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Regensburg 2013 – scientific programme

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.49: Poster

Thursday, March 14, 2013, 17:00–20:00, Poster B2

optical investigation of kesterite and CIGS solar cell absorber layers — •David Sperber1, Christoph Krämmer1, Chao Gao1, Manuel Löw2, Thomas Schnabel2, Erik Ahlswede2, Michael Powalla2, Heinz Kalt1, and Michael Hetterich11Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), Karlsruhe, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff- Forschung Baden-Württemberg (ZSW), Stuttgart, Germany

CIGS is a well-established absorber material for thin film solar cells and efficiencies above 20% have been demonstrated. Due to its abundant components kesterite Cu2ZnSn(S,Se)4 is a very promising alternative. However optical properties and the band structure of this material are still not entirely understood. We investigate kesterite solar cells and absorbers using modulation spectroscopy techniques. The results of temperature dependent electroreflectance and photoreflectance measurements to detect fundamental and higher optical transitions will be presented and discussed.

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