期刊
NANO LETTERS
卷 16, 期 6, 页码 3949-3954出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.6b01592
关键词
single-molecule junctions; electronic transport; resonant transport; transmission function; electrochemical gating
类别
资金
- National Science Foundation [DMR-1507440]
- Office of Science, Office of Basic Energy Sciences, Materials Sciences and Engineering Division, of the U.S. Department of Energy [DE-AC02-05-CH11231]
- Molecular Foundry through U.S. Department of Energy, Office of Basic Energy Sciences [DEAC02- 05CH11231]
- Division Of Materials Research
- Direct For Mathematical & Physical Scien [1507440] Funding Source: National Science Foundation
Charge transport phenomena in single-molecule junctions are often dominated by tunneling, with a transmission function dictating the probability that electrons or holes tunnel through the junction. Here, we :present a new and simple technique for measuring, the transmission functions of molecular junctions in the coherent tunneling limit, over an energy range of 1.5 eV around the Fermi energy. We create molecular junctions in an ionic environment with electrodes having different exposed areas, which results in the formation of electric double layets of dissimilar density on the two electrodes: This allows us to electrostatically shift the molecular resonance relative to the junction Fermi levels in a manner that depends on the sign of the applied bias, enabling us to map, out the junction's transmission function and determine the dominant orbital for charge transport in the molecular junction. We demonstrate, this technique using two groups of molecules: one group having molecular resonance energies relatively far from 4 and one group having molecular resonance energies within the accessible bias window. Our results compare well with previous electrochemical gating data, and with transmission functions computed from first principles. Furthermore, with the second group of molecules, We are able to examine the behavior of a molecular junction as a resonance shifts into the bias window. This work provides a new, experimentally simple route for exploring the fundamentals of charge transport at the nanoscale.
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