1. Department of Electrical Engineering, College of Engineering, King Khalid University, Abha, Saudi Arabia;
2. Organic Semiconductors Centre, School of Physics and Astronomy, University of St-Andrews, St-Andrews, United Kingdom;
3. Department of Computer Engineering, King Khalid University, Abha, Saudi Arabia;
4. Department of Metallurgical and Materials Engineering, National Institute of Technology Karnataka, Surathkal, India