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Adsorption and Molecular Orientation of Lutetium bi-Phthalocyanine Adlayers on Pristine Si(100)2x1 Surface
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Molecular and condensed matter physics.
University of Trieste.
University of Bourgone.
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(English)Manuscript (preprint) (Other academic)
Abstract [en]

A combined photoelectron spectroscopy (PES), X-ray absorption spectroscopy (XAS)

and scanning tunneling microscopy (STM) study has been performed to follow the

change in adsorption geometry and to characterize the adsorbate interaction with the

substrate for dierent thicknesses of lutetium biphthalocyanine (LuPc2) adlayers on

pristine Si(100)-2x1 reconstructed stepped surface. A shift to lower binding energies

with increasing thickness has been shown. The STM results showed clustering of

LuPc2 starting from submonolayer coverages and two distinct adsorption types have

been identied. The STM and PES results have been linked together to propose two

dierent adsorption types involving a stronger and weaker interaction with the Si

dangling bonds. A change in average angle of molecules with respect to the normal

of the surface for increasing thicknesses has been seen from the XAS measurements,

leading to disordered layers for thicker films.

Keyword [en]
silicon, phthalocyanines, photoelectron spectroscopy, scanning tunneling microscopy
National Category
Condensed Matter Physics
URN: urn:nbn:se:uu:diva-217079OAI: oai:DiVA.org:uu-217079DiVA: diva2:691849
Available from: 2014-01-29 Created: 2014-01-29 Last updated: 2014-04-29
In thesis
1. Structure and Electronic Properties of Phthalocyanine Films on Metal and Semiconductor Substrates
Open this publication in new window or tab >>Structure and Electronic Properties of Phthalocyanine Films on Metal and Semiconductor Substrates
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The current thesis presents fundamental studies of phthalocyanines (Pcs), a group of organic macro-cycle molecules. The use of phthalocyanine molecular films in devices with a variety of possible technological applications has been the reason of the many studies dedicated to such molecules during the last decades.

Core and valence photoelectron spectroscopies (PES), X-ray absorption spectroscopy (XAS) and scanning tunneling microscopy (STM) techniques are used to study phthalocyanine molecules in gas phase and adsorbed on gold (111) and silicon Si(100)-2x1 substrates. Density functional theory (DFT) is used to obtain further insights in the electronic structure of the phthalocyanines.

The aim of our studies is to get a deeper understanding into the molecule-molecule and molecule-substrate interactions, a fundamental requirement for improving the devices based on such molecular materials.

Gas phase PES and XAS studies and single molecule DFT calculations are performed on the valence band (VB) of iron phthalocyanine (FePc), manganese phthalocyanine (MnPc) and metal-free phthalocyanine (H2Pc). The VB simulations have shown how the metal atom of the Pc influences the inner valence states of the molecules. The HOMO of the H2Pc and FePc is formed by mostly C2p states, whereas the HOMO of MnPc has mainly Mn3d character.

PES studies of H2Pc on Au(111) have revealed the influence of the surface on the adsorption of the monolayer. XAS studies indicate formation of ordered monolayer with the Pc ligands parallel to the surface and the change of the molecular tilt angle with increasing thicknesses. For LuPc2 adsorbed on Au(111), STM study demonstrates a formation of bilayer instead of a monolayer.

A comparison between the results of LuPc2 adsorbed on pristine or passivated Si(100)-2x1 confirmes the different reactivities of these surfaces: LuPc2 retains many molecular-like characters, when adsorbed on the innert passivated Si. Instead, on the more reactive pristine Si surface, the spectroscopic results have indicated a more significant interaction, possible hybridization and charge redistribution between the molecules and the surface. Moreover, STM images show a modification of the geometrical shape of the molecules, which are proposed to adsorb in two different geometries on the pristine Si surface.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2014. 51 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1119
Phthalocyanines, silicon(100), Au(111), photoelectron spectroscopy, scanning tunneling microscopy, surface science, organic molecules on surface
National Category
Natural Sciences Condensed Matter Physics
urn:nbn:se:uu:diva-217086 (URN)978-91-554-8867-3 (ISBN)
Public defence
2014-03-14, Häggsalen, Ångström Laboratory, Lägerhyddsvägen 1, Uppsala, 10:15 (English)
Available from: 2014-02-21 Created: 2014-01-29 Last updated: 2014-04-29

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