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Metal/Polymer Back Reflectors with Diffraction Gratings for Light Trapping in III-V Solar Cells

descriptionPublicationkeyboard_double_arrow_right Conference object , Article 01 Jun 2018 Finland, Italy Publisher:IEEEJournal:2018 IEEE 7th World Conference on Photovoltaic Energy Conversion (WCPEC) (A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC)Funded by:EC | TFQD, EC | AMETIST

Authors: Aho T.; Guina M.; Elsehrawy F.; Cappelluti F.; Raappana M.; Tukiainen A.; Alam A. B. M. K.; +3 Authors

doi: 10.1109/pvsc.2018.8547661

handle: 11583/2738195

Metal/Polymer Back Reflectors with Diffraction Gratings for Light Trapping in III-V Solar Cells

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Abstract

We report on the fabrication, characterization and simulation of diffraction gratings for back contact reflectors in III-V solar cells. The gratings are designed for thin-film solar cells incorporating absorbers with bandgap slightly lower than GaAs, such as InAs/GaAs quantum dot or GaInNAs solar cells. Metal/polymer back reflectors with a blazed grating or a pyramid grating were fabricated by nanoimprint lithography. The gratings are compared in terms of diffraction ability, which is the feature responsible for increasing the absorption. The pyramid grating showed higher diffraction of light compared to the blazed grating. The diffraction efficiency measurements were in agreement with the numerical simulations. The model validation enables tailoring the properties of the reflectors for other type of solar cells by adjusting the optimal dimensions of the gratings for different wavelengths.

Countries

Finland, Italy

Related Organizations

Tampere University
Finland
Polytechnic University of Turin
Italy
University of Eastern Finland
Finland
Tampere University of Technology
Finland

Keywords

216 Materials engineering, 221 Nanotechnology, back reflector; diffraction gratings; dilute nitride; III-V solar cells; quantum dot solar cell, 114 Physical sciences

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