1. National Center for International Joint Research of Electronic Materials and Systems, Henan Key Laboratory of Laser and Opto-Electric Information Technology, School of Information Engineering, Zhengzhou University, Zhengzhou 450052, Henan, P. R. China
2. Department of Electronic Materials Engineering, Research School of Physics and Engineering, The Australian National University, Canberra ACT 2601, Australia
3. Institute of Materials and Systems for Sustainability, Nagoya University, Nagoya 464-8601, Japan
4. Institute of Photonics and Optoelectronics, and Department of Electrical Engineering, National Taiwan University, No. 1, Section 4, Roosevelt Road, Taipei 10617, Taiwan