Dark current reduction of Organic photodetector via introducing nonconjugated spacer into n-type polymers
발표자
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초록
내용
Due to morphological randomness nature of organic materials, which cause inefficient charge transport process, control of dark current density (Jd) is essentially necessary to achieve high performance organic photodetectors (OPDs). Herein, we synthesized four different n-type polymer acceptors with non-conjugated alkyl spacers. The PNE1 based OPD showed improved hole-blocking properties due to optimized morphology and insulating properties of alkyl spacers. As a results, the PNE1 based OPD exhibited a high specific detectivity (D*) of 1.81 × 1012 Jones, under 532 nm illumination, at 100 μW/cm2 and a bias of -2.0 V. Furthermore, PNE1 based OPD showed ultrafast response behavior with rising and falling times of 2 us and 9 us, respectively.