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Ph.D Defense by Mads Brincker

Reliability of metal films and interfaces in power electronic devices.


28.06.2018 kl. 13.00 - 16.00



Nowadays, a large part of energy is either directly produced or consumed as electricity. Production and conversion of electricity requires robust and reliable power electronics. One part of this PhD project deals with the physical mechanisms leading to structural and compositional changes in metal films which are used in packaging with a final goal to improve the reliability of power modules. Passive thermal and active power cycling tests are applied to accelerate the effects leading to failure. The change of electrical properties as well as structure and composition are investigated by four-point probing, micro-sectioning, optical and electron microscopy, electron backscatter diffraction, energy dispersive X-ray spectroscopy, etc. By comparing the electrical and microstructural evolution of the Al layers subjected to passive and active cycling, thermo-mechanical stress is found to be the main stressor. A second part of the PhD is devoted to the fabrication and reliability study of transient liquid phase (TLP) bonded joints. A recipe for fabrication of strong Cu-Sn-Cu bonds with superior thermal capabilities as an alternative to traditional soldering is developed. For the specific application, a novel Cu-Mo hybrid baseplate technology involving Cu-Sn-Ag-Mo TLP bonds is suggested demonstrating good structural and compositional homogeneity yielding high shear strength. During the presentation a broad introduction to the subjects will be given, and the main scientific results will be summarized.


Assessment Committee:  

Dr. Lars Diekhöner, (chairman)
Aalborg University, Denmark

Dr. Golta Khatibi,
Technical University of Vienna, Austria

Dr. Olaf Wittler,
Fraunhofer IZM, Germany



Associate Professor, Vladimir Popok
Aalborg University, Denmark

The PhD defense will be hosted by Dr. Leonid Gurevich. The lecture constitutes a 45 minutes presentation by Mads Brincker followed by a short break and a discussion session with questions from the opponents and the auditorium.


After the defense, at approx. 16.00 hours, the Department of Materials and Production will welcome all to a reception.




Department of Materials and Production


Skjernvej 4A, 9220 Aalborg

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