We report on the optoelectronic properties of vacuum sublimed organic thin films of the oligothienyls (Tn model systems. The Davydov splitting (DS) of the lowest exciton is about 0.3 eV and decreases with the conjugation length when going from T4 to T6. The lowest DS component is partially forbidden due to the crystal packing and the spectral activity occurs via Herzberg-Teller (HT) vibronic coupling. We show the real time dynamics of the HT coupling by coherent vibrational spectroscopy and the role of aggregates in the energy transfer processes within the films.
Nanostructured organic thin films: Electronic energetics and devices / Taliani, C.; Biscarini, F.; Lunedei, E.; Mei, P.; Muccini, M.; Murgia, M.; Schneider, M.; Lanzani, G.. - In: INTERNATIONAL JOURNAL OF MODERN PHYSICS B. - ISSN 0217-9792. - 15:28-30(2001), pp. 3722-3726. (Intervento presentato al convegno 2000 International Conference Excitonic Processes in Condensed Matter tenutosi a . nel .) [10.1142/s0217979201008512].
Nanostructured organic thin films: Electronic energetics and devices
Biscarini F.;
2001
Abstract
We report on the optoelectronic properties of vacuum sublimed organic thin films of the oligothienyls (Tn model systems. The Davydov splitting (DS) of the lowest exciton is about 0.3 eV and decreases with the conjugation length when going from T4 to T6. The lowest DS component is partially forbidden due to the crystal packing and the spectral activity occurs via Herzberg-Teller (HT) vibronic coupling. We show the real time dynamics of the HT coupling by coherent vibrational spectroscopy and the role of aggregates in the energy transfer processes within the films.
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