Azulene is a promising candidate for constructing optoelectronic materials. An effective strategy is presented to obtain high-performance conjugated polymers by incorporating 2,6-connected azulene units into the polymeric backbone, and two conjugated copolymers P(TBAzDI-TPD) and P(TBAzDI-TFB) were designed and synthesized based on this strategy. They are the first two examples for 2,6-connected azulene-based conjugated polymers and exhibit unipolar n-type transistor performance with an electron mobility of up to 0.42 cm V s , which is among the highest values for n-type polymeric semiconductors in bottom-gate top-contact organic field-effect transistors. Preliminary all-polymer solar cell devices with P(TBAzDI-TPD) as the electron acceptor and PTB7-Th as the electron donor display a power conversion efficiency of 1.82 %.

This work introduces six novel naphthalene diimide (NDI) molecular acceptors for evaluation in organic solar cells based on two different chemical architectures: a star-shaped structure with a triarylamine core flanked by three NDI moieties and a linear molecule composed of a bithiophene bridge between two NDI moieties.

Azulene is ap romising candidate for constructing optoelectronic materials.A ne ffective strategy is presented to obtain high-performance conjugated polymers by incorporating 2,6-connected azulene units into the polymeric backbone, and two conjugated copolymers P(TBAzDI-TPD) and P(TBAzDI-TFB) were designed and synthesized based on this strategy.They are the first two examples for 2,6-connected azulene-based conjugated polymers and exhibit unipolar ntype transistor performance with an electron mobility of up to 0.42 cm 2 V À1 s À1 ,w hich is among the highest values for n-type polymeric semiconductors in bottom-gate top-contact organic field-effect transistors.P reliminary all-polymer solar cell devices with P(TBAzDI-TPD) as the electron acceptor and PTB7-Th as the electron donor displayapower conversion efficiency of 1.82 %.