1. CAS Center for Excellence in NanoscienceBeijing Key Laboratory of Micro‐nano Energy and SensorBeijing Institute of Nanoenergy and NanosystemsChinese Academy of Sciences Beijing 100083 P. R. China
2. The Beijing Municipal Key Laboratory of New Energy Materials and TechnologiesSchool of Materials Sciences and EngineeringUniversity of Science and Technology Beijing Beijing 100083 P. R. China
3. School of Nanoscience and TechnologyUniversity of Chinese Academy of Sciences Beijing 100049 P. R. China
4. Center on Nanoenergy ResearchSchool of Physical Science and TechnologyGuangxi University Nanning Guangxi 530004 P. R. China
5. College of Optoelectronic EngineeringShenzhen University Shenzhen 518060 China