Regensburg 2004 – wissenschaftliches Programm
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SYOH: Organic and Hybrid Systems for Future Electronics
SYOH 5: Poster
SYOH 5.72: Poster
Donnerstag, 11. März 2004, 18:00–21:00, B
Effect of Molecular Weight and Annealing of Poly(3-hexylthiophene)s on the Performance of Organic Field Effect Transistors — •Achmad Zen1, Frank Jaiser1, Dieter Neher1, Jens Pflaum2, Stephan Hirschmann2, Jürgen Rabe3, Wei Zhuang3, Ullrich Scherf4, and Udom Asawapirom4 — 1University of Potsdam, Institute of Physics, Am Neuen Palais 10, D-14469 Potsdam — 2University of Stuttgart, Institute of Physics, Pfaffenwaldring 57, D-70569 Stuttgart — 3Humboldt University, Department of Physics, Newtonstr. 15, D-12489 Berlin — 4University of Wuppertal, Macromolecular Chemistry, Gauss-Str.20, D-42097 Wuppertal
Details on the performance of polymer OFETs prepared from P3HT with different molecular weights are presented. Lowering the molecular weight of P3HTs dramatically decreases the mobility of the transistors. This is mainly explained by the ability of the high-molecular weight fractions to form well-ordered domains with planar backbone conformation at room temperature and its low density of defects. On the other hand, we observe a larger degree of crystallization for the low molecular weight fractions, in accordance to recent publications by others. Based on experiments performed at elevated temperatures and on annealed samples, we, however, conclude that crystallinity is not the major factor controlling the performance of these OFETs.