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Enhanced Charge Transport in Polymer Thin-Film Transistors Prepared by Contact Film Transfer Method

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journal contribution
posted on 25.11.2009, 00:00 by Qingshuo Wei, Shoji Miyanishi, Keisuke Tajima, Kazuhito Hashimoto
The charge-carrier transport in the structures formed at the surface of various conjugated polymer films is investigated by constructing organic thin-film transistors using a novel and simple contact film transfer method. Thin-film transistors prepared by this transfer process have higher field-effect mobility values compared with conventional spin-coated devices for all the studied polymers. In contrast to previous reports, the hole mobility in regioregular poly(3-alkylthiophene)s does not depend on the length of the alkyl chain when the contact film transfer method is used. These results suggest that the thiophene rings adopt a highly ordered edge-on orientation and strong interchain π−π interactions spontaneously form at the polymer/air interface during the spin coating.