1. Optic & Display Material CenterKorea Institute of Ceramic Engineering & Technology Jinju 52851 Republic of Korea
2. Department of Electrical and Computer EngineeringMcGill University 3480 University Street Montreal Quebec H3A 0E9 Canada
3. Semiconductor Materials Process LaboratorySchool of Advanced Materials EngineeringChonbuk National University Deokjin‐dong 664‐14 Jeonju 561‐756 Republic of Korea