1. Imec − Partner in Solliance, Kapeldreef 75, 3000 Leuven, Belgium
2. Department of Electrical Engineering, KU Leuven, 3000 Leuven, Belgium
3. Zernike Institute for Advanced Materials, University of Groningen, 9712 CP Groningen, Netherlands
4. Department of Applied Physics, TU Eindhoven, 5600 MB Eindhoven, Netherlands