1. Fraunhofer Institute for Integrated Systems and Device Technology IISB, Schottkystr. 10, 91058 Erlangen, Germany
2. Chair of Electron Devices, University of Erlangen-Nürnberg, Cauerstr. 6, 91058 Erlangen, Germany
3. Compound Semiconductor Technology, RWTH Aachen University, 52074 Aachen, Germany
4. AIXTRON SE, 52134 Herzogenrath, Germany