Dresden 2011 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.29: Poster
Montag, 14. März 2011, 17:30–19:30, P2
Fluorinated hexaazatrinaphthylene (HATNA) derivatives as electron transport materials for organic solar cells — •Franz Selzer1, Christiane Falkenberg1, Martin Baumgarten2, Manuel Hamburger2, Klaus Müllen2, Karl Leo1, and Moritz Riede1 — 1TU Dresden, Institut für Angewandte Photophysik, George-Bähr-Str. 1, 01062 Dresden, Germany — 2Max Planck Institute for Polymer Research, 55128 Mainz, Germany
For optimizing small molecule organic solar cells the so-called p-i-n concept is a versatile approach. Here, the photoactive donor-acceptor heterojunction is sandwiched between a transparent p-doped hole transport layer and an n-doped electron transport layer. The transport layers not only facilitate the charge carrier extraction but also act as window layers shifting the maximum of the optical interference pattern to the absorbing layers. While there are a number of well suited hole transport materials, the choice of transparent electron transport materials (ETM) with high electron mobility and conductivity as well as thermal and morphological stability is very limited. Here, we present fluorinated hexaazatrinaphthylene (HATNA) derivatives as ETM in p-i-n type solar cells in comparison with the commonly used n-doped C60 or chlorinated HATNA. While C60 absorbs in the visible range of the sun spectrum, HATNA has an optical band gap of 2.9eV. Doping with either acridine orange base (AOB) or NDN1 (Novaled AG) leads to an increase of the conductivity by several orders of magnitude to σ > 1·10−6 S/cm. Finally, we show that it is possible to replace n-C60 in the solar cell stack by n-doped fluorinated HATNA.