Berlin 2015 – wissenschaftliches Programm
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 30: P2: Organic Electronics and Photovoltaics
CPP 30.2: Poster
Dienstag, 17. März 2015, 14:00–16:00, Poster B
Surface properties and crystallization behavior of thin films of a high mobility electron-transporting semicrystalline polymer studied with MUSIC-mode AFM — •Mario Zerson1, Martin Neumann1, Dieter Neher2, and Robert Magerle1 — 1Fakultät für Naturwissenschaften, Technische Universität Chemnitz, Chemnitz, Germany — 2Institute of Physics and Astronomy, University of Potsdam, Potsdam-Golm, Germany
We study the crystallization behavior, the surface structure, and the nanomechanical properties of the thiophene-based semiconducting copolymer P(NDI2OD-T2) using multi-set point intermittent contact (MUSIC) mode atomic force microscopy (AFM). The influence of the annealing temperature and the film thickness on the resulting morphology is studied. The crystalline lamellae form larger domains which differ in the effective tip-sample interaction, the energy dissipated between the tip and the sample, and the tip indentation into the surface. The two types of domains are attributed to the two known crystalline forms of P(NDI2OD-T2). In contrast to other semicrystalline polymers, we detect no amorphous top layer; the edges of the crystalline lamellae are exposed to the surface. The tip indentation into the surface is attributed to the thickness of the layer of side chains, which covers the edges of the crystalline lamellae. Films annealed at 320°C form terraces with a step height of 2.2 nm. The terraces are formed by the edges of closely spaced crystalline lamellae. The step height between adjacent layers correspond to the height of monomolecular layers of edge-on oriented polymer chains.