The fast progress
of lab-scale perovskite solar cells makes the
problem of upscaling of perovskite thin-film deposition more and more
acute; therefore, the development of new methods for perovskite deposition
is highly desired. In this work, we proposed a new solution-free preparation
approach for hybrid perovskite films based on the in situ generation
of methylammonium iodide from methylamine and iodine vapors in the
presence of an organic reducing agent conjugated with a redox process
of metallic lead conversion with iodine vapor. At first, we demonstrated
that either metallic lead or lead iodide powders can readily react
with the solution of methylamine and iodine in the presence of isopropyl
alcohol acting as a reducing agent, resulting in a phase-pure polycrystalline
CH3NH3PbI3 perovskite. A possible
mechanism of underlying chemical processes has been proposed. In order
to convert the predeposited thin films of metallic lead to CH3NH3PbI3 perovskite, a protocol of sequential
treatment by iodine and methylamine vapors was proposed. Finally,
we revealed the optimal conditions of processing, which were proven
to be facile and robust for the sake of the better control of perovskite
grain morphology.
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