Regensburg 2013 – wissenschaftliches Programm

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DS: Fachverband Dünne Schichten

DS 32: Poster Session IV: Atomic layer deposition; Organic thin films; Organic Electronics and Phototovoltaics; Organic Materials for Spintronics - from spinterface to devices; Thin film photovoltaic materials and solar cells

DS 32.50: Poster

Donnerstag, 14. März 2013, 17:00–20:00, Poster B2

preparation of Cu₂ZnSn(S,Se)₄ thin films and solar cells by chemical bath deposition — •chao gao¹, thomas schnabel², erik ahlswede², michael powalla^2,3, heinz kalt¹, and michael hetterich¹ — ¹Institute of Applied Physics, Karlsruhe Institute of Technology (KIT), 76128 Karlsruhe, Germany — ²Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), 70565 Stuttgart, Germany — ³Light Technology Institute (LTI), Karlsruhe Institute of Technology (KIT)

Cu₂ZnSn(S,Se)₄ (CZTSSe) is a promising absorber material for thin-film solar cells. It has the suitable optical band-gap for photovoltaic energy conversion, a high optical absorption coefficient, and all its constituent elements are abundant and non-toxic. Here we show a low-cost aqueous solution approach to prepare Cu₂ZnSn(S,Se)₄ thin films: SnS/CuS/ZnS precursor layers were prepared by chemical bath deposition firstly and then the precursor films were selenized in a graphite box under inert gas atmosphere. By optimizing the fabrication parameters, CZTSSe thin films with good quality could be obtained. The films were characterized by XRD, SEM, EDX, etc. Finally, first CZTSSe solar cells could be fabricated the properties of which will be discussed in our contribution.