1. Center for Device Thermography and Reliability (CDTR), H. H. Wills Physics Laboratory, University of Bristol, Tyndall Avenue, Bristol BS8 1TL, United Kingdom
2. Institute for Materials Research (IMO), Hasselt University, Wetenschapspark 1, 3590 Diepenbeek, Belgium
3. IMOMEC, IMEC vzw, Wetenschapspark 1, 3590 Diepenbeek, Belgium
4. Electron Microscopy for Material Science (EMAT), University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium
5. EpiGaN NV, Kempische Steenweg 293, 3500 Hasselt, Belgium