Publication date: 11th July 2022
Vinylene/olefin-linked two-dimensional covalent organic frameworks (v-2D-COFs) synthesized via reticular chemistry are featured with high chemical stability, excellent in-plane conjugated networks, and modulated optoelectronic properties. In particular, V-2D-COFs provide a platform to develop advanced semiconducting materials with high charge carrier mobilities which is however rarely reported so far. Herein, we demonstrate the synthesis of the first thiophene-rich V-2D-COF (named as V-2D-COF-T1) from a novel 4,8-di-2-thienylbenzo[1,2-b:4,5-b’]dithiophene based building block (FTTC) which is covalently connected by a bithiophene-based linker (ThDAN). Interestingly, the bithiophene-linked V-2D-COF exhibit a narrow energy band gap of ~1.13 eV, which is much narrower than those of corresponding linear thiophane-rich polymer (LTP, 1.48 eV) and biphenyl-linked V-2D-COF-T2 (1.73 eV). Moreover, ultrafast terahertz photoconductivity measurements indicate that the V-2D-COF-T1 has a high charge-carrier mobility up to ~21.39 cm2 V−1 s−1. This work provides the insights to design and synthesis of thiophene-rich 2D semiconducting polymers with high charge-carrier mobilities.
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