Effect of fluorination on morphological, electrical, and mechanical properties of benzotriazole-based polymer semiconductors
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초록
내용
The clear understanding of structure–property relationship of intrinsically stretchable polymer semiconductors is important for developing high-performance polymer-based stretchable electronics. Here, we investigate the effect of fluorination on crystallographic parameters, charge carrier mobility, and stretchability of benzodithiophene–co–benzotriazole (BDT–BTA) polymer semiconductors. By employing fluorine atoms in the BDT and/or BTA moieties, we demonstrate that polymer semiconductor thin films with non-fluorinated BTA show enhanced stretchability compared to those with the fluorinated BTA. We attribute the enhanced stretchability to the relatively higher π–π stacking distance of polymer chains and associated increase in free volume of the thin films. Considering negligible difference in charge carrier mobility of polymer semiconductors used in this study, our results provide insight into how crystalline structure of polymer semiconductors can affect their thin film stretchability.