Organic phototransistors with gate-sensing layers of conjugated polymer for the detection of confined deep red light
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Organic phototransistors have received considerable attention because of their potential for next-generation photosensor modules with ultrathin, transparent, flexible, and rollable characteristics. To date, conjugated polymers have been extensively studied for the channel layers in organic phototransistors due to their delocalized pi-orbital structures delivering both charge transport and light absorption. Recently, deep red light has become a keen focus for advanced applications including skin therapeutic devices. However, the absorption of deep red light could not be easily covered by typical conjugated polymers, even though a couple of conjugated polymers with a donor-acceptor structure showed an encouraging absorption up to a near infrared range. This presentation demonstrates synthesis of a deep red light-absorbing conjugated polymer and its application to organic phototransistors for confined deep red light detection.