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Resonant Nanophotonic Spectrum Splitting for Ultrathin Multijunction Solar Cells
journal contribution
posted on 2015-12-17, 08:41 authored by Sander
A. Mann, Erik C. GarnettWe
present an approach to spectrum splitting for photovoltaics
that utilizes the resonant optical properties of nanostructures for
simultaneous voltage enhancement and spatial separation of different
colors of light. Using metal–insulator–metal resonators
commonly used in broadband metamaterial absorbers we show theoretically
that output voltages can be enhanced significantly compared to single-junction
devices. However, the approach is general and works for any type of
resonator with a large absorption cross section. Due to its resonant
nature, the spectrum splitting occurs within only a fraction of the
wavelength, as opposed to traditional spectrum splitting methods,
where many wavelengths are required. Combining nanophotonic spectrum
splitting with other nanophotonic approaches to voltage enhancements,
such as angle restriction and concentration, may lead to highly efficient
but deeply subwavelength photovoltaic devices.
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