Journal
ACS PHOTONICS
Volume 5, Issue 11, Pages 4289-4295Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acsphotonics.8b01245
Keywords
III-V solar cells; GaAs solar cell; spectral upconversion; surface plasmon resonance; nanomembrane
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Funding
- National Science Foundation [ECCS-1202522, ECCS-1509897, CBET-1707169]
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Spectral upconversion has the potential to compensate for sub-bandgap transparency of single-junction solar cells. Here a composite module of GaAs solar cells is presented that can improve their one-Sun photovoltaic performance by capturing long-wavelength photons below the bandgap via plasmonically enhanced spectral upconversion. Ultrathin, microscale GaAs solar cells released from the growth wafer and etched with a bottom contact layer are printed on a polymeric waveguide containing NaYF4:Er3+, Yb3+ upconversion nanocrystals (UCNC), coated on a plasmonic reflector composed of hole-post hybrid silver nanostructure. The photovoltaic efficiency of GaAs microcells on a UCNC-incorporated plasmonic substrate is increased by similar to 6.4% (relative) and similar to 11.8% (relative), respectively, compared to those on a nanostructured silver reflector without UCNC and on a plain silver reflector with UCNC, owing to the combined effects of local electric-field amplification to enhance the absorption of UCNC, augmented upconverted emission via coupling into radiative modes, as well as waveguided photon concentration.
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