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Institute of Solid State Physics

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Solid state physics is the study of how atoms arrange themselves into solids and what properties these solids have. By examining the arrangement of the atoms and considering how electrons move among the atoms, it is possible to understand many macroscopic properties of materials such as their elasticity, electrical conductivity, or optical properties. The Institute of Solid State Physics focuses on organic, molecular, and nanostructured materials. Often detailed studies of the behavior of these materials at surfaces are made. Our research provides the foundation for important advances in technology such as energy efficient lighting, solar cells, electronic books, environmental sensors, and medical sensors.


Computational Material Design


Doping molecular wires


Computational Material Science


Self-assembled monolayer transistors

 

TUG/KFU Physics Colloquium Winter 2019
Tuesday 28 January 2020      KFU HS 5.01

17:00 - 18:00

Substrate-induced growth of organic thin films - from (sub-) monolayers to multilayers
Prof. Dr. Peter Zeppenfeld, Institute of Experimental Physics, Surface Science Division, Johannes Kepler University Linz

Abstract: Highly ordered organic thin films with specific electronic or optical properties form the basis of many applications and devices, such as organic field effect transistors (OFETs) or light emitting diodes (OLEDs). This has stimulated
fundamental research on how particular molecular structures with specific physical properties can be designed.Here we will discuss how single-crystalline surfaces can serve as templates for the growth of epitaxial layers with well-defined molecular arrangements and orientations. I will concentrate on rod-shaped molecules like oligophenylenes or acenes deposited on pristine and oxygen covered metal surfaces, which were studied by a combination of conventional surface science tools (STM, LEED, PEEM) and surface optical spectroscopy (RDS, DRS). Already during the formation of the very first monolayer different phases and molecular configurations may form, depending on the substrate crystalline orientation, molecular coverage and growth conditions [1-3]. These monolayers act as templates for the growth of subsequently deposited layers. The latter can either replicate the existing monolayer structure but often undergo structural and/or orientational phase transitions above a certain critical thickness [4, 5]. We will illustrate how these configurational changes can lead to drastic modifications of the electronic or optical properties as a function of the film thickness.

[1] L.D. Sun, J. Gall, G. Weidlinger, C.Y. Liu, M. Denk, P. Zeppenfeld, Phys. Rev. Lett. 110, 106101 (2013)
[2] Th. Wagner, M. Györök, D. Huber, P. Zeppenfeld, E.D. Glowaki, J. Phys. Chem. C 118, 10911 (2014)
[3] A. Thomas, W. Malone, Th. Leoni, A. Ranguis, Z. Chen, O. Siri, A. Kara, P. Zeppenfeld,
C. Becker, J. Phys. Chem. C 122, 10828 (2018)
[4] L.D. Sun, S. Berkebile, G. Weidlinger, M. Denk, R. Denk, M. Hohage, G. Koller, F.P. Netzer, M.G. Ramsey,
P. Zeppenfeld, Phys. Chem. Chem. Phys. 14, 13651 (2012)
[5] A. Navarro-Quezada E. Ghanbari, Th. Wagner, P. Zeppenfeld, J. Phys. Chem. C 122, 12704 (2018)