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Switchable Junction Organic Photodiode based on Light-Intensity-Dependent Molecular Switch
강민균,Syed Zahid Hassan,고성민,최창원,Santosh Kumar Reddy Parumala,장윤희,윤진환,지동우,정대성 한국고분자학회 2021 한국고분자학회 학술대회 연구논문 초록집 Vol.46 No.2
A strategy to artificially widen linear dynamic range (LDR) of organic photodiode (OPD) by introducing a light-intensity-dependent transition of its operation mode, such that low saturation photocurrent can be overcome, is proposed. The active layer of OPD is doped with a strategically designed and synthesized molecular switch (1,2-bis-[2-methyl-5-(4-cyanobiphenyl)-3-thienyl]tetrafluorobenzene; DAB) and the resulting OPD shows typical OPD performances with an external quantum efficiency (EQE) < 100% under low-intensity light illumination but shows photomultiplication behaviors with an EQE > 100% under high-enough-intensity light illumination, resulting in artificially extended LDR up to 225 dB. Such a unique and reversible transition of operation mode by light intensity self-recognition of molecular-switch-embedded OPD can be explained by unbalanced quantum yield of photocyclization/photocycloreversion of molecular switch.