Abstract : INDF polymers exhibit highly balanced ambipolar characteristics with hole and electron mobilities up to 0.51 cm 2 V −1 s −1 and 0.50 cm 2 V −1 s −1, respectively. Abstract : Two donor–acceptor (D–A) conjugated polymers, PINDFTT and PINDFBT, based on a novel electron acceptor, (3 E, 8 E )-3, 8-bis(2-oxoindolin-3-ylidene)naphtho-[1, 2- b :5, 6- b ′]difuran-2, 7(3 H, 8 H )-dione (INDF), are synthesized for solution processed organic thin-film transistors. Both polymers exhibited highly balanced ambipolar characteristics with hole and electron mobilities up to 0.51 cm 2 V −1 s −1 and 0.50 cm 2 V −1 s −1, respectively.