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Spectrally selective intermediate reflectors for tandem thin-film silicon solar cells

: Hoffmann, A.; Paetzold, U.W.; Merdzhanova, T.; Lambertz, A.; Höhn, O.; Ulbrich, C.; Bittkau, K.; Rau, U.


Eldada, L.A.; Heben, M.J.:
Thin Film Solar Technology V : 25–26 August 2013, San Diego
Bellingham, WA: SPIE, 2013 (Proceedings of SPIE 8823)
ISBN: 978-0-8194-9673-7
Conference "Thin Film Solar Technology" <5, 2013, San Diego/Calif.>
Conference Paper
Fraunhofer ISE ()

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.