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Berlin 2015 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 61: Posters III (Organic-inorganic perovskite semiconductors; Organic photovoltaics and electronics; Photovoltaics; Energy science; New materials and concepts)

HL 61.32: Poster

Wednesday, March 18, 2015, 15:00–20:00, Poster F

Solution-based fabrication of kesterite Cu2ZnSnSe4 absorber layers and solar cells — •Markus Neuwirth1, Huijuan Zhou1, Chao Gao1, Mario Lang1, Christian Zimmermann1, Christoph Krämmer1, Christian Huber1, Alexander Schiele1, Thomas Schnabel2, Tobias Abzieher2, Erik Ahlswede2, Michael Powalla2,3, Heinz Kalt1, and Michael Hetterich11Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany — 3Light Technology Institute, KIT

In the race for new energy sources, Cu2ZnSnSe4 (CZTSe) thin-film solar cells play a promising role since the absorber only comprises environmentally friendly and earth-abundant elements. Our fabrication approach for CZTSe consists of a cheap and simple solution-based two-step process that spares toxic solvents such as hydrazine. Utilizing a doctor-blading process we are able to form reproducible homogeneous precursors that transform into CZTSe by subsequent thermal annealing in a Se atmosphere. An automated buffer layer deposition process also increases the reproducibility of the overall sample quality. X-ray diffraction, Raman spectroscopy and external quantum efficiency measurements provide a better understanding of the kesterite absorber properties and their influence on cell performance.

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