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SYOP: Symposium Organic Photovoltaics: From Single Molecules to Devices
SYOP 4: Organic Photovoltaics: from Single Molecules to Devices
SYOP 4.32: Poster
Donnerstag, 26. März 2009, 16:30–19:00, P1A
The properties of metastable PcVO modifications in evaporated thin-films — •Indro Biswas, Heiko Peisert, and Thomas Chassé — Institut f. Phys. u. Theor. Chemie, Universität Tübingen
Vanadyle phthalocyanine (PcVO) and perfluorinated vanadyle phthalocyanine (F16PcVO) are small molecule organic semiconductors with a nonplanar distortion and a permanent dipole. The nonfluorinated material can be evaporated in two different thin-film modifications, (one of which is metastable and is transformed into its stable form by heating up to 200∘C.) [1] In this work we present radiative (photoemission spectroscopy) and non-radiative (Kelvin probe measurements) investigations of evaporated thin-films. Depending on the method two different types of interface formation are observed. It can be shown, that the metastable form is converted under the influence of irradiation, i.e. the UV light provides the energy for the phase transition.
The Kelvin probe method gives the possibility to examine samples with a minimum amount of perturbation, where common spectroscopic techniques may change a sample due to the applied radiation.
[1] C. H. Griffiths, M. S Walker, P. Goldstein, Mol, Cryst. Liq. Cryst. 33 (1976) 149.