Berlin 2015 – scientific programme
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O: Fachverband Oberflächenphysik
O 52: Focus Session: Nanophotonic Concepts and Materials for Energy Harvesting - Plasmonics, Transformation Optics, Upconversion, and beyond
O 52.5: Talk
Wednesday, March 18, 2015, 12:30–12:45, EW 201
Tailoring Disorder of Nanophotonic Light-Trapping Concepts for Thin-Film Silicon Solar Cells — •Ulrich W. Paetzold1, Karsten Bittkau1, Y. J. Donie2, Guillaume Goumard2, Radwanul H. Siddique2, Michael Smeets1, Hendrik Hölscher2, Reinhard Carius1, Uwe Rau1, and Uli Lemmer2 — 1IEK5 * Photovoltaik, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany — 2Light Technology Institute and Institute for Microstructure Technology, Karlsruhe Institute of Technology, Engesserstr. 13, 76131 Karlsruhe, Germany
Light-trapping is essential for high performance thin-film solar cells applying optically thin photoactive absorber layer such as a-Si:H with thicknesses below 500 nm. Conventional devices apply randomly textured transparent conductive oxide substrates serving as light-scattering front contacts as well as reflective light-scattering metal back contacts. In recent years, a substantial progress in the development of nanophotonic light-trapping schemes has been reported. In order, to further advance the nanophotonic concepts, the role of tailored disorder in these nanophotonic light trapping concepts is investigated. We present a systematic experimental as well as simulation study on the impact of disorder in nanophotonic light-trapping employing periodic grating couplers in thin-film solar cells. Our results demonstrate a spectrally broad enhanced light trapping effect, i.e., a significant improvement of photocurrent generation, after introducing disorder in advanced nanophotonic light trapping concepts which already beat state-of-the-art light trapping concepts.