1. College of Science and Engineering, Hamad Bin Khalifa University, Doha, Qatar
2. Qatar Environment and Energy Research Institute, Doha, Qatar
3. Electrical Engineering Department, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia
4. Group for Molecular Engineering of Functional Materials, Institute of Chemical Sciences and Engineering, EPFL Valais Wallis, Rue de l’Industrie 17, CP 440, CH-1951 Sion , Switzerland