ECN publication
Efficient colored silicon solar modules using integrated resonant dielectric nanoscatterers
Neder, V.; Luxembourg, S.L.; Polman, A.
Published by: Publication date:
ECN Solar Energy 15-8-2017
ECN report number: Document type:
ECN-W--17-013 Article (scientific)
Number of pages:

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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