1. Department of Electrical Engineering and Computer Science, Inter-University Semiconductor Research Center (ISRC), Seoul National University, Seoul 08826, Republic of Korea
2. Micro/Nano Process Group, Korea Institute of Industrial Technology (KITECH), Sangnok-gu, Ansan 15588, Republic of Korea
3. Department of Electronic Engineering, College of Electronics and Information, Kwangwoon University,
Nowon-gu, Seoul 01897, Korea