Published in:Angewandte Chemie International Edition
Language:
English
DOI:
10.1002/anie.202305978
ISSN:
1433-7851;
1521-3773
Origination:
Footnote:
Description:
<jats:title>Abstract</jats:title><jats:p>Linear conjugated polymers have attracted significant attention in organic electronics in recent decades. However, despite intrachain π‐delocalization, interchain hopping is their transport bottleneck. In contrast, two‐dimensional (2D) conjugated polymers, as represented by 2D π‐conjugated covalent organic frameworks (2D <jats:italic>c</jats:italic>‐COFs), can provide multiple conjugated strands to enhance the delocalization of charge carriers in space. Herein, we demonstrate the first example of thiophene‐based 2D poly(arylene vinylene)s (PAVs, <jats:bold>2DPAV‐BDT‐BT</jats:bold> and <jats:bold>2DPAV‐BDT‐BP</jats:bold>, BDT=benzodithiophene, BT=bithiophene, BP=biphenyl) via Knoevenagel polycondensation. Compared with <jats:bold>2DPAV‐BDT‐BP</jats:bold>, the fully thiophene‐based <jats:bold>2DPAV</jats:bold>‐<jats:bold>BDT</jats:bold>‐<jats:bold>BT</jats:bold> exhibits enhanced planarity and π‐delocalization with a small band gap (1.62 eV) and large electronic band dispersion, as revealed by the optical absorption and density functional calculations. Remarkably, temperature‐dependent terahertz spectroscopy discloses a unique band‐like transport and outstanding room‐temperature charge mobility for <jats:bold>2DPAV‐BDT‐BT</jats:bold> (65 cm<jats:sup>2</jats:sup> V<jats:sup>−1</jats:sup> s<jats:sup>−1</jats:sup>), which far exceeds that of the linear PAVs, <jats:bold>2DPAV‐BDT‐BP</jats:bold>, and the reported 2D <jats:italic>c</jats:italic>‐COFs in the powder form. This work highlights the great potential of thiophene‐based 2D PAVs as candidates for high‐performance opto‐electronics.</jats:p>