Dark Current Reduction by Introducing Carbon Nanotube Transparent Electrode with Deep Work Function for Efficient Flexible Organic Photodetectors
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Carbon nanotubes(CNTs) have attracted huge attention owing to their outstanding flexibility, transparency, and conductivity, so that CNTs can replace an indium-tin oxide for efficient curved and flexible photodetectors. Especially, CNTs-based electrode with high chemical resistance is the excellent candidate for organic photodetectors (OPDs), because the devices have been fabricated through solution process. In addition, The OPDs require dense nanotubes arrays to form top layers suitably to enhance the performance. Herein, the CNT electrode with high transmittance reduced dark current below pA level and exhibited the higher detectivity of 2.07 × 1014 Jones than that of ITO-based devices. The deep work function of the CNT electrode formed high electron injection barrier observed via photoelectron yield spectroscopy. The flexible OPDs fabricated utilizing the CNT electrode stably operated after 500-bending tests.