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한지민,권지언,이위형,김봉기 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
Gas sensor based on organic field-effect transistors (OFETs) was performed analyte detect by inducing current change which be caused by charge transfer between electron donating polymer and electron accepting NO<sub>2</sub> gas analyte. In this study, three designed conjugated polymers (CPs) containing ICZs derivative with different functional groups were utilized as active layer materials. Each CPs was exhibited different film crystallinity and reaction sites with analyte, influencing the diffusion pathway and polymer-analyte interaction, which in affect gas responsivity. Introduction of polar side chain was achieved high responsivity by enhanced analyte diffusion into conducting channel and charge transfer. OFET devices were fabricated by adjusting thickness of the active layer of CPs, respectively. Several studies have reported that reducing the active layer thickness have been made to improve the sensitivity, but our work showed the highest responsivity at optimized thickness for all three CPs.