1. School of Materials Science and Engineering
2. Nanyang Technological University (NTU)
3. Singapore 639798
4. Singapore
5. Energy Research Institute@NTU (ERI@N)
6. Research Techno Plaza
7. Singapore 637553
8. Department of Physics
9. University of Warwick
10. Coventry CV4 7AL
11. UK
12. School of Engineering