1. Semiconductor Research Centre, Department of Electronics and Communication Engineering, Punjab Engineering College (Deemed to be University), Chandigarh, India
2. Department of Physics, Punjab Engineering College (Deemed to be University), Chandigarh, India
3. School of Microelectronic Engineering, Universiti Malaysia Perlis, Kangar, Malaysia
4. Department of Electrical and Electronics Engineering, University of Manchester, Manchester, U.K.