*Fumihiro Fujie1, Shunta Harada1,2, Hiromasa Suo3,4, Tomohisa Kato4, Toru Ujihara1,2,5
(1. Department of Materials Process and Eng., Nagoya Univ.(Japan), 2. Center for Integrated Res. of Future Electronics (CIRFE), Inst. of Materials and Systems for Sustainability (IMaSS), Nagoya Univ.(Japan), 3. Showa Denko K. K.(Japan), 4. National Inst. of Advanced Indus. Sci. and Tech. (AIST)(Japan), 5. GaN Advanced Device Open Innovation Lab. (GaN-OIL), National Inst. of Advanced Indus. Sci. and Tech. (AIST)(Japan))