A Novel Alkylated Indacenodithieno[3,2-b]thiophene-based Polymer for High-performance Field Effect Transistors - Heeney, MJ; Han, Y; Fei, Z; McCulloch, I; Stingelin, N; Treat, N; Anthopoulos, T; Faber, H; Zhang, W; Zhu, X; Feng, Y (Advanced Materials, 2015)