1. Electrical Materials Research Division, Korea Electrotechnology Research Institute (KERI), Changwon-si 51543, Republic of Korea
2. Wearable Platform Materials Technology Center (WMC), Department of Materials Science and Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Republic of Korea
3. School of Electrical Engineering, KAIST, Daejeon 34141, Republic of Korea
4. School of Materials Science and Engineering, University of Ulsan, Ulsan 44610, Republic of Korea