1. Interdisciplinary Graduate
School, Energy Research Institute at NTU, 639798 Singapore
2. Energy Research Institute
@ NTU (ERI@N), Research Technoplaza, Nanyang Technological University, Nanyang Drive, 637553 Singapore
3. Division
of Physics and Applied Physics, Nanyang Technological University, 637371 Singapore
4. Laboratory of Photonics
and Interfaces, Department of Chemistry and Chemical Engineering, Swiss Federal Institute of Technology, Station 6, Lausanne CH-1015, Switzerland
5. School of Materials Science
and Engineering, Nanyang Technological University, Nanyang Avenue, 639798 Singapore