Dresden 2020 – scientific programme
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DS: Fachverband Dünne Schichten
DS 30: Poster: Organic Thin Films and Thin Oxides
DS 30.4: Poster
Wednesday, March 18, 2020, 15:00–18:00, P1A
Nanoscale Polarization-Resolved Surface Photovoltage of a Pleochroic Squaraine Thin Film — •Frank Balzer1, Oliya S. Abdullaeva2, Angelika Maderitsch2, Matthias Schulz3, Arne Lützen3, and Manuela Schiek2 — 1University of Southern Denmark, Sønderborg, Denmark — 2University of Oldenburg, Germany — 3University of Bonn, Germany
Local polarized surface photovoltage (SPV) and UV-vis spectroscopy are used to characterize a squaraine:fullerene (SQIB:PCBM) photovoltaic layer blend, which has shown potential to act as neurostimulating platform. The molecular model squaraine donor material SQIB is known to crystallize into two polymorphs upon thermal annealing with distinct polycrystalline thin film texture. For the orthorhombic polymorph, the anisotropic optical response is dominated by the Davydov-split J-type absorption into an upper (UDC) and lower (LDC) Davydov component within the deep red. Kelvin probe force microscopy (KPFM) maps the differential SPV of the active layer on the nanoscale without complications by interfaces, which is spatially correlated with the pleochroic optical response of the thin film. The SPV shows a wavelength-dependent, bichromatic change upon rotating the polarization axis of the illuminating light. With that, subtler nanoscaled optoelectronic sensing platforms become possible.