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- W2029176886 abstract "Arrays of III-V direct-bandgap semiconductor nanopillars represent promising photovoltaic candidates due to their inherent high optical absorption coefficients and minimized reflection arising from light trapping, efficient charge collection in the radial direction and the ability to synthesize them on low-cost platforms. However, the increased surface area results in surface states that hamper the power conversion efficiency. Here, we report the first demonstration of GaAs nanopillar-array photovoltaics employing epitaxial passivation with air mass 1.5 global power conversion efficiencies of 6.63%. High-bandgap epitaxial InGaP shells are grown in situ and cap the radial p-n junctions to alleviate surface-state effects. Under light, the photovoltaic devices exhibit open-circuit voltages of 0.44 V, short-circuit current densities of 24.3 mA cm(-2) and fill factors of 62% with high external quantum efficiencies >70% across the spectral regime of interest. A novel titanium/indium tin oxide annealed alloy is exploited as transparent ohmic anode." @default.
- W2029176886 created "2016-06-24" @default.
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- W2029176886 date "2013-02-19" @default.
- W2029176886 modified "2023-10-18" @default.
- W2029176886 title "GaAs nanopillar-array solar cells employing in situ surface passivation" @default.
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- W2029176886 doi "https://doi.org/10.1038/ncomms2509" @default.
- W2029176886 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/3586731" @default.
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