1. Department of Chemical and Biomolecular Engineering, National University of Singapore, 4 Engineering Drive 4, 117585 Singapore
2. Institute of Microelectronics, A*STAR (Agency for Science, Technology and Research), Fusionopolis Way, #08-02 Innovis Tower, 138634 Singapore
3. Department of Applied Physics, Chang’an University, Xi’an, Shaanxi 710064, China
4. Faculty of Science, Jiangsu University, Zhenjiang, Jiangsu 212013, China
5. Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575 Singapore
6. Facility for Analysis Characterisation Testing Simulation (FACTS), Nanyang Technological University, 50 Nanyang Avenue, 639798 Singapore