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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-51 |
| Subject |
Mechanism of Molecular Rectification in Tunnel Junctions of 2,2’-Bipyridyl Terminated n-Alkanethiolate |
| Authors |
Sohyun Park, Seo Eun Byeon, SOOJIN CHO, Gyudon Kong, Hyo Jae Yoon*
Department of Chemistry, Korea University, Korea
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| Abstract |
This presentation describes physical-organic study for achieving fundamental understanding of mechanism of rectification across SAM-based large-area tunnel junctions with the structure, AgTS/SC11BIPY//Ga2O3/EGaIn (BIPY: 2,2’-bipyridyl). Junction measurements at low temperatures led us to eliminate the possibility that the mechanism of rectification resembles that of similar junction, AgTS/SC11Fc//Ga2O3/EGaIn (Fc: ferroceneyl): the rectification of SC11BIPY depends on pure quantum tunneling, not thermally activated hopping. Given the Araidai’s molecule-electrode coupling model to describe resonant tunneling, further study with Fowler-Nordheim analysis suggested that the ~102 rectification ratio in the BIPY-terminated SAM stems from asymmetrically occurring resonant tunneling for +V and -V, facilitated by asymmetrically broadened LUMO of BIPY relative to the Fermi level of Ga2O3/EGaIn top-electrode. This conclusion was supported by the experiment that replacing n-type BIPY terminal group with another π-rich p-type one, pyrenyl (PYR), led to rectification with similar magnitude and reverse direction. |
| E-mail |
psh9491@naver.com |
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121st General Meeting of the KCS