Diketopyrrolopyrrole-based two-dimensional poly(arylene vinylene)s with high charge carrier mobility.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 41634010.
- Also identified by DOI 10.1038/s41467-026-69061-4 and PMC identifier 12873148.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
Layered two-dimensional conjugated polymers (2D CPs), or 2D conjugated covalent organic frameworks, are promising semiconductor materials for (opto)electronics and photocatalysis, but their performance is often limited by insufficient in-plane conjugation and poor charge transport. Guided by density functional theory calculations, we report two donor-acceptor-type 2D poly(arylene vinylene)s constructed from thienyl-benzodithiophene and diketopyrrolopyrrole units. These materials are predicted to exhibit strongly dispersive energy bands with ultralow in-plane effective masses (0.036 - 0.159 m<sub>0</sub>), enabling intrinsic charge mobilities approaching 2000 cm<sup>2 </sup>V<sup>-1</sup> s<sup>-1</sup>. Solid-state Aldol-type 2D polycondensation yields crystalline materials with optical band gaps as narrow as 1.0 eV. Terahertz spectroscopy reveals long charge carrier scattering times of 76 fs and a high room-temperature mobility of 310 cm<sup>2 </sup>V<sup>-1</sup> s<sup>-1</sup>, surpassing previously reported linear and 2D CP powder samples. This work highlights donor-acceptor engineering as an effective strategy to enhance charge transport in 2D CPs.