Events Calendar

 
Colloquium

Applications of Electron microscopy imaging and spectroscopy to the study of functional oxides and degradation of other materials

Wednesday, 15 April 2015, 16:30-18:00
Talk given by Nicolas Gauquelin Electron Microscopy for Materials Science Department of Physics Universiteit Antwerpen, Belgium Abstract: Electron microscopy imaging and spectroscopy has become a very important part of research in physics in order to make the correlation between structure and properties of materials. In the world of oxides, the increasing interest in superlattices and multi-layered thin films is making the atomic visualization of interfaces crucial in the understanding of their properties. I will provide a few examples where the visualization of chemical composition and bonding (by atomically resolved EELS and ELNES), oxygen network (through the use of STEM-ABF imaging) and atomic arrangement (HAADF-STEM) gave crucial information for the understanding of physical phenomena such as superconductivity, increase of mobility of a two dimensional electron gas (2DEG) and magnetic properties. In a second part, the use of low-loss EELS to correlate macroscopic optical properties to structural changes on the local scale will be addressed (cationic ordering, commensurability and bond length change effects on photoluminescence). Then the possibilities offered by monochromation or higher energy resolution in EELS will be presented and compared with other more commonly used techniques such as XAS, Emission and Absorption Photoluminescence as well as Raman and HREELS spectroscopies. Finally the advances made using electron microscopy in the study of degradation mechanisms of perovskite solar cells under different atmosphere will be presented.
This event is part of the eventgroup INT Talks
Speaker
Dr. Nicolas Gauquelin

Universiteit Antwerpen
https://www.uantwerpen.be/nl/personeel/nicolas-gauquelin/
Organizer
Dr. Christian Kübel
Institute of Nanotechnology (INT)
Karlsruhe Institute of Technology (KIT)
Eggenstein-Leopoldshafen
Mail: christian kuebel does-not-exist.kit edu
Targetgroup
Interested / Everyone
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