Solution-processed self-assemble engineering PDI derivative polymorphisms with optoelectrical property tuning in organic field-effect transistors

The crystal polymorphism study leads to an explosion of science research, related to many fields, such as organic semiconductors, pharmaceuticals, pigments, food, and explosives. Two different crystal phases of a perylene diimide derivative (4FPEPTC) have been prepared via a simple and efficient solution method. Via changing the concentration of the solution, we observed the polymorphisms clearly, wire-shape (α phase) and ribbon-like (β phase) crystals differed in the stacking mode and short-contacts. Moreover, the as-prepared n-channel microcrystal-based devices demonstrated distinct electron mobilities that of α phase architecture higher than β phase structure and obvious photoresponse discrepancy. Theoretical calculations further confirmed this phenomena, which help us to understand the structure-property relationship in this crystal polymorph. Our study indicates that the investigation of polymorphisms could be considered as a very useful method to realize functional property modulation and benefits the development of organic (opto)electronics.