Abstract
Six phenyl-flanked benzodipyrrolidone-based copolymers are designed, synthesised and characterised. Three exhibit backbone in-plane curvature or out-of-plane twisting, while the other three remain planar and co-linear. While the first three appear less crystalline by X-ray diffraction, they afford a smoother solid-state film surface topology and increased electron mobility in top-gate, bottom-contact OFETs.
Highlights
Benzodipyrrolidones are promising building blocks for organic semiconductor materials, in part due to their innate stability and deep colour which lead to their early use as dye pigments.[1]
A number of copolymers based on phenyl- anked benzodipyrrolidone (BPP)[21,22,23,24,25] and its analogues[26,27] have been prepared, with charge carrier mobilities as high as 0.1 cm[2] VÀ1 sÀ1 under optimal processing conditions.[28]
We demonstrate that charge carrier mobility correlates to lm roughness, itself being related to the conjugated polymer backbone conformation and molecular architecture
Summary
Benzodipyrrolidones are promising building blocks for organic semiconductor materials, in part due to their innate stability and deep colour which lead to their early use as dye pigments.[1]. A number of copolymers based on phenyl- anked benzodipyrrolidone (BPP)[21,22,23,24,25] and its analogues[26,27] have been prepared, with charge carrier mobilities as high as 0.1 cm[2] VÀ1 sÀ1 under optimal processing conditions.[28] With appropriate copolymers, improved solid-state morphologies and high ionisation potentials may be realised, which can confer innate stability to electronic devices, with increased and preferential electron mobility Such molecular design plays an important role in governing self-assembly in the solid-state, with resultant texture directly affecting OFET performance.[29]. We demonstrate that charge carrier mobility correlates to lm roughness, itself being related to the conjugated polymer backbone conformation and molecular architecture
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