Regensburg 2010 – scientific programme
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HL: Fachverband Halbleiterphysik
HL 39: Photovoltaics II
HL 39.2: Talk
Wednesday, March 24, 2010, 09:45–10:00, H3
3D photonic crystal interlayers for mircomorph thin film silicon tandem cell — •Johannes Üpping1, Andreas Bielawny1, Martin Otto1, Ralf B. Wehrspohn1, Lorenz Steidl2, Rudolf Zentel2, Seung-Mo Lee3, Mato Knez3, Thomas Beckers4, and Reinhard Carius4 — 1Institute of Physics, mikroMD, University of Halle Wittenberg — 2Dept. of Chemistry, University of Mainz — 3Max Planck Institute of Microstructure Physics Halle — 4Institute of Energy Research, IEF-5 Photovoltaics, Forschungszentrum Jülich GmbH
A 3D photonic intermediate reflector for textured micromorph silicon tandem solar cells has been investigated. In thin-film silicon tandem solar cells consisting of amorphous and microcrystalline silicon with two junctions of a-Si/μc-Si, efficiency enhancements can be achieved by increasing the current density in the a-Si top cell. It is one goal to provide an optimized current matching at high current densities. For an ideal photon-management between top and bottom cell, a spectrally selective intermediate reflective layer (IRL) is necessary. We show results toward the first fully integrated 3D photonic thin-film IRL device incorporated in a state-of-the-art textured tandem solar cell. The design and the preparation of a 3D self organized inverted opal photonic crystal structure in a textured micromorph tandem solar cell is presented.