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| Type |
Poster Presentation |
| Area |
Inorganic Chemistry |
| Room No. |
Event Hall |
| Time |
4월 19일 (목요일) 11:00~12:30 |
| Code |
INOR.P-203 |
| Subject |
Significant Rectification of Tunneling Currents Achieved by Pyrene-terminated n-Alkanethiolate |
| Authors |
SOOJIN CHO, Gyudon Kong, Sohyun Park, Seo Eun Byeon, Hyo Jae Yoon*
Department of Chemistry, Korea University, Korea
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| Abstract |
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. |
| E-mail |
tsch516@naver.com |
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121st General Meeting of the KCS