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Scanning tunneling microscopy study of thin PTCDI films on Ag/Si(111)-root 3 x root 3
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.ORCID iD: 0000-0003-4165-1515
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.ORCID iD: 0000-0002-1609-8909
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics.
2017 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 146, no 11, article id 114702Article in journal (Refereed) Published
Abstract [en]

3,4,9,10-perylene tetracarboxylic diimide molecules were evaporated onto a Ag/Si(111)-root 3 x root 3 surface and studied by scanning tunneling microscopy/spectroscopy and low energy electron diffraction (LEED). The growth mode was characterized as layer-by-layer growth with a single molecular unit cell in a short range order. The growth of the first two monolayers involves a molecule/substrate superstructure and a molecule/molecule superstructure. At higher coverages, the molecules in each layer were found to align so that unit cells are on top of each other. The experimentally obtained LEED pattern is described as a combination of patterns from the molecular unit cell and the molecule/substrate superstructure. The electronic structure was found to be strongly dependent on the film thickness for the first few layers: Several extra states are found at low coverages compared to higher coverages resulting in a very small pseudo gap of 0.9 eV for the first layer, which widens up to 4.0 eV for thicker films.

Place, publisher, year, edition, pages
AMER INST PHYSICS , 2017. Vol. 146, no 11, article id 114702
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Physical Sciences
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Physics
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URN: urn:nbn:se:kau:diva-65295DOI: 10.1063/1.4978470ISI: 000397313600027PubMedID: 28330354OAI: oai:DiVA.org:kau-65295DiVA, id: diva2:1161552
Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2018-01-19Bibliographically approved

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Emanuelsson, ChristianZhang, HanminMoons, EllenJohansson, Lars

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