Synthesis, Characterization and Field-Effect Transistor Performance of Poly[2,6-bis(3-alkylthiophen-2-yl)benzo[1,2-b;4,5-b′]diselenophene]s

Benzo[1,2‐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. Benzo[1,2‐b:4,5‐b′]diselenophene‐based copolymers have been synthesized by Stille copolymerization. The effect of the selenium atoms and the molecular weight on physical properties and field‐effect transistor performance is discussed.