Regensburg 2010 – scientific programme
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DS: Fachverband Dünne Schichten
DS 26: [CPP] Organic Electronics and Photovoltaics III (Joint Session DS/CPP/HL/O)
DS 26.9: Talk
Wednesday, March 24, 2010, 11:45–12:00, H37
Semitransparent small-molecule organic solar cells — •Jan Meiss1, Christian Uhrich2, Stefan Sonntag2, Wolf-Michael Gnehr2, Martin Pfeiffer2, Karl Leo1, and Moritz Riede1 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany — 2heliatek GmbH, Liebigstraße 26, 01187 Dresden, Germany
Semitransparent, colourful solar cells are of interest for a wide range of applications, e.g. sun shading of residential and office buildings or cars. Previously, among organics-containing devices, only semitransparent dye-sensitized solar cells showed power conversion efficiencies (PCE) that allowed first meaningful applications, whereas semi-transparent small-molecule organic solar cells (OSC) were limited to PCE well below 1%.
We present small-molecule semitransparent OSC deposited by thermal vacuum evaporation on ITO-coated glass. The organic materials include absorber materials and doped dedicated charge transport layers. Due to our unique device architecture, the top electrode is ITO-free, consisting only of an ultra-thin multi-layer metal film.
The OSC exhibit light transmission in the visible range of 30-50% with PCE of over 2%. Organic capping layers are used to significantly lower reflection and increase transmission without significant loss of PCE. Furthermore, we have achieved first large-area semitransparent tandem OSC with 3.5% PCE at 20-40% transmission in the visible range on 4cm2, which show the potential of this type of device for large-scale building integration.