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Copolythiophenes with hydrophilic and hydrophobic side chains: Synthesis, characterization, and performance in organic field effect transistors

: Bilkay, T.; Schulze, K.; Egorov-Brening, T.; Bohn, A.; Janietz, S.


Macromolecular chemistry and physics 213 (2012), Nr.18, S.1970-1978
ISSN: 1022-1352
Fraunhofer IAP ()

Statistical copolymers of regioregular polythiophene with hydrophobic hexyl side chains (P3HT) and hydrophilic 3,6-dioxaheptyl side chains (P3DOHT) are synthesized by the GRIM method. A comparable study on the different polymers has been accomplished regarding solubility, thin film structure, and performance in organic field effect transistors (OFETs). DSC and XRD measurements are done to investigate the crystallinity of the copolymers. The novel functionalized fully pi-conjugated copolymers P(3HT-co-3DOHT) with feed molar ratios of 1:1, 2:1, and 1:2 show hole mobilities in the range of 10(exp -2) cm2 V(exp -1) s(exp)-1. Using poly(methyl methacrylate) as the dielectric layer in a top gate device architecture leads to air stable transistors without significant losses in the OFET performance over several months.