Synthetic Tailoring of Solid-State Order in Diketopyrrolopyrrole-Based Copolymers via Intramolecular Noncovalent Interactions

• DOI: 10.1021/cm503864u
• Publication Date: 2015-01-16T05:10:04Z
• Authors: Heung Gyu Kim; Boseok Kang; Hyomin Ko; Jaewon Lee; Jisoo Shin; Kilwon Cho
• Keywords: Non-covalent interactions; Thermal Stability; Surface Modification; Fluorine

Understanding the microstructures of semiconducting polymers is critical for improving charge transport properties polymer field-effect transistors (PFETs). A series diketopyrrolopyrrole-based copolymers designed by implementing concept intramolecular noncovalent conformational locks through functionalization backbones with fluorine atoms or methoxy groups were synthesized and compared their unfunctionalized analogue. In contrast to bimodal texture polymer, thin films exhibit predominantly edge-on much improved crystalline ordering. The modified have a principally face-on texture. These dramatic differences in thin-film can be correlated polymers' solubilities. Furthermore, ordering these semiconductor enables fabrication high-performance PFETs: hole mobility methoxy-modified reduced half respect that unmodified whereas values fluorine-modified are up ∼6 times higher, approximately 1.32 cm2 V–1 s–1, pronounced thermal stability. results provide new guidelines molecular design locks.