1. Department Institute of Flexible Electronics (IFE) Frontiers Science Center for Flexible Electronics (FSCFE) Shaanxi Institute of Flexible Electronics (SIFE) and Shaanxi Institute of Biomedical Materials and Engineering (SIBME) Northwestern Polytechnical University (NPU) Xi'an 710072 P. R. China
2. College of Electronics and Information Engineering Sichuan University Chengdu 610064 P. R. China
3. Hefei National Laboratory for Physical Sciences at the Microscale School of Chemistry and Materials Science University of Science and Technology of China Hefei Anhui 230026 P. R. China
4. Natural Sciences and Science Education National Institute of Education Nanyang Technological University Singapore 637616 Singapore
5. Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM) Nanjing Tech University (NanjingTech) Nanjing 211816 P. R. China