Organic phototransistors (OPTs) are promising flexible photodetectors, but it is challenging to achieve high photosensitivity due to their intrinsic on-state current regardless of lighting conditions. In this study, photomultiplication-type organic phototransistors (PM-OPTs) are developed to suppress a dark current while producing a large photocurrent. A thin blocking layer is inserted between the source/drain electrodes and the active layer to induce a photomultiplication effect. The proposed PM-OPTs show two orders of magnitude larger photosensitivity whereas 100 times less power consumption in dark compared to conventional OPTs. We believe the proposed devices are suitable for realizing accurate and energy-efficient wearable bio-signal sensors.
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