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STM and XPS characterization of Zinc Phthalocyanine on InSb(001)
Department of Physics, Uppsala University.
KTH, School of Information and Communication Technology (ICT), Microelectronics and Applied Physics, MAP.
Department of Physics, Uppsala University.
MAX-laboratory, University of Lund.
Show others and affiliations
2008 (English)In: Surface Science, ISSN 0039-6028, E-ISSN 1879-2758, Vol. 602, no 2, 452-459 p.Article in journal (Refereed) Published
Abstract [en]

Zinc phthalocyanine (ZnPc) adsorbed on the InSb(0 0 1)-c(8 x 2) surface has been studied by scanning tunneling microscopy (STM) and X-ray photoelectron spectroscopy (XPS). Coverages from sub-monolayer to monolayer (ML) have been investigated. The molecules form ordered structures on the reconstructed rows of the surface with the molecular plane parallel to the surface. A change in the electronic structure between the sub-ML and higher coverages has been observed. Moreover, in order to study the influence of annealing on the electronic and geometric structures, the samples have been heated to elevated temperatures (about 640 K). In addition, multi-layer ZnPc films have been characterized by XPS measurements.

Place, publisher, year, edition, pages
2008. Vol. 602, no 2, 452-459 p.
Keyword [en]
Indium antimonide; Scanning tunneling microscopy; X-ray photoelectron spectroscopy; Zinc phthalocyanine; Annealing; Electronic structure; Monolayers; Scanning tunneling microscopy; X ray photoelectron spectroscopy; Elevated temperatures; Indium antimonide; Zinc phthalocyanine; Nitrogen compounds
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
URN: urn:nbn:se:kth:diva-7783DOI: 10.1016/j.susc.2007.10.052ISI: 000253277900008Scopus ID: 2-s2.0-38349136764OAI: oai:DiVA.org:kth-7783DiVA: diva2:12910
Note
QC 20100812. Uppdaterad från In press till Published 20100812.Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2017-12-14Bibliographically approved
In thesis
1. Phthalocyanine interfaces: the monolayer region
Open this publication in new window or tab >>Phthalocyanine interfaces: the monolayer region
2007 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

Organic molecules adsorbed on inorganic substrates are the topics of interest in this thesis. Interfaces of this kind are found in dye sensitized solar cells that convert solar energy to electricity, a promising environmentally friendly energy source which might provide a route to replace fossil fuels. Another field where these interfaces play a role is in molecular electronics, an approach to solve the down scaling in the ever increasing hunt for miniaturized electronic devices. The motivation for this work lies among other in these applications and surface science is a suitable approach to investigate the electronic and morphologic properties of the interfaces as it provides detailed knowledge on an atomic level.

Phthalocyanines are the organic molecules investigated and the inorganic substrates range from wide band gap via narrow band gap semiconductors to metals. Photoelectron and X-ray spectroscopy experiments are performed to shed light on the electronic properties of the adsorbed molecules and the substrate, as well as the chemical interaction between adsorbate and substrate at the interface. The ordering of the adsorbate at the interface is important as ordered molecular thin films may have other properties than amorphous films due to the anisotropic electronic properties of the organic molecules; this is investigated using scanning tunneling microscopy.

We find that the phthalocyanines are affected by adsorption when the substrate is TiO2 or Ag, where charge transfer from the molecule occurs or an interface state is formed respectively. The molecules are adsorbed flat on these surfaces giving a large contact area and a relatively strong bond. On Ag, ordered structures appear with different symmetry depending on initial coverage. The reactivity of the TiO2 surface is not ideal in the solar cell application and by modifying the surface with a thin organic layer, the negative influence on the adsorbed phthalocyanine is reduced. ZnO is not as reactive as TiO2, thanks maybe to the upright adsorption mode of the phthalocyanines. The semiconductor InSb is less reactive leading to self-assembled molecular structures on the (001) surface, either homogenously distributed in a one monolayer thick film or in strands along the reconstruction rows. InAs on the other hand has a larger influence on the adsorbed molecules resulting in a metallic film upon thermal treatment.

Place, publisher, year, edition, pages
Stockholm: KTH, 2007. 68 p.
Series
Trita-ICT/MAP, 2007:10
Keyword
phthalocyanine, III-V semiconductor, transition metal oxides, adsorption, self-assembly
National Category
Other Engineering and Technologies not elsewhere specified
Identifiers
urn:nbn:se:kth:diva-4571 (URN)978-91-7178-784-2 (ISBN)
Public defence
2007-12-18, N2, electrum 3, Isafjordsgatan 28, Kista, 10:00
Opponent
Supervisors
Note
QC 20100812Available from: 2007-12-10 Created: 2007-12-10 Last updated: 2010-08-12

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