1. Advanced Materials and Devices Laboratory (AMDL) Department of Physics Bharathiar University Coimbatore 641 046 Tamil Nadu India
2. Shenzhen Institute of Advanced Electronic Materials Shenzhen Fundamental Research Institutions Shenzhen Institutes of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 China
3. Advanced Materials and Devices Laboratory (AMDL) Department of Nanoscience and Technology Bharathiar University Coimbatore 641 046 Tamil Nadu India