Light sources based on reliable and energy-efficient light-emitting diodes (LEDs) are instrumental in the development of solid-state lighting (SSL). Most research efforts in SSL have focused on improving both the intrinsic quantum efficiency (QE) and the stability of light emitters. For this reason, it is broadly accepted that with the advent of highly efficient (QE close to 1) and stable emitters, the fundamental research phase of SSL is coming to an end. In this study, we demonstrate a very large improvement in SSL emission (above 70-fold directional enhancement for p-polarized emission and 60-fold enhancement for unpolarized emission) using nanophotonic structures. This is attained by coupling emitters with very high QE to collective plasmonic resonances in periodic arrays of aluminum nanoantennas. Our results open a new path for fundamental and applied research in SSL in which plasmonic nanostructures are able to mold the spectral and angular distribution of the emission with unprecedented precision.
Hybrid organic-inorganic perovskite materials have risen up as leading components for light-harvesting applications. However, to date many questions are still open concerning the operation of perovskite solar cells (PSCs). A systematic analysis of the interplay among structural features, optoelectronic performance, and ionic movement behavior for FA0.83 MA0.17 Pb(I0.83 Br0.17 )3 PSCs is presented, which yield high power conversion efficiencies up to 20.8%.
The performance of perovskite solar
cells has been progressing
over the past few years and efficiency is likely to continue to increase.
However, a negative aspect for the integration of perovskite solar
cells in the built environment is that the color gamut available in
these materials is very limited and does not cover the green-to-blue
region of the visible spectrum, which has been a big selling point
for organic photovoltaics. Here, we integrate a porous photonic crystal
(PC) scaffold within the photoactive layer of an opaque perovskite
solar cell following a bottom-up approach employing inexpensive and
scalable liquid processing techniques. The photovoltaic devices presented
herein show high efficiency with tunable color across the visible
spectrum. This now imbues the perovskite solar cells with highly desirable
properties for cladding in the built environment and encourages design
of sustainable colorful buildings and iridescent electric vehicles
as future power generation sources.
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