1. Laboratory of Semiconductor Materials, Institute of Materials, École Polytechnique Fédérale de Lausanne (EPFL), Lausanne, Switzerland
2. Department of Experimental Physics, Faculty of Fundamental Problems of Technology, Wrocław University of Science and Technology, Wrocław, Poland
3. Materials Science Factory, Instituto de Ciencia de Materiales de Madrid (ICMM-CSIC), Madrid, Spain
4. Laboratory of Semiconductor Materials, Institute of Materials, EPFL, Lausanne, Switzerland