Introduction of Size-Controlled Bulk-Heterojunction Nanoparticles for Organic Photodetectors
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Bulk-heterojunction systems, which are based on donor and acceptor, have been studied as active layer of organic electronic devices owing to their advantages. Recently, to further develop them, various research on bulk-heterojunction nanoparticles(BHJ NPs)-based electronic devices have attracted attention. BHJ-NPs exhibit novel properties at the nanoscale arising from their high surface area-to-volume ratio, providing potential as new organic electronic materials. Herein, we synthesize size-controlled PM6:Y6-based BHJ NPs for organic photodetector and explore their size-dependent properties. Small-sized nanoparticles are expected to have more dense packing and fill the voids which is favorable for charge transport. On the other hand, large-sized nanoparticles close to incident light wavelength can be predicted to enhance light absorption due to the light scattering effect. Optimizing the size of BHJ NPs may improve both optical and electrical properties, providing a new strategy for nanoparticle-based organic photodetectors.