1. Department of Chemistry and Materials Research Center Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
2. Displays and Devices Research Lab. School of Electrical and Electronics Engineering Chung‐Ang University Seoul 06974 Korea
3. Department of Materials Science and Engineering Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
4. School of Automation Engineering University of Electronic Science and Technology of China (UESTC) Chengdu Sichuan 611731 China
5. Flexterra Corporation 8025 Lamon Avenue Skokie IL 60077 USA