jz9b02543_si_001.pdf (2.68 MB)
VLS Homoepitaxy of Lead Iodide Nanowires for Hybrid Perovskite Conversion
journal contribution
posted on 2019-10-17, 14:45 authored by Hyewon Shim, Naechul ShinControlled
fabrication of lead halide-based perovskite (LHP) nanostructures
provides a new methodology for exploiting the excellent optoelectronic
properties of the material. Here, we report the vapor–liquid–solid
(VLS) growth of a highly uniform and dense array of [0001]-oriented
PbI2 nanowires using PbI2 thin film as the epitaxial
substrate layer. We show that reducing the lattice mismatch of the
van der Waals epitaxial PbI2 substrate layer is necessary
to accommodate the aligned nanowire growth. Our proposed layer growth
model suggests that the nanowire growth is stabilized by maintaining
the {0001} liquid–solid interface, which stems from the nucleation
on the PbI2 substrate layer. We also demonstrate that the
strain-induced nanowire deflection after conversion into CH3NH3PbI3 depends on the transfer sequence and
conversion time. These findings provide a general opportunity to design
and fabricate nanostructures, such as heterojunctions or superstructures
for future device applications, rationally based on lead halide or
LHP nanowires.
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Hybrid Perovskite Conversion Controlled fabricationlayer growth modelnanowire growthVLSPbI 2 substrate layervan der Waals epitaxial PbI 2 substrate layerCH 3 NH 3 PbI 3strain-induced nanowire deflectionepitaxial substrate layerconversionfuture device applicationsLHPLead Iodide NanowiresPbI 2 nanowiresnanostructure
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