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HL: Fachverband Halbleiterphysik

HL 39: Photovoltaics II

HL 39.2: Vortrag

Mittwoch, 24. März 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.