH3NH2)I2]n single crystals
and the ability of the precursor to reduce sources of defects such
as polyiodide species in solution allow the formation of high-quality
perovskite films. This eventually results in efficient and stable
devices, fabricated via a single-step antisolvent-free deposition
method, transferable to large-area slot die coating. Gram scale synthesis
of this unique lead precursor is demonstrated, essential for the scale-up
of perovskite photovoltaic technology.
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