1. School of Electrical and Electronic EngineeringNanyang Technological University 50 Nanyang Avenue Singapore 639798 Singapore
2. Institute of Engineering ThermophysicsChinese Academy of Sciences Beijing 100190 China
3. Sibley School of Mechanical and Aerospace EngineeringCornell University Ithaca NY 14853 USA
4. School of Materials Science and EngineeringCentral South University Changsha 410083 China
5. Center for Information Photonics and Energy MaterialsShenzhen Institutes of Advanced TechnologyChinese Academy of Sciences Shenzhen 518055 China
6. School of Materials Science and EngineeringBeihang University Beijing 100191 China
7. CINTRA CNRS/NTU/THALESUMI3288Research Techno Plaza 50 Nanyang Drive Singapore 637553 Singapore