Novel Peripherally Substituted Indolo[3,2‐b]carbazoles for High‐Mobility Organic Thin‐Film Transistors

Strategically functionalized 5,11‐dialkylindolo[3,2‐b]carbazoles (see Figure) represent a novel class of high‐mobility p‐channel semiconductors for organic thin‐film transistors. Specifically, 2,8‐dichloro‐substituted 5,11‐didodecylindolo[3,2‐b]carbazole, which forms highly crystalline films with large interconnecting terrace‐like layered domain structures, has exhibited mobilities reaching 0.14 cm2 V–1 s–1 and current on/off ratios of 107 under ambient conditions.