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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 35.26: Poster

Wednesday, April 2, 2014, 17:00–20:00, P1

Cu₂ZnSnSe₄ layers and solar cells from selenized coevaporated precursors — •Timo Musiol¹, Chao Gao¹, Thomas Schnabel², Mario Lang¹, Christoph Krämmer¹, 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

Cu(In,Ga)Se₂ (CIGS) is a well-established absorber material for thin-film solar cells and efficiencies up to 20.8% have been demonstrated. Due to its earth-abundant components, kesterite Cu₂ZnSn(S,Se)₄ is a very promising alternative. In this contribution we present results for Cu₂ZnSnSe₄ (CZTSe) layers fabricated by coevaporation of Cu, Zn, Sn, and Se, followed by a high-temperature selenization step. The layers are investigated with various techniques such as Raman spectroscopy, X-ray diffration, and photoluminescence spectroscopy. Based on CZTSe absorbers, solar cells have been processed and investigated. I–V data indicates that a conversion efficiency of up to 4.7% is achieved in these devices.