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 61.33: Poster

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

Two-step fabrication process for Cu₂ZnSnSe₄ layers and solar cells on GaAs and molybdenum-coated glass substrates — •Alexander Schiele¹, Chao Gao¹, Mario Lang¹, Christoph Krämmer¹, Thomas Schnabel², Tobias Abzieher², Erik Ahlswede², 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

Cu₂ZnSnSe₄ (CZTSe) is a promising thin-film absorber material due to its earth-abundant, low-cost and non-toxic components. Despite these advantages, CZTSe solar cells have not yet achieved the required efficiency for practical application. Therefore, high-quality absorber layers are necessary in order to perform fundamental material studies and further improve device performance. One way of fabricating such high-quality CZTSe layers is to utilize a precursor layer stack consisting of (epitaxial) ZnSe, Cu, and Sn deposited in a molecular-beam epitaxy system. A subsequent annealing process leads to the formation of CZTSe with large grains which in case of a GaAs(001) substrate inherits the preferential orientation of the monocrystalline ZnSe layer. The influence of GaAs as a substrate compared to molybdenum-coated glass is investigated by X-ray diffraction, Raman spectroscopy, and conversion efficiency measurements of finished solar cells.