Compound with indolocarbazole moieties and devices containing such compound

A thin film transistor comprising:

• (a) a gate dielectric layer;
• (b) a gate electrode;
• (c) a semiconductor layer;
• (d) a source electrode;
• and
• (e) a drain electrode,
• wherein the gate dielectric layer, the gate electrode, the semiconductor layer, the source electrode, and the drain electrode are in any sequence as long as the gate electrode and the semiconductor layer both contact the gate dielectric layer, and the source electrode and the drain electrode both contact the semiconductor layer, and
• wherein the semiconductor layer includes a compound comprising a plurality of optionally substituted indolocarbazole moieties, which are the same or different from each other, wherein the covalent bonding between adjacent optionally substituted indolocarbazole moieties is a single covalant bond, wherein the indolocarbazole moieties are independently selected from the structures (A), (B), (C), (D), (E), (F) and (G), or a mixture thereof:
• wherein for each of the structures (A) through (G), each R is independently selected from a group consisting of a hydrogen, a hydrocarbon group and a heteroatom-containing group, wherein each of the structures (A) through (G) is optionally peripherally substituted by a substituent selected from a group consisting of:
• Cl, Br and —C8H17;
• wherein the hydrocarbon group contains from 1 to 50 carbon atoms and is independently selected from a group consisting of:
• a straight chain alkyl group, a branched alkyl group, a cyclic aliphatic group, an aryl group, an alkylaryl group, and an arylalkyl group;
• wherein the heteroatom-containing group contains from 2 to 200 atoms and is independently selected from a group consisting of:
• alkoxyaryl, arylalkoxy, fluoroalkyl, fluoroaryl, cyano, nitro, carbonyl, carboxylate, amino, alkoxy having 1 to 18 carbon atoms, and thienyl.