Abstract
Ordered films of polycyclic aromatic hydrocarbons (PAHs) and porphyrins with functional (e.g. thiophene) side-groups are good candidates for (opto-)electronic applications where fast charge separation and transport are required. Such highly ordered thin films of PAHs, including discotic hexa-peri-hexabenzocoronene (HBC) and C132-C16,4, as well as brominated functionalized porphyrin molecules have been grown from solutions on semi-metallic molybdenum disulfide substrates and characterized by angle-resolved valence band photoelectron spectroscopy. A vertical growth of self-assembled supramolecular columns perpendicular to the basal plane of the substrate along with their lateral ordering on the surface has been achieved. Annealing made it possible to increase the structural order in the HBC columns, with molecules positioned at a regular offset from the columnar axis. This permitted the formation of extended π-electronic states with a bandwidth of at least 0.1-0.2 eV at room temperature.
Original language | English |
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Pages (from-to) | 79-83 |
Number of pages | 5 |
Journal | Synthetic Metals |
Volume | 147 |
Issue number | 1-3 |
DOIs | |
State | Published - Dec 7 2004 |
Event | Supramolecular Approaches to Organic Electronics and Nanotechn. - Strasbourg, France Duration: May 24 2004 → May 28 2004 |
Bibliographical note
Funding Information:The authors thank S. Wiklund (MAX-Lab), M. Tschaplyguine (Uppsala University, Sweden), C. Suess, R. Murdey (both Linköping University), and I. Kuritka (Linköping University, permanent address: Tomas Bata University, Zlin, Czech Republic) for fruitful discussions and experimental help. Work in Linköping is supported by the Swedish Science Research Council (VR, grants no. 12252020 and 12252003), the EU-Growth project MAC-MES (project no. GRD2-2000-30242), the Center for Advanced Molecular Materials, (CAMM), funded by the Swedish Foundation for Strategic Research (SSF) and by the European Community Research Training Network LAMINATE (Project number 00135). Work in Mainz is funded within the “Zentrum für multifunktionelle Werkstoffe und miniaturisierte Funktionseinheiten” (Grant No. BMBF 03N 6500).
Keywords
- Hexa-peri-hexabenzocoronene
- Ordered films
- Self-assembled supramolecular columns
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Condensed Matter Physics
- Mechanics of Materials
- Mechanical Engineering
- Metals and Alloys
- Materials Chemistry