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Benzo[1,2-b:4,5-b′]dithiophene-based copolymers applied in bottom-contact field-effect transistors

✍ Scribed by Mark A.M. Leenen; Fabio Cucinotta; Wojciech Pisula; Jürgen Steiger; Ralf Anselmann; Heiko Thiem; Luisa De Cola

Book ID: 104088324
Publisher: Elsevier Science
Year: 2010
Tongue: English
Weight: 943 KB
Volume: 51
Category: Article
ISSN: 0032-3861
DOI: 10.1016/j.polymer.2010.05.022

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✦ Synopsis

Three copolymers of benzo[1,2-b:4,5-b 0 ]dithiophene and 3,3 0 -bis(alkyl)-5,5 0 -bithiophene (dodecyl, tetradecyl and hexadecyl side chains) have been synthesized through Stille copolymerization. The polymers have number-average molecular weights over 20 kg/mol, are well-packed in the bulk and thin film, and possess an ionization potential of À5.1 eV in thin film, which offers stability versus oxidation in environmental conditions. The thin film packing of the polymer with dodecyl side chains leads to an excimeric emission upon excitation, which is not observed for longer side chain lengths. The presence of the dimers responsible for this excimer formation results in a device performance improvement as well. Field-effect transistors fabricated from these copolymers have On/Off ratios >10 7 , equal saturation and linear hole mobilities above 10 À2 cm 2 /Vs, almost no hysteresis and turn-on voltages around 0 V in bottom-contact devices.

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