Contact

Yasmin Ahmed Salem, M.A.
Yasmin Ahmed Salem
Press and Public Relations Officer
Phone: +49 211 6792 722
Room: 222

Scientific Events

Scientific Events

Month:

2390 1456997837

Adventures at the Atomic Scale: Diffusion and Defect Chemistry using Correlative STEM and Atom Probe Tomography

Developing materials for optical and electrical applications often requires an understanding of the relationships between processing and point defects. Atomic scale relationships such as these are frequently elusive to understand due to a lack of characterization techniques. In this work, I will show examples of nanoscale and atomic scale characterization of oxide and semiconductor point defects determined through atom probe tomography (APT). Specifically, oxygen stoichiometries in oxygen and proton conducting oxides can be directly related to the electrical conductivities where grain boundaries dominate transport. Laser assisted APT also allows for unique opportunities for measuring atomic diffusion where thermal transport can assist transformations from metastable states. Using a “Dynamic” atom probe, atomic scale diffusion can be quantified at the atomic scale in 3-dimensions using a combination of APT and in-situ electron diffraction with a temporal resolution of better than 1 ns. An in-situ STEM / APT instrument engineered and constructed at CSM will be detailed as well as opportunities for using such data for improved APT data reconstruction. [more]

CM special seminar

1810 1432744643

Oxides for Energy and Electronics

Wide-band-gap oxides have many unique properties that make them ideally suited for applications in energy technologies. They are transparent in the visible, but can be doped to near-metallic conductivities, enabling use as contact layers to optoelectronic devices such as solar cells and light-emitting diodes. They can also be used, passively, in energy-efficient window coatings, or actively in smart windows or transparent electronics for displays. When grown as high-quality heterostructures, oxide-based transistors can be used in power electronics that boost the efficiency of power conversion, currently a large source of loss in applications ranging from hybrid cars to data centers. Complex oxides (containing transition metals or rare-earth elements) offer the prospect of revolutionary new electronic devices. I will discuss how cutting-edge first-principles calculations provide key information about materials properties and enable designing new materials combinations for specific applications. [more]

2170 1435226626

„How to get your piece of the pie: Crafting a competitive grant application.”

Workshop for PhD students and early stage PostDocs. The number of participants is limited to 30. Please register until Monday, 20 July 2015 by setting a mail with your contact data to k.huebel@mpie.de. [more]

 
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