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제125회 대한화학회 학술발표회 및 총회 Study of Power Factor in One Molecule-thick Films

2020년 2월 3일 13시 20분 45초
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Material Chemistry
저자 및
Sohyun Park, Minsang Cho, Hyo Jae Yoon*
Department of Chemistry, Korea University, Korea
There is a rapidly increasing interest in organic thin film thermoelectrics. However, the power factor (PF)—a measure of how much electricity a material can generate at once at a given temperature—of one molecule-thick organic film, self-assembled monolayer (SAM), has not yet been determined. This presentation shows a study that experimentally determines PF of one molecule-thick organic films, SAMs. The SAMs composed of n-alkanethiolates, n-cycloalkanethiolates and oligophenylenethiolates of different lengths are focused. These SAMs are electrically and thermoelectrically characterized on an identical junction platform using a liquid metal top-electrode, allowing the straightforward estimation of the PF of monolayers. A parametric semi-empirical model describing the length dependence of PF is further developed. Our simulation using this equation proposes that ultrathin organic films (e.g., less than 10 nm) can yield PF values that rival conventional high-performance organic materials. Furthermore, how the transition of transport regime from tunneling to hopping as molecules become long affect power factors is examined. We envisage that this work offers an unprecedented opportunity to harness SAM-based junctions as a nanoscale platform for establishing structure-PF relationships at the molecular level.