Anion
exchange reaction is a particularly versatile tool for the
synthesis of a large class of nanomaterials. Here we report a low
temperature, fast, reversible anion exchange reaction in halide perovskite
thin film. Although processed in the solid-state phase, the exchanged
hybrid perovskite shows good quality in terms of morphology conservation,
phase transformation, and homogeneous composition. The easily exchanged
reaction during the crystallization process suggests the robust nature
of the Pb–CH3NH3 framework and high diffusion
ability of halide ions in the perovskite lattice. Furthermore, we
show its application in perovskite solar cells; we find that the anion
exchange reaction does not induce any remarkable defects resulting
from the lattice transformation and morphology reconstruction. In
some case, the beneficial exchange of halide species involving simultaneous
displacement reaction and crystallization can be used to improve the
perovskite solar cell performance. Our work provides new physical
insight into understanding the perovskite formation mechanism and
the ionic behavior in the perovskite.
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