1. Department of Materials Science and Engineering
2. National Tsing Hua University
3. Hsinchu
4. Republic of China
5. Institute of Fundamental and Frontier Sciences
6. University of Electronic Science and Technology of China
7. Chengdu 611731
8. P. R. China
9. School of Energy and Chemical Engineering
10. Ulsan National Institute of Science and Technology
11. Ulsan 44919
12. South Korea
13. Department of Physics