Prevention of Electrode Degradation via pH-Controlled PEDOT:PSS for Enhanced Detectivity of Organic Photodiode
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초록
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This study improves the detectivity of organic photodetector (OPD) by modifying the pH of Poly(3,4-ethylenedioxythiophene):poly(styrenesulfonate) (PEDOT:PSS). PEDOT:PSS is widely used conducting polymer as hole transport layer (HTL) material due to its excellent electrical, mechanical properties, and solution processability. However, the efficiency and stability of the device may be limited due to the inherent acidity of the PEDOT:PSS. To solve this problem, an OPD device was manufactured by using imidazole, a mild organic base, as a dopant of PEDOT:PSS. It improves stability of device by controlling the acidity of PEDOT:PSS, and the deep HOMO of pH-controlled PEDOT:PSS can effectively prevent the injection of electrons through the anode. Thus, the OPD’s detectivity can be enhanced. In this analysis, electrical resistance and surface morphology investigations were also carried out via atomic force microscopy, space charge-limited current, photoluminescence, and impedance analyses.