1. Flexible
Information Device Research Section, Electronics and Telecommunications Research Institute, Daejeon 34129, Republic of Korea
2. School
of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
3. Department
of Flexible and Printable Electronics, Polymer Materials Fusion Research
Center, Chonbuk National University, Jeonju 54896, Republic of Korea