Synthesis and Thin-Film Transistor Performance of Poly(4,8-didodecylbenzo1,2-b:4,5-b‘dithiophene)

The synthesis of novel regioregular poly(4,8-didodecylbenzo1,2-b:4,5-b‘dithiophene) and its use as a semiconductor in organic thin-film transistors (OTFTs) are described. The polymer was prepared from 2,6-dibromo-4,8-didodecylbenzo1,2-b:4,5-b‘dithiophene by a dehalogenative coupling polymerization. A field-effect mobility of ∼0.012 cm2 V-1 s-1 and a current on/off ratio of ∼2.5 × 105 have been obtained with OTFTs using this polymer semiconductor.