1. School of Nano Technology and Nano Bionics University of Science and Technology of China Hefei 230026 P. R. China
2. Printable Electronics Research Centre Suzhou Institute of Nano‐Tech and Nano‐Bionics Chinese Academy of Sciences Suzhou 215123 P. R. China
3. Shenzhen China Star Optoelectronics Technology Co., Ltd No. 9‐2 Tangming Avenue Shenzhen Guangdong Province 518132 P. R. China
4. School of Materials Science and Engineering Shanghai University Shanghai 200444 P. R. China
5. Beijing Engineering Research Center of Printed Electronics Beijing Institute of Graphic Communication No.1 Xinghua Street, Daxing District Beijing 102600 P. R. China
6. School of Chemical and Biomolecular Engineering the University of Sydney NSW 2006 Australia