1. Namlab gGmbH, Noethnitzer Strasse 64 01187, Dresden, Germany
2. Center for Advancing Electronics Dresden (CfAED), TU Dresden, 01062 Dresden, Germany
3. Institute of Advanced Composite Materials, Korea Institute of Science and Technology, Wanju-gun, Joellabuk-do 55324, South Korea
4. School of Electrical Engineering, Korea University, Seoul 136-701, South Korea
5. Institute of Solid State Electronics, TU Wien, 1040 Wien, Austria