1. Quantum Materials & Devices Laboratory, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu 641046, India
2. UGC−CPEPA Centre for Advanced Studies in Physics for the Development of Solar Energy Materials and Devices, Department of Physics, Bharathiar University, Coimbatore, Tamil Nadu 641046, India
3. Joint International Research Laboratory of Information Display and Visualization, School of Electronics Science and Technology, Southeast University, Nanjing 210009, China
4. KPR Institute of Engineering and Technology, Coimbatore, Tamil Nadu 641407, India