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

Princeton University
Weizmann Institute of Science

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

49 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
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 - 5 Aug 2011
Externally published	Yes

Funding

DC & AK gratefully acknowledge support from the US-Israel Binational Science Foundation. Work at Princeton was in part supported by the National Science Foundation ( DMR-1005892 ) and the Princeton MRSEC of the National Science Foundation ( DMR-0819860 ). Work at the Weizmann received also partial support from the Israel Science Foundation, via a Centre of excellence and its NAno-ERA+ program. OY thanks the Azrieli foundation for a fellowship. DC. Holds the Schaefer chair in Energy research.

Funders	Funder number
National Science Foundation	DMR-1005892
Materials Research Science and Engineering Center, Harvard University	DMR-0819860
United States-Israel Binational Science Foundation
Israel Science Foundation
Azrieli Foundation

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10.1016/j.cplett.2011.06.050

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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.",

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AU - Yaffe, Omer

AU - Tirosh, Einat

AU - Vilan, Ayelet

AU - Cahen, David

AU - Kahn, Antoine

PY - 2011/8/5

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

Abstract

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