Dresden 2014 – scientific programme
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CPP: Fachverband Chemische Physik und Polymerphysik
CPP 37: Poster Session 2
CPP 37.33: Poster
Wednesday, April 2, 2014, 15:00–19:00, P3
Crystallinity Determination of Poly(3-hexyl thiophene) Thin Films by Means of Fast Scanning Calorimetry — •Jens Balko1, Sophie Seidel1, Andreas Wurm2, Christoph Schick2, and Thomas Thurn-Albrecht1 — 1Institute of Physics, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany — 2Institute of Physics, University of Rostock, 18057 Rostock, Germany
Poly(3-hexyl thiophene) (P3HT) is a common polymer semiconductor, often used as material or component in organic field effect transistors or solar cells. The crystallinity of this semicrystalline material is among other parameters governing the electronic mobility. Fast scanning calorimetry allows studying samples with masses ranging from several ng to µg and scanning rates not accessible by conventional DSC. Using the extrapolated reference melting enthalpy of a 100% crystalline material obtained in bulk1, we determined the crystallinity in thin films of a commercial P3HT. The mass of the thin film samples was determined by calibrating the heat capacity in molten state. The crystallinity decreases by a factor of 5 starting from the bulk value for thick films down to films having 25 nm thickness. Cooling rate dependent measurements indicate that the reduced crystallinity is not due to a change in crystallization kinetics.
1 J. Balko et al., resubmitted to Macromolecules