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  • 02월 19일 10시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

제121회 대한화학회 학술발표회, 총회 및 기기전시회 안내 Significant Rectification of Tunneling Currents Achieved by Pyrene-terminated n-Alkanethiolate

2018년 2월 13일 11시 33분 53초
INOR.P-203 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
4월 19일 (목요일) 11:00~12:30
Inorganic Chemistry
저자 및
SOOJIN CHO, Gyudon Kong, Sohyun Park, Seo Eun Byeon, Hyo Jae Yoon*
Department of Chemistry, Korea University, Korea
Fundamental understanding on how rates of charge tunneling across molecules are related to the chemical and electronic structures of them is important for study of organic and molecular electronics. In this work, we show structurally simple, new organic rectifier of n-alkanethiolate terminated with polycyclic aromatic hydrocarbon (PAH) moiety, pyrenyl. Large-area tunnel junction of self-assembled monolayer (SAM) comprising this molecule exhibits high rectification ratio (~148 ± 2) with a negative polarity (J(-V) >> J(+V)). To elucidate the basis of the rectification, several physical organic studies are conducted. Some of them include the structural change of PAH terminal group from pyrenyl to naphtharenyl, anthracenyl, phenanthrenyl while retaining other junction components identical, junction measurements at variable temperatures and with different top-electrodes (eutectic gallium-indium alloy vs. gold), and the characterization of SAMs with ultraviolet photoelectron spectroscopy (UPS). Our results indicate that the rectification is associated with HOMO energy level of PAH, relies on pure tunneling (not thermally activated hopping process), and can be explained by asymmetrically occurring resonant tunneling at +V and –V based on the Araidai’s molecule-electrode coupling model.