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11 September 2013 Spectrally selective intermediate reflectors for tandem thin-film silicon solar cells
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Thin–film silicon tandem solar cells consist of an amorphous silicon top cell and a microcrystalline silicon bottom cell stacked in series. In order to match the photocurrents of the top cell and the bottom cell, a proper photon management is essential. In this regard, we present the conceptual design and optical simulations of an intermediate reflector consisting of a stack of microcrystalline silicon oxide layers of different, alternating refractive indices. In contrast to 1–layer intermediate reflectors, the spectral and directional selectivity of these intermediate reflectors result in a gain for the top cell current while simultaneously increasing the charge carrier generation in the bottom cell.
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A. Hoffmann, U. W. Paetzhold, T. Merdzhanova, A. Lambertz, O. Höhn, C. Ulbrich, K. Bittkau, and U. Rau "Spectrally selective intermediate reflectors for tandem thin-film silicon solar cells", Proc. SPIE 8823, Thin Film Solar Technology V, 882305 (11 September 2013);

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