1. Shenzhen Key Laboratory of Thermoelectric Materials, Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China.
2. Department of Electrical and Computer Engineering, National University of Singapore, Singapore 117581, Singapore.
3. Shenzhen Thermo-Electric New Energy Co. Ltd., Shenzhen 518112, China.
4. Department of Materials Science and Engineering, National University of Singapore, Singapore 117575, Singapore.
5. Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), Singapore 138632, Singapore.
6. Guangdong-Hong Kong-Macao Joint Laboratory for Photonic-Thermal-Electrical Energy Materials and Devices, Southern University of Science and Technology, Shenzhen 518055, China.
7. Key Laboratory of Energy Conversion and Storage Technologies, Southern University of Science and Technology, Ministry of Education, Shenzhen 518055, China.