Berlin 2018 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 85: Molecular films: Photovoltaics, electronics and morphology (joint session O/CPP)
CPP 85.2: Talk
Friday, March 16, 2018, 10:45–11:00, MA 144
Polarized-Light Induced Contact Potential Differences in Small-Molecule Organic Aggregates and Thin Films — •Frank Balzer1, Matthias Schulz2, Oliya S. Abdullaeva3, Arne Lützen2, and Manuela Schiek3 — 1University of Southern Denmark, MCI, Sønderborg, Denmark — 2University of Bonn, Germany — 3University of Oldenburg, Germany
Crystalline organic thin films often exhibit linear dichroism and birefringence. Illumination with polarized light might therefore lead to polarization dependent changes of the electric surface potential. Here, we present results for birefringent and dichroic nanofibers from functionalized para-quaterphenylene molecules [1], and for thin films and thin film blends from an dihydroxy anilino squaraine (SQIB) [2]. Considerable differences in the light-induced changes of the surface potential are observed, probed by Kelvin probe force microscopy (KPFM). These changes are associated with the local molecule orientation within the samples.
[1] J. Chem. Phys. 146 (2017) 134704. [2] Cryst. Growth Des. (2017), doi: 10.1021/acs.cgd.7b01131.