W. Zhang, Y. Han, X. Zhu, Z. Fei, Y. Feng, N.D. Treat, H. Faber, N. Stingelin, I. McCulloch,
Adv. Mater., 28,
A novel rigid donor monomer, indacenodithieno[3,2-b]thiophene (IDTT), containing linear alkyl chains, is reported. Its copolymer with benzothiadiazole is an excellent p-type semiconductor, affording a mobility of 6.6 cm2 V−1 s−1 in top-gated field-effect transistors with pentafluorobenzenethiol-modified Au electrodes. Electrode treatment with solution-deposited copper(I) thiocyanate (CuSCN) has a beneficial hole-injection/electron-blocking effect, further enhancing the mobility to 8.7 cm2 V−1 s−1.