Dresden 2011 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 8: Poster: Organic Semiconductors
CPP 8.53: Poster
Monday, March 14, 2011, 17:30–19:30, P2
Vibrational analysis of ethyne-linked ZnTPP dimer — •Stephan Peter Kate1, Simona Pop1, Norbert Esser1, Karsten Hinrichs1, Mathias O Senge2, Aoife Ryan2, Jörg Rappich3, and Xin Zhang3 — 1Leibniz Institut für Analytische Wissenschaften - ISAS - e.V., Albert-Einstein-Str.9, D-12489 Berlin, Germany — 2School of Chemistry, SFI Tetrapyrrole Laboratory, Trinity College Dublin, Dublin 2, Ireland — 3Helmholtz-Zentrum Berlin for Materials and Energy GmbH, Institute for Silicon Photovoltaics, Kekuléstrasse 5, Berlin, 12489, Germany
Recently, porphyrin oligomers have attracted much attention as pi-conjugated organic chromophores. Their possible advantages due to their extraordinary optical and electronic properties range from biosensors and organic solar cells to organic field-effect transistors. As a result of the pi-conjugation, the low-lying HOMO-LUMO electronic transitions allows the porphyrin oligomers to collect an extended low-energy part of the solar spectrum towards NIR spectral range. This study employs micro-Raman spectroscopy for the analysis of the vibrational modes of the ethyne-linked ZnTPP (tetraphenylporphyrin) dimer in comparison to its monomer. Their resonance Raman spectra were excited with the 633 nm (1.95 eV; HeNe laser) and 458 nm (2,71 eV; Y laser) emission lines which are located in the Q- and B-band regions of the optical absorption spectrum, respectively. The presence of the Raman-active ethyne stretching mode at 2150 wavenumbers is a finger print of the ethyne bridge used in the pi-conjugation of ZnTPP dimer.