Berlin 2015 – wissenschaftliches Programm
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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
Mittwoch, 18. März 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.