Benzimidazole derivatives of perylene diimide for organic field-effect transistor

Abstract

The poor solubility of perylene derivatives has been a key factor that prohibits the application of these thermally stable compounds in organic field-effect transistors (OFET) devices. In this research, the effort to enhance the solubility and exploring FET property of benzimidazole derivatives of perylene diimide were investigated. The perylene diimide core structure was functionalized by aryloxy moieties. Unfortunately, the isomeric products were still poorly soluble in common organic solvents, which made them impossible to separate and purify. Thus, the synthetic plan and goal were completely revised to the benzotriazatruxene derivatives, which were highly soluble in organic solvents such as dichloromethane and toluene. It was found that these newly designed compound were not suitable for OFET application, However, the C3-symmetric benzotriazatruxene containing hexyl group exhibited better hole transporting properties than the commercial N,N′-Bis(3-methylphenyl)-N,N′-diphenylbenzidine (TPD).