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Title: Site-specific intermolecular valence-band dispersion in α-phase crystalline films of cobalt phthalocyanine studied by angle-resolved photoemission spectroscopy

Abstract

The valence band structure of α-phase crystalline films of cobalt phthalocyanine (CoPc) grown on Au(111) is investigated by using angle-resolved photoemission spectroscopy (ARPES) with synchrotron radiation. The photo-induced change in the ARPES peaks is noticed in shape and energy of the highest occupied molecular orbital (HOMO, C 2p) and HOMO-1 (Co 3d) of CoPc, and is misleading the interpretation of the electronic properties of CoPc films. From the damage-free normal-emission ARPES measurement, the clear valence-band dispersion has been first observed, showing that orbital-specific behaviors are attributable to the interplay of the intermolecular π-π and π-d interactions. The HOMO band dispersion of 0.1 eV gives the lower limit of the hole mobility for α-CoPc of 28.9 cm{sup 2} V{sup −1} s{sup −1} at 15 K. The non-dispersive character of the split HOMO-1 bands indicates that the localization of the spin state is a possible origin of the antiferromagnetism.

Authors:
;  [1]
  1. Institute for Molecular Science (IMS), Okazaki 444-8585 (Japan)
Publication Date:
OSTI Identifier:
22413309
Resource Type:
Journal Article
Journal Name:
Journal of Chemical Physics
Additional Journal Information:
Journal Volume: 141; Journal Issue: 22; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0021-9606
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANTIFERROMAGNETISM; COBALT COMPLEXES; DISPERSIONS; EMISSION; FILMS; INTERACTIONS; MOLECULAR ORBITAL METHOD; PEAKS; PHOTOELECTRON SPECTROSCOPY; SPIN; SYNCHROTRON RADIATION

Citation Formats

Yamane, Hiroyuki, Kosugi, Nobuhiro, and The Graduate University for Advanced Studies, Okazaki 444-8585. Site-specific intermolecular valence-band dispersion in α-phase crystalline films of cobalt phthalocyanine studied by angle-resolved photoemission spectroscopy. United States: N. p., 2014. Web. doi:10.1063/1.4902912.
Yamane, Hiroyuki, Kosugi, Nobuhiro, & The Graduate University for Advanced Studies, Okazaki 444-8585. Site-specific intermolecular valence-band dispersion in α-phase crystalline films of cobalt phthalocyanine studied by angle-resolved photoemission spectroscopy. United States. doi:10.1063/1.4902912.
Yamane, Hiroyuki, Kosugi, Nobuhiro, and The Graduate University for Advanced Studies, Okazaki 444-8585. Sun . "Site-specific intermolecular valence-band dispersion in α-phase crystalline films of cobalt phthalocyanine studied by angle-resolved photoemission spectroscopy". United States. doi:10.1063/1.4902912.
@article{osti_22413309,
title = {Site-specific intermolecular valence-band dispersion in α-phase crystalline films of cobalt phthalocyanine studied by angle-resolved photoemission spectroscopy},
author = {Yamane, Hiroyuki and Kosugi, Nobuhiro and The Graduate University for Advanced Studies, Okazaki 444-8585},
abstractNote = {The valence band structure of α-phase crystalline films of cobalt phthalocyanine (CoPc) grown on Au(111) is investigated by using angle-resolved photoemission spectroscopy (ARPES) with synchrotron radiation. The photo-induced change in the ARPES peaks is noticed in shape and energy of the highest occupied molecular orbital (HOMO, C 2p) and HOMO-1 (Co 3d) of CoPc, and is misleading the interpretation of the electronic properties of CoPc films. From the damage-free normal-emission ARPES measurement, the clear valence-band dispersion has been first observed, showing that orbital-specific behaviors are attributable to the interplay of the intermolecular π-π and π-d interactions. The HOMO band dispersion of 0.1 eV gives the lower limit of the hole mobility for α-CoPc of 28.9 cm{sup 2} V{sup −1} s{sup −1} at 15 K. The non-dispersive character of the split HOMO-1 bands indicates that the localization of the spin state is a possible origin of the antiferromagnetism.},
doi = {10.1063/1.4902912},
journal = {Journal of Chemical Physics},
issn = {0021-9606},
number = 22,
volume = 141,
place = {United States},
year = {2014},
month = {12}
}