1. Frontiers Science Center for Flexible Electronics Xi'an Institute of Flexible Electronics (IFE) and Xi'an Institute of Biomedical Materials and Engineering Northwestern Polytechnical University 127 West Youyi Road Xi'an 710072 P. R. China
2. Fujian cross Strait Institute of Flexible Electronics (Future Technologies) Fujian Normal University Fuzhou 350117 P. R. China
3. Key Laboratory of Flexible Electronics (KLoFE) and Institute of Advanced Materials (IAM) Nanjing Tech University 30 South Puzhu Road Nanjing Jiangsu 211816 P. R. China
4. Key Laboratory for Organic Electronics and Information Displays and Institute of Advanced Materials Nanjing University of Posts and Telecommunications Nanjing 210023 P. R. China