6 research outputs found
Efficiency Enhancement of Gallium Arsenide Photovoltaics Using Solution-Processed Zinc Oxide Nanoparticle Light Scattering Layers
We demonstrate a high-throughput, solution-based process for subwavelength surface texturing of a III-V compound solar cell. A zinc oxide (ZnO) nanoparticle ink is spray-coated directly on top of a gallium arsenide (GaAs) solar cell. The nanostructured ZnO films have demonstrated antireflection and light scattering properties over the visible/near-infrared (NIR) spectrum. The results show a broadband spectral enhancement of the solar cell external quantum efficiency (EQE), a 16% enhancement of short circuit current, and a 10% increase in photovoltaic efficiency
Engineering a Large Scale Indium Nanodot Array for Refractive Index Sensing
In
this work, we developed a simple method to fabricate 12 × 4 mm<sup>2</sup> large scale nanostructure arrays and investigated the feasibility
of indium nanodot (ND) array with different diameters and periods
for refractive index sensing. Absorption resonances at multiple wavelengths
from the visible to the near-infrared range were observed for various
incident angles in a variety of media. Engineering the ND array with
a centered square lattice, we successfully enhanced the sensitivity
by 60% and improved the figure of merit (FOM) by 190%. The evolution
of the resonance dips in the reflection spectra, of square lattice
and centered square lattice, from air to water, matches well with
the results of Lumerical FDTD simulation. The improvement of sensitivity
is due to the enhancement of local electromagnetic field (E-field)
near the NDs with centered square lattice, as revealed by E-field
simulation at resonance wavelengths. The E-field is enhanced due to
coupling between the two square ND arrays with 2x period
at phase matching. This work illustrates an effective way to engineer
and fabricate a refractive index sensor at a large scale. This is
the first experimental demonstration of poor-metal (indium) nanostructure
array for refractive index sensing. It also demonstrates a centered
square lattice for higher sensitivity and as a better basic platform
for more complex sensor designs