Engineering the morphologies and charge transport properties of newly synthesized dibenzochrysene-based small molecules by attaching various side groups

Abstract

The microstructure of small molecular semiconductors can be readily altered via side group-engineering although they have same conjugated core. Here, we study a variation of morphology and charge transport properties about derivatives of triethylsilylethynyl-modified dibenzochrysene (TES-DBC) depending on side group size. It was verified that the TES-DBC combined with smaller side group developed more favorable morphology to charge carrier transport. The TES-DBC derivative with thienyl (DTTES-DBC), the smallest side group, formed well-connected crystal domain with well-ordered molecular assemblies which facilitate fast charge carrier transport. In addition, a high (1,2,4-trichlorobenzene; TCB) and low (chlorobenzene; CB) boiling point was used as processing solvent to observe the effect of the film fabrication time on the molecular ordering according to side group size. (C) 2016 Elsevier Ltd. All rights reserved.