Highly Reproducible Interface Formation via a Phase-Switched Bulk Heterojunction for Organic Photodetectors
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초록
내용
In this study, a phase-switching process is introduced to a PM6:Y6-based active layer to implement a uniform surface with preferred Y6 acceptor-domain positioning. By designing the wetting coefficient-based process to fit the surface properties of a small-molecule Y6 acceptor-based bulk heterojunction, a highly reproducible phase-switched active layer was successfully formed over an area of 2.25 cm2. It improved charge transport ability and suppressed surface defects owing to a molecular orientation favorable for efficient charge separation and transport. Furthermore, an enhanced electron injection barrier formed according to the molecular orientation of this process suppresses the dark current density and improves detectivity. Therefore, the phase-switching process is an essential technology for forming high-quality thin films composed of small-molecule acceptors for efficient organic photodetector and photovoltaic applications.