Interplay between Morphology and Electronic Structure in α-Sexithiophene Films on Au(111)
| Autor: | Thorsten Wagner, Ebrahim Ghanbari, Martin Weinelt, Malte Wansleben, Kristof Zielke, Michael Györök, Cornelius Gahl, Sebastian Baum, Peter Zeppenfeld, Wibke Bronsch, Andrea Navarro-Quezada |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Photoemission spectroscopy Thermal desorption spectroscopy Exciton 02 engineering and technology Electronic structure 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences Surfaces Coatings and Films Electronic Optical and Magnetic Materials General Energy Chemical physics Picosecond Molecule Crystallite Physical and Theoretical Chemistry 0210 nano-technology Wetting layer |
| Zdroj: | The Journal of Physical Chemistry C. 123:7931-7939 |
| ISSN: | 1932-7455 1932-7447 |
| Popis: | The properties of organic films are strongly influenced by their growth and structure. In this work, we link the results from three different techniques to elucidate the interplay between the morphology and the electronic structure of α-sexithiophene films grown on Au(111) surfaces. Photoelectron emission microscopy and thermal desorption spectroscopy reveal the growth of a two-layer thick wetting layer at room temperature. On top of the wetting layer, the molecules start to form μm-sized crystallites, which are statistically distributed over the surface. This transition in the growth mode is reflected in the electronic structure of the system, studied by two-photon photoemission spectroscopy. While in the wetting layer, exciton formation is suppressed by the interaction with the metal substrate, Frenkel excitons with picosecond lifetimes are observed in the three-dimensional crystallites. |
| Databáze: | OpenAIRE |
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