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Title:
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Efficient colored silicon solar modules using integrated resonant dielectric nanoscatterers
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Author(s):
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Neder, V.; Luxembourg, S.L.; Polman, A.
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Published by:
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Publication date:
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ECN
Solar Energy
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15-8-2017
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ECN report number:
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Document type:
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ECN-W--17-013
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Article (scientific)
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Number of pages:
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5
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Abstract:
We demonstrate photovoltaic modules with a bright green color based on silicon heterojunction solar cells integrated with arrays of light scattering dielectric nanoscatterers. Dense arrays of crystalline silicon nanocylinders, 100-120 nm wide, 240 nm tall, 325 nm pitch, are made onto module cover slides using substrate-conformal soft-imprint lithography. Strong electric and magnetic dipolar Mie resonances with a narrow linewidth (Q?30) cause strong (35-40%) specular light scattering on resonance (?540 nm). The green color is observed over a wide range of angles (8-75?). As the resonant nanoscatterers are transparent for the major fraction of the incident solar spectrum the relative loss in short-circuit current is only 10-11%. The soft-imprinted nanopatterns can be applied on full-size solar modules, and integrated with conventional module encapsulation. The dielectric Mie resonances can be controlled by geometry, opening up a new road for designing efficient colorful or white building-integrated photovoltaics.
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