1. State Key Laboratory of Electronic Thin Films and Integrated Devices School of Optoelectronic Science and Engineering University of Electronic Science and Technology of China (UESTC) Chengdu 610054 P. R. China
2. Department of Chemistry Center for Light Energy‐Activated Redox Processes and the Materials Research Center Northwestern University 2145 Sheridan Road Evanston IL 60208 USA
3. Materials Science and Engineering Division National Institute of Standards and Technology Gaithersburg MD 20899 USA
4. Department of Materials Science and Engineering Department of Electrical and Computer Engineering Center for Light Energy‐Activated Redox Processes and the Materials Research Center Northwestern University Evanston IL 60208 USA
5. Flexterra Corporation 8025 Lamon Avenue Skokie IL 60077 USA