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Scanning tunneling microscopy study of PTCDI on Sn/Si(111)-2√3×2√3
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0003-1583-1731
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Physics (from 2013).ORCID iD: 0000-0003-4165-1515
2019 (English)In: Journal of Chemical Physics, ISSN 0021-9606, E-ISSN 1089-7690, Vol. 150, no 4Article in journal (Refereed) Published
Abstract [en]

Perylene tetracarboxylic diimide molecules were evaporated onto a Sn/Si(111)-2 root 3 x 2 root 3 surface and studied using scanning tunneling microscopy (STM) and low energy electron diffraction. At low coverages, single molecules are locked into specific adsorption geometries, which are investigated in detail using high resolution STM. The electronic structure of these individual molecules was studied using bias dependent STM images. The molecules form 1D rows that become more common with increasing coverages. Possible intermolecular O center dot center dot center dot H interactions within the rows have been identified. At around half of a monolayer (ML), the rows of molecules interact with each other and form a commensurate 4 root 3 x 2 root 3 reconstruction. In a complete monolayer, several structures emerge as molecules fill in the space between the 4 root 3 x 2 root 3 stripes. Possible intermolecular interactions within the 1 ML structures have been discussed. At coverages above 1 ML, the growth is characterized by island growth, where the molecules are arranged according to the canted structure within the layers.

Place, publisher, year, edition, pages
New York: American Institute of Physics (AIP), 2019. Vol. 150, no 4
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
URN: urn:nbn:se:kau:diva-70247DOI: 10.1063/1.5070120ISI: 000457414600075OAI: oai:DiVA.org:kau-70247DiVA, id: diva2:1265136
Funder
Swedish Research Council, 2013-5291
Note

Artikeln tidigare publicerad som manuskript i Emanuelssons (2018) doktorsavhandling Electronic Structure and Film Morphology Studies of PTCDI on Metal/Semiconductor Surfaces

Available from: 2018-11-22 Created: 2018-11-22 Last updated: 2019-02-14
In thesis
1. Electronic Structure and Film Morphology Studies of PTCDI on Metal/Semiconductor Surfaces
Open this publication in new window or tab >>Electronic Structure and Film Morphology Studies of PTCDI on Metal/Semiconductor Surfaces
2018 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Organic semiconductors have received increasing attention over the last decades as potential alternatives for inorganic semiconductors. The properties of these films are highly dependent on their structural order. Of special interest is the interface between the film and its substrate, since the structure of the interface and the first few layers decide the growth of the rest of the film. The interface structure is determined by the substrate/molecule interactions, the intermolecular interactions and the growth conditions.

In this thesis, thin films of the organic semiconductor PTCDI have been studied using complementary microscopy and spectroscopy techniques on two metal-induced surface reconstructions, Ag/Si(111)-√3×√3 and Sn/Si(111)-2√3×2√3. These surfaces were chosen because they have different reactivities and surface periodicities. On the weakly interacting Ag-terminated surface, the film growth is mainly governed by the intermolecular interactions. This leads to well-ordered films that grow layer-by-layer. The interaction with the substrate is through electron charge transfer to the molecules from the substrate. This results in two different types of molecules with different electronic structure, which are identified using both STM images and PES spectra. On the more strongly interacting Sn-terminated surface the molecules adsorb in specific adsorption geometries and form 1D rows. At around 0.5 ML coverage the rows also interact with each other and form a 4√3×2√3 reconstruction and beyond one ML coverage the growth is characterized as island growth. The interaction with the substrate is mainly due to heavy electron charge transfer from the Sn atoms in the substrate to the C atoms in the imide group, but also the N atoms and the perylene core in PTCDI are involved. In these systems, the interactions with the surfaces result in new states inside the HOMO-LUMO gap, and the intermolecular interactions are dominated by O···H and O···H-N hydrogen bondings.

Abstract [en]

In our modern world we are surrounded by electronic devices that have become integral to how we live our lives. Central to most electrical devices are semiconductors such as silicon. The last decades a new type of materials, organic semiconductors, have received increasing attention. There exists a wide variety of these materials with a wide range of properties, so an organic molecule can be selected or even tailored for specific applications. Their tunable electronic properties have made it possible to use them in devices such as solar cells and light emitting diodes. Organic semiconductors have additional benefits, such as low weight and mechanical flexibility, which opens the horizon for new potential novel applications. A common device architecture involves layers of organic semiconductors sandwiched between metallic or semiconducting electrodes.

The thesis presents the use of complementary microscopy and spectroscopy methods to study thin films of the organic semiconductor PTCDI on two different semiconductor surfaces with different interaction strengths. The morphology of the film and its interface with the substrates are investigated. Additionally, the molecular interaction with these substrates are studied in detail.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2018. p. 55
Series
Karlstad University Studies, ISSN 1403-8099 ; 2018:57
Keywords
PTCDI, STM, LEED, XPS, UPS, NEXAFS, Organic Films, Semicondcutor Surfaces, Electronic Structure, Molecular Interactions, Film Morphology
National Category
Condensed Matter Physics
Research subject
Physics
Identifiers
urn:nbn:se:kau:diva-70262 (URN)978-91-7063-898-5 (ISBN)978-91-7063-993-7 (ISBN)
Public defence
2019-01-25, Eva Eriksson-salen, 21A 342, 651 88 Karlstad, Karlstad, 13:15 (English)
Opponent
Supervisors
Note

Paper 4 published in the thesis as manuscript. Now published.

Available from: 2018-12-20 Created: 2018-11-22 Last updated: 2019-02-14Bibliographically approved

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