Fluorinated Phenylene Unit as a Building Block for High Performance n-Type Semiconducting Polymer

Abstract

Intense research efforts have been devoted to the development of p-type semiconducting polymers for OFETs due to their synthetic accessibility, whereas n-type polymer semiconductors have been scarcely reported, although realization of air-stable and solution-processable n-channel polymers is important to the function of p-n junction diode, organic photovoltaics, and complementary organic circuits. Herein, we report the synthesis and n-channel transporting property of copolymers composed of diketopyrrolopyrrole unit and fluorinated phenyl unit, where the number of fluorine substitution varies. When the effect of the number of fluorine substitution on the n-channel transporting property is examined, it reveals that the polymer with four fluorine substitution exhibits the best n-type charge transporting behavior with an electron mobility of 1.71 cm2•V−1•s−1.