1 research outputs found
Surface-Guided CsPbBr<sub>3</sub> Perovskite Nanowires on Flat and Faceted Sapphire with Size-Dependent Photoluminescence and Fast Photoconductive Response
All-inorganic lead
halide perovskite nanowires have been the focus
of increasing interest since they exhibit improved stability compared
to their hybrid organic–inorganic counterparts, while retaining
their interesting optical and optoelectronic properties. Arrays of
surface-guided nanowires with controlled orientations and morphology
are promising as building blocks for various applications and for
systematic research. We report the horizontal and aligned growth of
CsPbBr<sub>3</sub> nanowires with a uniform crystallographic orientation
on flat and faceted sapphire surfaces to form arrays with 6-fold and
2-fold symmetries, respectively, along specific directions of the
sapphire substrate. We observed waveguiding behavior and diameter-dependent
photoluminescence emission well beyond the quantum confinement regime.
The arrays were easily integrated into multiple devices, displaying
p-type behavior and photoconductivity. Photodetectors based on those
nanowires exhibit the fastest rise and decay times for any CsPbBr<sub>3</sub>-based photodetectors reported so far. One-dimensional arrays
of halide perovskite nanowires are a promising platform for investigating
the intriguing properties and potential applications of these unique
materials