Synthesis and thin-film transistor performance of poly(4,8-didodcylenzo[1,2-b:4,5-b′]dithiophene)

The synthesis of novel regioregular poly( 4,8-didodecylbenzo[ 1,2-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-didodecylbenzo[ 1,2-b: 4,5-b']dithiophene by a dehalogenative coupling polymerization. A field-effect mobility of similar to 0.012 cm(2) V-1 s(-1) and a current on/off ratio of similar to 2.5 x 10(5) have been obtained with OTFTs using this polymer semiconductor.