Dresden 2011 – wissenschaftliches Programm

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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: Vortrag

Montag, 14. März 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 β_bilayer–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.