“…4,5 In most polymers, the presence of both donor and acceptor functionalities result in charge-transfer complexation with a concurrent decrease in the mobility. Perhaps for these reasons, few examples of bipolar transport have been reported in the literature.6,7 Nevertheless, it was suggested that charge carrier transport in APIs is deÐned not only by the presence of both electron donor and electron acceptor units in the polymer chains, but by peculiarities of the chemical structure and also the APIs solid state structure.…”