1. Energy Research Institute @NTU (ERI@N), Research Techno Plaza, X-Frontier Block, Level 5, 50 Nanyang
Drive, Singapore 637553
2. School
of Materials Science and Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798
3. Division
of Physics and Applied Physics, School of Physical and Mathematical
Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore, 637371
4. Singapore−Berkeley Research Initiative for Sustainable Energy, 1 Create Way, Singapore 138602, Singapore