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

대한화학회 제121회 학술발표회 및 총회 Mechanism of Molecular Rectification in Tunnel Junctions of 2,2’-Bipyridyl Terminated n-Alkanethiolate

등록일
2018년 2월 3일 14시 41분 49초
접수번호
3601
발표코드
INOR.P-51 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
4월 19일 (목요일) 11:00~12:30
발표형식
포스터
발표분야
Inorganic Chemistry
저자 및
공동저자
Sohyun Park, Seo Eun Byeon, SOOJIN CHO, Gyudon Kong, Hyo Jae Yoon*
Department of Chemistry, Korea University, Korea
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.

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