Dresden 2011 – scientific programme
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DS: Fachverband Dünne Schichten
DS 14: Organic Electronics and Photovoltaics HL-I (jointly with CPP, HL, and O)
DS 14.4: Talk
Monday, March 14, 2011, 18:30–18:45, FOE Anorg
In-situ characterization of molecular semiconductor donor-acceptor-blends — Lena Kristin Cornelius, •Max Beu, and Derck Schlettwein — Institute of Applied Physics, Justus-Liebig-University Giessen, Germany. email:schlettwein@uni-giessen.de
Blends of F16PcCu and PcCu were prepared on glass by physical vapour deposition. The acquired thin films had a thickness of around 20nm. The co-evaporation of PcCu and F16PcCu was varied to obtain different molecular mixtures. High admixture of PcCu to F16PcCu as typically used in bulk-hetero-junctions were compared to very low admixtures typical for dopant interactions. The current-voltage characteristics were studied during evaporation (in-situ). High levels of PcCu in F16PcCu (moderate per cent range) disturbed the charge flow in the films. Very little admixture of PcCu in the low per mille range, however, led to an increased conductivity, indicating a successful dopant interaction. Optical transmission spectroscopy consequently showed the disturbance of the F16PcCu solid state structure. The dominant βbilayer–structure of pure F16PcCu (highly conductive) was partly changed to the herringbone β–structure (less conductive). Consequences for photoconduction in the films will be discussed.