Probing interfacial characteristics of rubrene/pentacene and pentacene/rubrene bilayers with soft X-ray spectroscopy

J. H. Seo, T. M. Pedersen, G. S. Chang, A. Moewes, K. H. Yoo, S. J. Cho, C. N. Whang

Research output: Contribution to journalArticle

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Abstract

The electronic structure of rubrene/pentacene and pentacene/rubrene bilayers has been investigated using soft X-ray absorption spectroscopy, resonant X-ray emission spectroscopy, and density-functional theory calculations. X-ray absorption and emission measurements reveal that it has been possible to alter the lowest unoccupied and the highest occupied molecular orbital states of rubrene in rubrene/pentacene bilayer. In the reverse case, one gets p* molecular orbital states originating from the pentacene layer. Resonant X-ray emission spectra suggest a reduction in the hole-transition probabilities for the pentacene/rubrene bilayer in comparison to reference pentacene layer. For the rubrenepentacene structure, the hole-transition probability shows an increase in comparison to the rubrene reference. We also determined the energy level alignment of the pentacene-rubrene interface by using X-ray and ultraviolet photoelectron spectroscopy. From these comparisons, it is found that the electronic structure of the pentacene-rubrene interface has a strong dependence on interface characteristics which depends on the order of the layers used.

Original languageEnglish
Pages (from-to)9513-9518
Number of pages6
JournalJournal of Physical Chemistry B
Volume111
Issue number32
DOIs
Publication statusPublished - 2007 Aug 16

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Molecular orbitals
X ray spectroscopy
Electronic structure
Ultraviolet photoelectron spectroscopy
X ray absorption spectroscopy
X ray absorption
Electron energy levels
spectroscopy
Density functional theory
x rays
X ray photoelectron spectroscopy
transition probabilities
molecular orbitals
X rays
electronic structure
ultraviolet spectroscopy
absorption spectroscopy
emission spectra
energy levels
alignment

All Science Journal Classification (ASJC) codes

  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films
  • Materials Chemistry

Cite this

Seo, J. H. ; Pedersen, T. M. ; Chang, G. S. ; Moewes, A. ; Yoo, K. H. ; Cho, S. J. ; Whang, C. N. / Probing interfacial characteristics of rubrene/pentacene and pentacene/rubrene bilayers with soft X-ray spectroscopy. In: Journal of Physical Chemistry B. 2007 ; Vol. 111, No. 32. pp. 9513-9518.
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Probing interfacial characteristics of rubrene/pentacene and pentacene/rubrene bilayers with soft X-ray spectroscopy. / Seo, J. H.; Pedersen, T. M.; Chang, G. S.; Moewes, A.; Yoo, K. H.; Cho, S. J.; Whang, C. N.

In: Journal of Physical Chemistry B, Vol. 111, No. 32, 16.08.2007, p. 9513-9518.

Research output: Contribution to journalArticle

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T1 - Probing interfacial characteristics of rubrene/pentacene and pentacene/rubrene bilayers with soft X-ray spectroscopy

AU - Seo, J. H.

AU - Pedersen, T. M.

AU - Chang, G. S.

AU - Moewes, A.

AU - Yoo, K. H.

AU - Cho, S. J.

AU - Whang, C. N.

PY - 2007/8/16

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N2 - The electronic structure of rubrene/pentacene and pentacene/rubrene bilayers has been investigated using soft X-ray absorption spectroscopy, resonant X-ray emission spectroscopy, and density-functional theory calculations. X-ray absorption and emission measurements reveal that it has been possible to alter the lowest unoccupied and the highest occupied molecular orbital states of rubrene in rubrene/pentacene bilayer. In the reverse case, one gets p* molecular orbital states originating from the pentacene layer. Resonant X-ray emission spectra suggest a reduction in the hole-transition probabilities for the pentacene/rubrene bilayer in comparison to reference pentacene layer. For the rubrenepentacene structure, the hole-transition probability shows an increase in comparison to the rubrene reference. We also determined the energy level alignment of the pentacene-rubrene interface by using X-ray and ultraviolet photoelectron spectroscopy. From these comparisons, it is found that the electronic structure of the pentacene-rubrene interface has a strong dependence on interface characteristics which depends on the order of the layers used.

AB - The electronic structure of rubrene/pentacene and pentacene/rubrene bilayers has been investigated using soft X-ray absorption spectroscopy, resonant X-ray emission spectroscopy, and density-functional theory calculations. X-ray absorption and emission measurements reveal that it has been possible to alter the lowest unoccupied and the highest occupied molecular orbital states of rubrene in rubrene/pentacene bilayer. In the reverse case, one gets p* molecular orbital states originating from the pentacene layer. Resonant X-ray emission spectra suggest a reduction in the hole-transition probabilities for the pentacene/rubrene bilayer in comparison to reference pentacene layer. For the rubrenepentacene structure, the hole-transition probability shows an increase in comparison to the rubrene reference. We also determined the energy level alignment of the pentacene-rubrene interface by using X-ray and ultraviolet photoelectron spectroscopy. From these comparisons, it is found that the electronic structure of the pentacene-rubrene interface has a strong dependence on interface characteristics which depends on the order of the layers used.

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