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- Title
Energy-Level Alignment for Single-Molecule Conductance of Extended Metal-Atom Chains.
- Authors
Ta-Cheng Ting; Liang-Yan Hsu; Min-Jie Huang; Er-Chien Horng; Hao-Cheng Lu; Chan-Hsiang Hsu; Ching-Hong Jiang; Bih-Yaw Jin; Shie-Ming Peng; Chun-hsien Chen
- Abstract
The use of single-molecule junctions for various functions constitutes a central goal of molecular electronics. The functional features and the efficiency of electron transport are dictated by the degree of energy-level alignment (ELA), that is, the offset potential between the electrode Fermi level and the frontier molecular orbitals. Examples manifesting ELA are rare owing to experimental challenges and the large energy barriers of typical model compounds. In this work, single-molecule junctions of organometallic compounds with five metal centers joined in a collinear fashion were analyzed. The single-molecule i–V scans could be conducted in a reliable manner, and the EFMO levels were electrochemically accessible. When the electrode Fermi level (EF) is close to the frontier orbitals ( EFMO) of the bridging molecule, larger conductance was observed. The smaller |EF− EFMO| gap was also derived quantitatively, unambiguously confirming the ELA. The mechanism is described in terms of a two-level model involving co-tunneling and sequential tunneling processes.
- Subjects
MOLECULAR electronics; ORGANOMETALLIC compounds; ELECTRON transport; FRONTIER orbitals; FERMI level; ELECTRIC conductivity
- Publication
Angewandte Chemie, 2015, Vol 127, Issue 52, p15960
- ISSN
0044-8249
- Publication type
Article
- DOI
10.1002/ange.201508199