Charge separation at the molecular monolayer surface

Observation and control of the dynamics

Masahiro Shibuta, Naoyuki Hirata, Ryo Matsui, Toyoaki Eguchi, Atsushi Nakajima

Research output: Contribution to journalArticle

18 Citations (Scopus)

Abstract

Charge separation dynamics relevant to an electron transfer have been revealed by time- and angle-resolved two-photon photoemission spectroscopy for an n-alkanethiolate self-assembled monolayer (SAM) on a Au(111) surface fabricated by a chemical-wet process. The electron was photoexcited into an image potential state located at 3.7 eV above the Fermi level (E F), and it survived well for more than 100 ps on dodecanethiolate (C12)-SAM. The degree of electron separation is precisely controlled by selecting the length of the alkyl chain (C10-C18). We have also evaluated molecular conductivity at the specific electron energy of E F + 3.7 eV. The tunneling decay parameter, β, was fitted by β 90 K = 0.097 Å -1 and β RT = 0.13 Å -1. These values were one order smaller than that at around E F by conventional contact probe methods.

Original languageEnglish
Pages (from-to)981-985
Number of pages5
JournalJournal of Physical Chemistry Letters
Volume3
Issue number8
DOIs
Publication statusPublished - 2012 Apr 19

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polarization (charge separation)
Monolayers
Electrons
Self assembled monolayers
electron transfer
electrons
photoelectric emission
electron energy
conductivity
photons
decay
Photoelectron spectroscopy
Fermi level
spectroscopy
Photons

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Charge separation at the molecular monolayer surface : Observation and control of the dynamics. / Shibuta, Masahiro; Hirata, Naoyuki; Matsui, Ryo; Eguchi, Toyoaki; Nakajima, Atsushi.

In: Journal of Physical Chemistry Letters, Vol. 3, No. 8, 19.04.2012, p. 981-985.

Research output: Contribution to journalArticle

Shibuta, Masahiro ; Hirata, Naoyuki ; Matsui, Ryo ; Eguchi, Toyoaki ; Nakajima, Atsushi. / Charge separation at the molecular monolayer surface : Observation and control of the dynamics. In: Journal of Physical Chemistry Letters. 2012 ; Vol. 3, No. 8. pp. 981-985.
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