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dc.contributor.authorAho, Timo
dc.contributor.authorGuina, Mircea
dc.contributor.authorElsehrawy, Farid
dc.contributor.authorCappelluti, Federica
dc.contributor.authorRaappana, Marianna
dc.contributor.authorTukiainen, Antti
dc.contributor.authorAlam, A B M Khairul
dc.contributor.authorVartiainen, Ismo
dc.contributor.authorKuittinen, Markku
dc.contributor.authorNiemi, Tapio
dc.date.accessioned2018-04-16T08:48:58Z
dc.date.available2018-04-16T08:48:58Z
dc.date.issued2018
dc.identifier.urihttps://erepo.uef.fi/handle/123456789/6327
dc.description.abstractWe report on the fabrication of diffraction gratings for application as back contact reflectors. The gratings are designed for thin-film solar cells incorporating absorbers with bandgap slightly lower than GaAs, i.e. InAs quantum dot or GaInNAs solar cells. Light trapping in the solar cells enables the increase of the absorption leading to higher short circuit current densities and higher efficiencies. We study metal/polymer back reflectors with half-sphere, blazed, and pyramid gratings, which were fabricated either by photolithography or by nanoimprint lithography. The gratings are compared in terms of the total and the specular reflectance, which determine their diffraction capabilities, i.e. the feature responsible for increasing the absorption. The pyramid grating showed the highest diffuse reflection of light compared to the half-sphere structure and the blazed grating. The diffraction efficiency measurements were in agreement with the numerical simulations. The validated model enables designing such metal/polymer back reflectors for other type of solar cells by refining the optimal dimensions of the gratings for different wavelength ranges.
dc.language.isoEN
dc.publisherThe Optical Society
dc.relation.ispartofseriesOPTICS EXPRESS: THE INTERNATIONAL ELECTRONIC JOURNAL OF OPTICS
dc.relation.urihttp://dx.doi.org/10.1364/OE.26.00A331
dc.rights© 2017 Optical Society of America. Users may use, reuse, and build upon the article, or use the article for text or data mining, so long as such uses are for non-commercial purposes and appropriate attribution is maintained. All other rights are reserved
dc.titleComparison of metal/polymer back reflectors with half-sphere, blazed, and pyramid gratings for light trapping in III-V solar cells
dc.description.versionpublished version
dc.contributor.departmentDepartment of Physics and Mathematics, activities
uef.solecris.id53789064en
dc.type.publicationTieteelliset aikakauslehtiartikkelit
dc.rights.accessrights© Optical Society of America
dc.relation.doi10.1364/OE.26.00A331
dc.description.reviewstatuspeerReviewed
dc.format.pagerangeA331-A340
dc.publisher.countryYhdysvallat (USA)
dc.relation.issn1094-4087
dc.relation.issue6
dc.relation.volume26
dc.type.okmA1
uef.solecris.openaccessOpen access -julkaisukanavassa ilmestynyt julkaisu


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