1. Photovoltaic Metrology Section, Advanced Materials and Device Metrology Division, CSIR-National Physical Laboratory, New Delhi-110012, India
2. Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
3. Sensor Devices and Metrology, Environmental Science and Biomedical Instrument Metrology Division, CSIR-National Physical Laboratory, New Delhi-110012, India