1. National Institute for Nanomaterials Technology, Pohang University of Science and Technology, Cheongam-Ro 77, 37673 Pohang, Republic of Korea
2. Fraunhofer Institute for Integrated Systems and Device Technology, Schottkystrasse 10, 91058 Erlangen, Germany
3. Department of Semiconductor and Chemical Engineering, Chonbuk National University, Baekje-daero 567, 54896 Jeonju, Republic of Korea
4. NTT Hi-Tech Institute, Nguyen Tat Thanh University, A Nguyen Tat Thanh Street, 298-300 Ho Chi Minh City, Vietnam