Chem
ArticleSolution-Processable, Crystalline π-Conjugated Two-Dimensional Polymers with High Charge Carrier Mobility
The Bigger Picture
Polymers with high charge carrier mobilities are important for the advancement of organic semiconductor devices. Ultrathin π-conjugated two-dimensional polymers (C2Ps) have been long envisaged to exhibit superior charge transport properties compared with those of small molecules and one-dimensional polymers. The major challenges are accessing C2Ps in their defect-free forms and ensuring their solution processability, which must be overcome to utilize them in any thin film electronic devices. Here, we present a bottom-up approach to synthesize high-quality, ultrathin, and solution-processable C2Ps based on a rational design of building blocks and careful optimization of reaction conditions. The solution-processed thin films exhibit high hole mobilities and allow broadband photodetection with impressive photoresponsivities. Overall, the findings provide design guidelines to approach the solution synthesis of C2Ps and offer new opportunities to explore their untapped potential.