1. School of Materials Science & Engineering, Nanyang Technological University, 639798, Singapore
2. Energy Research Institute @ NTU (ERI@N), Nanyang Technological University, 637553, Singapore
3. Materials Theory for Energy Scavenging (MATES) Lab, Harish-Chandra Research Institute(HRI) Allahabad, HBNI, Chhatnag Road, Jhunsi, Prayagraj (Allahabad), 211019, India
4. School of Electrical and Electronic Engineering, Nanyang Technological University, 639798, Singapore
5. School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore
6. Department of Electrical Engineering, City University of Hong Kong, Hong Kong