| 초록 |
We report the characteristics of pyrene-driven, π−π stacking self-assembly in a benzodithiophene−thienothiophene-based polymer system. They were investigated using measurements of the copolymer optical and electrochemical properties. Various amounts of Py units were successfully incorporated into a control polymer. Concentration-dependent pyrene-driven self-assembly in the copolymers was systematically investigated. We additionally studied the morphological changes using DSC, synchrotron X-ray diffraction analysis, AFM, and TEM. As the Py content increased, the Py−Py interactions favored the formation of different types of interpolymer interactions and partial ordering among the polymer domains. A threshold quantity of the Py moieties enabled the Py−Py interactions to propagate over many polymer chains to form a highly interconnected structure that improved hole transport pathways and, thus, the photovoltaic performances of resulting bulk heterojunction polymer solar cells. |
