1. Nano Hybrid Technology Research Center; Korea Electrotechnology Research Institute (KERI); Changwon-si Gyeongsangnam-do 642-120 South Korea
2. Electrical Functional Material Engineering; Korea University of Science and Technology; Changwon-si Gyeongsangnam-do 642-120 South Korea
3. Department of Electronics and Computer Engineering; Hanyang University; Seoul 133-791 South Korea
4. Max Planck Institute for Intelligent Systems; Heisenbergstrasse 3 Stuttgart 70569 Germany