1. School of Electronics Engineering, Kyungpook National University, Daegu 702-701, South Korea
2. Institute of Semiconductor Fusion Technology, Kyungpook National University, Daegu 702-701, South Korea
3. SOITEC, Bernin 38190, France
4. Institute of Microelectronics, Electromagnetism and Photonics, Grenoble Polytechnic Institute, Minatec, Grenoble 38016, France
5. Korea Institute of Science and Technology, Seoul 02792, South Korea