Abstract
Abstract Solvent solvation properties are one of the most important key parameters governing the characteristics of polymer film formation during solution processing. Here, we systematically investigated the effects of a solvent's structural isomer on the microstructure evolution of a semiconducting polymer film during solution deposition. We found that spin-casting a conjugated polymer solution over a short period of only a few seconds improved the molecular ordering and charge transport characteristics of the resulting polymer thin films, depending on the isomeric structure of the solvent. Here, we elucidated the effects of the solvent's isomeric structure on the drying kinetics during spin-coating and systematically investigated the film structural development during solidification of the conjugated polymers. We finally evaluated the performances of the resulting polymer field-effect transistors. We demonstrated that controlling the spinning time improved the molecular ordering and electrical characteristics of the polymer thin films in a trend that was strongly correlated with the crystallization, which depended on the isomeric structure (dipole moment) of the solvent.
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