1. Siyuan Laboratory Guangzhou Key Laboratory of Vacuum Coating Technologies and New Energy Materials Department of Physics Jinan University Guangzhou Guangdong 510632 P. R. China
2. Department of Physics, Chemistry, and Biology (IFM) Linköping University Linköping SE‐58183 Sweden
3. Division of Physics and Applied Physics School of Physical and Mathematical Sciences Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
4. Energy Research Institute @NTU (ERI@N) Interdisciplinary Graduate Programme Nanyang Technological University 50 Nanyang Avenue, S2‐B3a‐01 Singapore 639798 Singapore