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SYOE: Symposium Organic Thin Film Electronics: From Molecular Contacts to Devices
SYOE 8: Poster Session SYOE
SYOE 8.62: Poster
Dienstag, 27. März 2007, 18:00–20:00, Poster B
Comparison of different anode materials in efficient small molecule organic solar cells — •Kerstin Schulze1, Bert Männig1, Martin Pfeiffer1, Karl Leo1, Yuto Tomita2, Christian May2, Eduard Brier3, Egon Reinold3, and Peter Bäuerle3 — 1Institut für Angewandte Photophysik, Technische Universität Dresden, George-Bähr-Str. 1, 01069 Dresden, Germany, www.iapp.de — 2Fraunhofer IPMS, Maria-Reiche-Straße 2, 01109 Dresden, Germany — 3Abteilung Organische Chemie II, Universität Ulm, 89081 Ulm, Germany
We present efficient organic solar cells using two different transparent conductive oxides (TCOs) as anode material: Indium Tin Oxide (ITO) and Aluminium doped Zinc Oxide (ZAO). As shown by our group before photovoltaic devices using an oligothiophene derivative as donor and fullerene C60 as acceptor reach power efficencies of up to 3.4 % [1]. In a similar way, organic solar cells using a new kind of this oligothiophene derivative and C60 with comparable power efficiencies will be presented in combination with different anode materials. The open-circuit voltage (Voc) of these heterojunction solar cells is defined by the Fermi-levels of the free charge carriers in the active materials. The influence of the workfunction of the TCO on the performance of the photovoltaic device will be presented. Additionally, the IV-curves of these solar cells depend on the kind of the oligothiophene derivative and this will be discussed on two oligothiophene types as well.
[1] K. Schulze, C. Uhrich, R. Schüppel, K. Leo, M. Pfeiffer, E. Brier, E. Reinold, P. Bäuerle, Adv. Mater. 18, 2872 (2006)