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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 35.25: Poster
Wednesday, April 2, 2014, 17:00–20:00, P1
A low-cost solution method to fabricate Cu2ZnSn(S,Se)4 solar cells — Chao Gao1, Thomas Schnabel2, •Christoph Krämmer1, Erik Ahlswede2, Michael Powalla2,3, 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 (LTI), Karlsruhe Institute of Technology (KIT), 76131 Karlsruhe, Germany
Cu2ZnSn(S,Se)4 is a promising absorber material to fabricate high-efficiency environmentally friendly solar cells. Here a low-cost solution method has been developed to fabricate Cu2ZnSn(S,Se)4 solar cells. For the preparation, first SnS, CuS, and ZnS layers are successively deposited on a molybdenum/soda-lime glass substrate by chemical bath deposition, then the Cu2ZnSn(S,Se)4 thin films are obtained by a selenization process utilizing a graphite box in a tube furnace. The obtained Cu2ZnSn(S,Se)4 thin films show good crystallization and no obvious evidence for impurity phases except ZnSe is found in the selenized films. By optimizing the preparation process of the Cu2ZnSn(S,Se)4 thin films, Cu2ZnSn(S,Se)4 solar cells with efficiencies up to 3.2 % can be obtained. Current-voltage and quantum efficiency measurements imply that a barrier may exist at the Cu2ZnSn(S,Se)4/CdS interface that could be the limiting factor for the solar cell efficiency.