1. College of Materials Science and Engineering Guangdong Research Center for Interfacial Engineering of Functional Materials Shenzhen University 3688 Nanhai Ave Shenzhen 518060 China
2. Institute of Materials Research and Engineering A*STAR (Agency for Science, Technology and Research) 2 Fusionopolis Way, Innovis, #08‐03 Singapore 138634 Singapore
3. Department of Electrical and Computer Engineering National University of Singapore Singapore 117583 Singapore
4. State Key Laboratory of Functional Materials for Informatics Shanghai Institute of Microsystem and Information Technology, CAS 865 Chang Ning Road Shanghai 200050 China
5. Joint Key Laboratory of Ministry of Education Institute of Applied Physics and Materials Engineering University of Macau Taipa Macau 999078 China