1. Engineering Research Center of Environment‐Friendly Functional Materials Ministry of Education Institute of Materials Physical Chemistry Huaqiao University Xiamen Fujian 361021 P. R. China
2. Helmholtz‐Zentrum Berlin für Materialien und Energie Kekuléstraße 5 D‐12489 Berlin Germany
3. Xiamen Institute Rare Earth Materials Haixi Institutes Chinese Academy of Science Xiamen 361021 P. R. China
4. Frontiers Science Center for Flexible Electronics Northwestern Polytechnical University Xi'an Shaanxi 710072 P. R. China
5. Univ Sci & Technol China Sch Microelect Hefei Anhui 230026 P. R. China
6. Institute of Chemical Sciences and Engineering École Polytechnique Fedérale de Lausanne Sion Valais CH‐1951 Switzerland