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DS: Fachverband Dünne Schichten
DS 35: Poster I: Application of thin films; Focus session: Sensoric micro and nano-systems; Focus Session: Sustainable photovoltaics with earth abundant materials; Graphen (joint session with TT; MA; HL; DY; O); Ion and electron beam induced processes; Layer properties: electrical, optical, and mechanical properties; Magnetic/organic interfaces, spins in organics and molecular magnetism; Micro- and nanopatterning (jointly with O); Organic electronics and photovoltaics (jointly with CPP, HL, O); Thermoelectric materials
DS 35.27: Poster
Mittwoch, 2. April 2014, 17:00–20:00, P1
Polycrystalline Cu2ZnSnSe4 layers on GaAs(001) with a preferential grain orientation — •Johannes Sachs1, Christoph Krämmer1, Mario Lang1, Chao Gao1, Michael Powalla2, Heinz Kalt1, and Michael Hetterich1 — 1Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany — 2Light Technology Institute, KIT, and Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany
Due to its earth-abundant components the kesterite Cu2ZnSnSe4 (CZTSe) material system is a very promising alternative to Cu(In,Ga)Se2. However, material properties such as the band structure or the impact of grain boundaries on solar cell performance are still poorly understood. In order to investigate these properties further, high-quality layers of CZTSe would be highly desirable. Towards this aim, we introduce a two-step fabrication approach which is based on the selenization of Sn/Cu/ZnSe(001) structures on GaAs(001) substrates. X-ray diffraction and Raman measurements do not only confirm the formation of the kesterite phase but also indicate a preferential orientation of the CZTSe grains in all three dimensions.