2 research outputs found
Observation of Enhanced Generation of a Fifth Harmonic from Halide Perovskite Nonlocal Metasurfaces
Lead
halide perovskites are widely employed in photonic and light-emitting
devices because of their rich optoelectronic properties and simplicity
of fabrication based on low-cost flexible technologies. Perovskite
bulk crystals and films demonstrate outstanding nonlinear characteristics
with large optical nonlinearities exceeding the nonlinear susceptibilities
of conventional semiconductor materials by several orders of magnitude.
One of the promising approaches for further enhancement of the nonlinear
response of perovskites as dielectric photonic materials is to employ
optical resonances of structured surfaces, or metasurfaces. Nonlocal
metasurfaces supporting lattice modes over many unit cells provide
a new approach to both spatial and spectral control of light fields,
and they may deliver improved characteristics of nonlinear effects
for a wide range of applications associated with broadband excitation
of multiple high-quality resonances. Here we report on the first observation
of enhanced fifth harmonic generation in MAPbBr3 halide
perovskite nonlocal metasurfaces driven by high-quality resonances
at the generated harmonic wavelength in the visible frequency range.
The demonstrated enhancement is about 2 orders of magnitude compared
to an unpatterned MAPbBr3 film of the same thickness, and
is broadband by virtue of the excitation of multiple resonant modes
in the highly nonlocal regime. Our work suggests a novel approach
for achieving parametric processes in resonant dielectric structures
with high efficiency
Enhancing Photovoltaic Performance of Hybrid Perovskite Solar Cells Utilizing GaP Nanowires
GaP-based nanomaterials is a powerful tool for modern
optoelectronic
device fabrication owing to their excellent electrophysical properties,
low optical losses, light localization, and optimal thermal conductivity.
In our work, we incorporate GaP nanowires into perovskite solar cells
to improve charge extraction from a perovskite layer without changing
a total solar cell thickness. As a result, we improve the MAPbI3 perovskite solar cell efficiency up to 18.8% by VOC and JSC enhancement. The
provided multiphysical theoretical simulations of the solar cells
with the incorporated GaP nanowires describe the mechanism of charge
extraction and optical absorption improvement. The developed method
can be employed in various thin-film solar cells with different compositions
of active material, as well as in other optoelectronic devices