1. Department of Materials Engineering, The University of Tokyo, Tokyo 113-8656, Japan
2. Department of Electronics, Nagoya University, Nagoya 464-8603, Japan
3. Department of Chemistry, Saitama University, Saitama 338-8570, Japan
4. International Center for Materials Nanoarchitectonics, National Institute for Materials Science, Ibaraki 305-0044, Japan
5. Research Center for Functional Materials, National Institute for Materials Science, Ibaraki 305-0044, Japan
6. Taiwan Semiconductor Manufacturing Company (TSMC), Ltd., Hsinchu 300-75, Taiwan