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Interplay of Fermi Level Pinning, Marcus Inverted Transport, and Orbital Gating in Molecular Tunneling Junctions

Authors
Kang, HunguKong, Gyu DonByeon, Seo EunYang, SenaKim, Jeong WonYoon, Hyo Jae
Issue Date
15-10월-2020
Publisher
AMER CHEMICAL SOC
Citation
JOURNAL OF PHYSICAL CHEMISTRY LETTERS, v.11, no.20, pp.8597 - 8603
Indexed
SCIE
SCOPUS
Journal Title
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume
11
Number
20
Start Page
8597
End Page
8603
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/52443
DOI
10.1021/acs.jpclett.0c02509
ISSN
1948-7185
Abstract
This Letter examines the interplay of important tunneling mechanisms-Fermi level pinning, Marcus inverted transport, and orbital gating-in a molecular rectifier. The temperature dependence of the rectifying molecular junction containing 2,2'-bipyridyl terminated n-alkanethiolate was investigated. A bell-shaped trend of activation energy as a function of applied bias evidenced the dominant occurrence of unusual Marcus inverted transport, while retention of rectification at low temperatures implied that the rectification obeyed the resonant tunneling regime. The results allowed reconciling two separately developed transport models, Marcus-Landauer energetics and Fermi level pinning-based rectification. Our work shows that the internal orbital gating can be substituted with the pinning effect, which pushes the transport mechanism into the Marcus inverted regime.
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