1. Department of Electronics and Information Convergence Engineering Institute for Wearable Convergence Electronics Kyung Hee University Yongin‐si Gyeonggi‐do 17104 Republic of Korea
2. Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) Northwestern Polytechnical University 127 West Youyi Road Xi'an 710072 China
3. Department of Physics Dongguk University Seoul 04620 Republic of Korea