Regensburg 2013 – wissenschaftliches Programm

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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

Donnerstag, 14. März 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 Hetterich¹ — ¹Institute 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.