수중 가시광 통신을 위한 고 응답성 유기 광 트랜지스터

Abstract

The technology of underwater communications can greatly enhance human’s ability to study, monitor, and explore the ocean, as well as to realize smart aqua farm, defense systems, and underwater drone. Among underwater communication technology, underwater optical communi cation has the advantage of being able to communicate faster than RF communication or acoustic communication. To send data at a speedier rate, high performance photodetectors are required in receiver model. In addition, photodetector should exhibit high photo-responsivity with blue/cyan-blue light irradiation. In this study, we fabricated High performance organic phototransistors (OPTs) based on N-type non-fullerene small molecule acceptor IT-4F and P-type polymer donor PTO2. Bulk-heterojunction IT-4F:PTO2 has wide absorption spectrum in the range of 450nm-550nm wavelength. From the electrical characterization of the OPTs devices with BHJ photoactive layer, it showed high photo-responsivity>1A/W, large photo-sensitivity >103 even under very weak incident light. BHJ photoactive layer can absorb a wide spectrum of visible-light to produce exciton, and efficient dissociation of exciton occurs at the interface between donor and acceptor. The result of this study showed the possibility of being applied to various optical sensor such as low-cost image sensors and optical communication modules through various printing processes.