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Investigation of Dark Current Depending on Electron Acceptors for Efficient Organic Photodetector
장웅식,조재상,왕동환 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
Organic photodetectors have attracted interest owing to tunable optical properties, lightweight components, and cost-effective fabrication process. Since the organic semiconductors show excellent mechanical properties, flexible and curved design of photodetector is realized. For high performance photodetector, the dark current minimization is required, in addition to enhancing photocurrent, which affects figure-of-merits (the specific detectivity and the signal-to-noise ratio) Herein, we investigate a dark current characteristic depending on electron acceptor materials. Since the dark current calculated by traditional diode equation is significantly lower than the experimental dark current, we predicted that the dark current would be affected by factors other than heat-activated electrons. Moreover, we observed energy levels of each material related with charge injection.
장웅식,김병기,김민수,전일,왕동환 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.1
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 × 10<sup>14</sup> 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.