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dc.contributor.authorPearce, Phoebe M
dc.contributor.authorCamarillo Abad, Eduardo
dc.contributor.authorHirst, Louise
dc.description.abstractIntegration of a rear surface nanophotonic grating can increase photocurrent in ultra-thin solar cells. Transparent gratings formed of dielectric materials and high bandgap semiconductors can offer efficient diffraction with lower parasitic absorption than more widely studied metal/dielectric equivalents. In these systems, the maximum photocurrent which can be obtained for a grating made of a given combination of materials is shown to follow a simple empirical model based on the optical constants of these materials and independent of grating dimensions. The grating dimensions still require optimization in order to maximize the photocurrent for a given active layer thickness by balancing the effects of diffraction outside the front surface escape cone and the tuning of waveguide modes in long wavelength regions which are poorly absorbed in an ultra-thin film. The optimal grating pitch is shown to be of particular relevance for both effects, changing nonmonotonically as the absorber gets thicker in order to track favourable waveguide mode resonances at wavelengths near the absorber bandgap. These trends together with the empirical model for material selection drastically reduce the design space for highly efficient light trapping with transparent gratings.
dc.description.sponsorshipEngineering and Physical Sciences Research Council (EP/L015978/1) Cambridge Trust Consejo Nacional de Ciencia y Tecnología H2020 European Research Council (853365)
dc.publisherOptica Publishing Group
dc.rightsAttribution 4.0 International
dc.titleDesigning transparent nanophotonic gratings for ultra-thin solar cells.
dc.publisher.departmentDepartment of Materials Science And Metallurgy
prism.publicationNameOpt Express
dc.contributor.orcidCamarillo Abad, Eduardo [0000-0001-8617-0059]
dc.contributor.orcidHirst, Louise [0000-0003-0073-6344]
rioxxterms.typeJournal Article/Review
pubs.funder-project-idEngineering and Physical Sciences Research Council (EP/L015978/1)
pubs.funder-project-idEuropean Commission Horizon 2020 (H2020) ERC (853365)
pubs.funder-project-idEPSRC (2338178)
cam.orpheus.successThu Feb 24 18:06:31 GMT 2022 - Embargo updated
pubs.licence-display-nameApollo Repository Deposit Licence Agreement

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Attribution 4.0 International
Except where otherwise noted, this item's licence is described as Attribution 4.0 International