1. Evonik Degussa GmbH, Creavis, Technologies and Innovation, Paul‐Baumann‐Stra?e 1, D‐45764 Marl, Germany;2. Physikalisches Institut and Center for Nanotechnology, CeNTech, Universit?t Münster, Mendelstra?e 7, D‐48149 Münster, Germany;3. Max Planck Institute for Polymer Research, Ackermannweg 10, D‐55128 Mainz, Germany;4. Evonik Degussa GmbH, Process Technology and Engineering, Process Technology, New Processes, Rodenbacher Chaussee 4, D‐63457 Hanau‐Wolfgang, Germany
Abstract:
Benzo1,2‐b:4,5‐b′]diselenophene (BDS) has been incorporated for the first time in a polymer. bis(Stannyl)‐functionalized BDS was copolymerized with 3,3′‐bis(alkyl)‐5,5′‐bithiophenes (dodecyl and tetradecyl side chains) through Stille copolymerization, to yield p‐type polymer semiconductors for organic field‐effect transistor application. The electronic and structural effect of the selenium atoms, compared to sulphur atoms in analogous copolymers, is described. The molecular weight has a decisive influence on the photophysical properties and supramolecular ordering, expressed in field‐effect transistor measurements. Saturation mobilities around 10?2 cm2 · V?1s?1 are obtained on standard silicon substrates.
