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 Powalla^2,3, Heinz Kalt¹, and Michael Hetterich¹ — ¹Institute 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.