High-detectivity organic photodetectors by development of novel conjugated polymers
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초록
내용
The p-n junction organic photodetectors (OPDs) have been actively studied to achieve high-resolution image sensors. In terms of development of organic materials, it is most important to realize the materials capable of generating a low dark current density (Jd) and high photo-induced current density (Jph) in the OPDs, which is crucial for high-detectivity and responsivity in OPDs. In this study, the conjugated polyelectrolytes and polymers were designed and synthesized to increase Jph as well as decrease Jd in the devices. The synthesized cathode buffer layer materials was coated on the electron transporting layer (ETL), which dramatically enhanced the photodiode properties via modifying the work function of the ETL and improving the surface contact properties between ETL and active layer. In case of active layer, the lamellar ordering of conjugated polymer was highly important to suppress Jd and increase Jph in the devices. The detailed discussion will be given in the presentation.