Development of enhanced organic photodetectors by investigating the origin of dark current density and synthesizing photoconductive polymers
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초록
내용
Three different benzo[1,2-d:4,5-d']bis(oxazole)bis(oxazole)-based conductive polymers PBB, PTB, and POTB were synthesized to improve the performance of p-n bulk heterojunction photodetectors (PDs). The π-spacer of the polymers were modified to achieve low dark current densities (Jd) in the PDs. Among them, the device based on the POTB polymer donor exhibited promising performance, with a responsivity (R) of 0.43 A/W and specific detectivity (D*) of 6.85×1012 Jones at -1 V under an LED at 532 nm. Furthermore, by measuring the energy of the hole charge-transfer (CT) state, it was found that the degree of hole accumulation in the CT state is more important than the CT state energy for maintaining a low Jd.