Highly Miscible All-Polymer Photodetectors with Green Selectivity and Detectivity
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초록
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All polymer photodetectors (PPD) have the unique advantages such as strong absorption co-efficient, easy color tunability, solution processability, and strong mechanical properties com-pared to organic photodetectors using fullerene derivative acceptors. In most cases of PPDs, dark current (Jd) and responsivity (R) are in trade-off relationship. In this study, we enhanced photodetecting properties while lowering Jd using asymmetric non-fullerene acceptor (NFA). In addition, green-light (G) selectivity was also achieved by making both polymer donor and acceptor having similar G absorption area. The combination of donor and NFA with similar surface free energy levels resulted in a homogeneous and well-mixed morphology of the pho-toconductive layer, enhancing the photodetecting performances in PPDs.