1. Shenzhen Key Laboratory of Advanced Thin Films and Applications, Key Laboratory of Optoelectronic Devices and Systems, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P. R. China
2. Department of Physics, Faculty of Sciences, University of Central Punjab, Lahore 54000, Pakistan
3. Univ Rennes, CNRS, ISCR (Institut des Sciences Chimiques de Rennes) UMR 6226, Rennes F-35000, France
4. Hefei National Laboratory for Physical Sciences at Microscale, CAS Key Laboratory of Materials for Energy Conversion, Department of Materials Science and Engineering, School of Chemistry and Materials Science, University of Science and Technology of China, Hefei, Anhui 230026, P. R. China