1. Energy Research Institute @ NTU (ERI@N) Interdisciplinary Graduate School Nanyang Technological University Singapore 637553 Singapore
2. School of Mechanical and Power Engineering East China University of Science and Technology 130 Meilong Road Shanghai 200237 P. R. China
3. Institute of Flexible Electronics (IFE) Northwestern Polytechnical University (NPU) 127 West Youyi Road Xi'an 710072 P. R. China
4. Institute for Superconducting and Electronic Materials Australian Institute for Innovative Materials University of Wollongong Wollongong NSW 2522 Australia