Hamburg 2009 – scientific programme
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MO: Fachverband Molekülphysik
MO 13: Molekülphysik Poster 1
MO 13.6: Poster
Tuesday, March 3, 2009, 16:30–19:00, VMP 8 Foyer
Substituted dipolar phenothiazines for efficient dye-sensitized solar cells — •Matthias Stolte1, Thomas Müller2, Martina Hauck2, and Hans-Georg Kuball1 — 1Department of Chemistry, Technische Universität Kaiserslautern, 67663 Kaiserslautern, Germany — 2Department of Macromolecular and Organic Chemistry, Heinrich-Heine Universität Düsseldorf, 40225 Düsseldorf, Germany
Since Grätzel [1] et al. reported about high solar energy-to-electricity conversion for dye-sensitized solar cells much efford was spent on the synthesis of organic chromophores. The electron rich heterocycle phenothiazine exhibit an intensive charge transfer upon excitation with UV/VIS light. Tuning of the optical and electrochemical properties by different strong donor and acceptor groups and variation of the substitution pattern give excess to a huge variety of promising candidates for dye-sensitized solar cells. In this work we present the physico-chemical characterization, including cyclic voltammetry, electro-optical absorption and emission spectroscopy of two series of push-pull chromophores containing phenothiazine as a donor group. Especially changes of polarity can be probed by measurement of the electrochromism of the chromophores in solution. A new highly sensitive and also automated spectrometer for electrooptical absorption spectroscopy was developed in our group in order to obtain properties of the ground and the lowest excited state. The influence of different polar substituents on the chromophore will be discussed on the basis of experimental data as well as DFT calculations.
[1] B. O Regan, M. Grätzel, Nature 1991, 353, 737.