68.9% Efficient GaAs‐Based Photonic Power Conversion Enabled by Photon Recycling and Optical Resonance
نویسندگان
چکیده
For solar cells operating under the broad-band spectrum, photovoltaic conversion efficiency is fundamentally limited by transmission and thermalization losses. monochromatic light, these losses can be minimized matching photon energy absorber material's bandgap energy. Furthermore, for high-crystal-quality direct semiconductors, radiative recombination dominates minority carrier recombination. Light-trapping schemes leverage reabsorption of thereby internally generated photons. Such recycling increases effective excess concentration, which, in turn, photovoltage consequently efficiency. Herein, a back surface reflector underneath GaAs/AlGaAs rear-heterojunction structure leverages to effectively reduce therefore boost photovoltage. At same time, resonance created optical cavity tailored enhance near-bandgap absorption and, thus, minimize loss. With thin film process combined dielectric–metal reflector, an unprecedented 68.9 ± 2.8% 858 nm light at irradiance 11.4 W cm−2 demonstrated.
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ژورنال
عنوان ژورنال: Physica Status Solidi (rrl)
سال: 2021
ISSN: ['1862-6254', '1862-6270']
DOI: https://doi.org/10.1002/pssr.202100113