1. Department of Physics, Energy Materials and Devices Lab, National Institute of Technology-Warangal, Hanamkonda, Telangana, India 506004
2. Department of Physics, National Institute of Technology-Warangal, Hanamkonda, Telangana, India 506004
3. Department of Electronics and Communication Engineering, Flexible Electronics Lab, National Institute of Technology-Warangal, Hanamkonda, Telangana, India 506004