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Title

Cloaking of solar cell contacts at the onset of Rayleigh scattering

AuthorsPérez de San Román, Etor ; Vitrey, Alan ; Buencuerpo, Jerónimo ; Prieto-González, Iván ; Llorens Montolio, José Manuel ; García-Martín, Antonio ; Alén, Benito ; Chaudhuri, Anabil; Neumann, Alexander; Brueck, Steven R. J.; Ripalda, José María
Issue Date24-Jun-2016
PublisherNature Publishing Group
CitationScientific Reports 6: 28669 (2016)
AbstractElectrical contacts on the top surface of solar cells and light emitting diodes cause shadow losses. The phenomenon of extraordinary optical transmission through arrays of subwavelength holes suggests the possibility of engineering such contacts to reduce the shadow using plasmonics, but resonance effects occur only at specific wavelengths. Here we describe instead a broadband effect of enhanced light transmission through arrays of subwavelength metallic wires, due to the fact that, in the absence of resonances, metal wires asymptotically tend to invisibility in the small size limit regardless of the fraction of the device area taken up by the contacts. The effect occurs for wires more than an order of magnitude thicker than the transparency limit for metal thin films. Finite difference in time domain calculations predict that it is possible to have high cloaking efficiencies in a broadband wavelength range, and we experimentally demonstrate contact shadow losses less than half of the geometric shadow.
Publisher version (URL)https://doi.org/10.1038/srep28669
URIhttp://hdl.handle.net/10261/181520
DOI10.1038/srep28669
E-ISSN2045-2322
Appears in Collections:(IMN-CNM) Artículos
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