Semiconducting Polymers with Sulfur-Containing Heterocycles and Their Phototransistor Characteristics
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Conjugated polymers have been recognized as a fascinating semiconducting material for next-generation flexible and wearable devices thanks to their inherently soft and tough characteristics compared to inorganic materials. The core benefit of conjugated polymers includes low-temperature solution processes which can deliver continuous roll-to-roll fabrications based on large-area flexible film substrates. Recently, new category of conjugated polymers has been reported by employing heterocycles with extended conjugation lengths. These new types of conjugated polymers have been used for organic solar cells and could improve power conversion efficiency. However, less attention has been paid to their applications for organic phototransistors. In this work, we tried to synthesize four different conjugated polymers with sulfur-containing heterocycles (seven-membered etc.) and investigated their photoensing characteristics by fabricating organic phototransistors