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Optical Properties of Blends: Influence of Mixing-Induced Disorder in Pentacene:Diindenoperylene versus Perfluoropentacene:Diindenoperylene
journal contribution
posted on 2013-07-11, 00:00 authored by K. Broch, A. Aufderheide, L. Raimondo, A. Sassella, A. Gerlach, F. SchreiberThe optical properties of mixed films
of pentacene:diindenoperylene
and perfluoropentacene:diindenoperylene in various mixing ratios are
studied using spectroscopic ellipsometry and polarization dependent
transmission spectroscopy. Compared to the spectra of films of the
pure compounds, the absorption spectra of the blends are found to
be significantly influenced by interactions of the comixed compounds
and the mixing-induced disorder. On the basis of the comparison of
the two mixed systems, we address the effects of mixing and ordering
behavior on the specific optical transitions of the different blends
by analyzing the line shape of the spectra and the energy positions
and widths of the characteristic peaks. The results are important
for a fundamental understanding of organic semiconductor blends and
possible charge transfer effects in these systems relevant for device
applications.