1. Centre for Device Thermography and Reliability; H. H. Wills Physics Laboratory; University of Bristol; Tyndall Avenue Bristol BS8 1TL UK
2. Bristol Centre for Functional Nanomaterials; Centre for Nanoscience and Quantum Information; University of Bristol; Tyndall Avenue Bristol BS8 1FD UK
3. Hitachi Metals, Ltd.; Isagozawa 880 Hitachi City Ibaraki 319-1418 Japan
4. Graduate School of Engineering; University of Fukui; 3-9-1 Bunkyo Fukui 910-8507 Japan
5. SemiMap Scientific Instruments GmbH; Tullastr. 67 Freiburg 79108 Germany
6. II-VI Wide Bandgap Group; 20 Chapin Road, Suite 1007, P.O. Box 840 Pine Brook NJ 07058 USA