Filled and empty states of alkanethiol monolayer on Au (1 1 1): Fermi level asymmetry and implications for electron transport

Yabing Qi; Omer Yaffe; Einat Tirosh; Ayelet Vilan; David Cahen; Antoine Kahn

doi:10.1016/j.cplett.2011.06.050

Filled and empty states of alkanethiol monolayer on Au (1 1 1): Fermi level asymmetry and implications for electron transport

Yabing Qi, Omer Yaffe, Einat Tirosh, Ayelet Vilan, David Cahen, Antoine Kahn

Research output: Contribution to journal › Article › peer-review

41 Scopus citations

Abstract

The electronic structure of the prototypical self-assembled monolayer (SAM) system, i.e. alkanethiol molecules on Au, is investigated via ultraviolet and inverse photoemission spectroscopy measurements. The determination of the density of filled and empty states of the system reveals that the metal Fermi level is significantly closer to the lowest unoccupied molecular orbital (LUMO) of the molecules than to their highest occupied molecular orbital (HOMO). The results suggest that charge carrier tunneling is controlled by the LUMO, rather than by the HOMO, in contrast to what is commonly assumed.

Original language	English (US)
Pages (from-to)	344-347
Number of pages	4
Journal	Chemical Physics Letters
Volume	511
Issue number	4-6
DOIs	https://doi.org/10.1016/j.cplett.2011.06.050
State	Published - Aug 5 2011

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)
Physical and Theoretical Chemistry

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title = "Filled and empty states of alkanethiol monolayer on Au (1 1 1): Fermi level asymmetry and implications for electron transport",

abstract = "The electronic structure of the prototypical self-assembled monolayer (SAM) system, i.e. alkanethiol molecules on Au, is investigated via ultraviolet and inverse photoemission spectroscopy measurements. The determination of the density of filled and empty states of the system reveals that the metal Fermi level is significantly closer to the lowest unoccupied molecular orbital (LUMO) of the molecules than to their highest occupied molecular orbital (HOMO). The results suggest that charge carrier tunneling is controlled by the LUMO, rather than by the HOMO, in contrast to what is commonly assumed.",

author = "Yabing Qi and Omer Yaffe and Einat Tirosh and Ayelet Vilan and David Cahen and Antoine Kahn",

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T1 - Filled and empty states of alkanethiol monolayer on Au (1 1 1)

T2 - Fermi level asymmetry and implications for electron transport

AU - Qi, Yabing

AU - Yaffe, Omer

AU - Tirosh, Einat

AU - Vilan, Ayelet

AU - Cahen, David

AU - Kahn, Antoine

PY - 2011/8/5

Y1 - 2011/8/5

N2 - The electronic structure of the prototypical self-assembled monolayer (SAM) system, i.e. alkanethiol molecules on Au, is investigated via ultraviolet and inverse photoemission spectroscopy measurements. The determination of the density of filled and empty states of the system reveals that the metal Fermi level is significantly closer to the lowest unoccupied molecular orbital (LUMO) of the molecules than to their highest occupied molecular orbital (HOMO). The results suggest that charge carrier tunneling is controlled by the LUMO, rather than by the HOMO, in contrast to what is commonly assumed.

AB - The electronic structure of the prototypical self-assembled monolayer (SAM) system, i.e. alkanethiol molecules on Au, is investigated via ultraviolet and inverse photoemission spectroscopy measurements. The determination of the density of filled and empty states of the system reveals that the metal Fermi level is significantly closer to the lowest unoccupied molecular orbital (LUMO) of the molecules than to their highest occupied molecular orbital (HOMO). The results suggest that charge carrier tunneling is controlled by the LUMO, rather than by the HOMO, in contrast to what is commonly assumed.

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