A Novel Alkylated Indacenodithieno[3,2-b]thiophene-based Polymer for Highperformance

A novel rigid donor monomer, indacenodithieno[3,2-b]thiophene (IDTT), containing linearalkyl chains is reported. Co-polymers of IDTT with the acceptor benzothiadiazole (BT) isshown to be excellent p-type semiconductors in organic field effect transistors (OFET).Devices based upon conventional top gate architectures with pentafluorobenzenethiolmodified Au electrodes exhibited a hole mobility up to 6.6 cm2V-1s-1 after thermal annealing.We also demonstrate for the first time that treatment of the electrodes with solution depositedcopper(I) thiocyanate (CuSCN) interfacial layer has a beneficial hole injection/electronblocking effect, further enhancing mobility to 8.7 cm2V-1s-1.