Active Film Thickness Control to Improve NO₂ Sensing Performance Using Polymers Based on Indolocarbazoles (ICZs)

다국어 초록 (Multilingual Abstract)

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 NO₂ 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.