1. State Key Laboratory of Optoelectronic Materials and Technologies, Guangdong Province Key Laboratory of Display Material and Technology and School of Electronics and Information Technology, Sun Yat-sen University, Guangzhou 510275, P. R. China
2. School of Materials Science and Engineering, Zhengzhou University, 100 Kexue Avenue, Zhongyuan, Zhengzhou, Henan 450001, P. R. China
3. National Laboratory of Solid-State Microstructures, School of Electronic Science and Engineering, Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, P. R. China
4. Center for Functional Sensor & Actuator (CFSN) and World Premier International Center for Materials Nanoarchitectonics (WPI-MANA), National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan
5. C-INK Co., Ltd., Sojya-shi, Okayama 719-1121, Japan