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Nanoscale Investigation of Intermediate Reflectors in Tandem Solar Cells with Randomly Textured Surfaces
T. Beckers, K. Bittkau, R. Carius, C. Rockstuhl, F. Lederer
Light Trapping, Thin Film Solar Cell, Optical Properties
Thin Films Solar Cells
Subtopic: Amorphous and Microcrystalline Silicon Solar Cells
Event: 24th European Photovoltaic Solar Energy Conference, 21-25 September 2009, Hamburg, Germany
Session: 3BV.4.13
2793 - 2796
ISBN: 3-936338-25-6
Paper DOI: 10.4229/24thEUPVSEC2009-3BV.4.13
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Document(s): paper


Dielectric intermediate reflectors in thin-film silicon tandem solar cells with randomly textured interfaces are investigated by near-field scanning optical microscopy and rigorous diffraction theory. Emphasis is put on the question how good the amorphous silicon top cell is optically matched to the microcrystalline silicon bottom cell. We found in dependence on the thickness of the intermediate layer Fabry-PĂ©rot oscillations for the absorption in the top cell with a larger period compared to flat interfaces. Optimized thicknesses of intermediate reflectors can improve the absorption by more than a factor of three in the weak absorbing wavelength region in an amorphous top cell when compared to a solar cell without intermediate layer.