1. Group of Semiconductors and Environmental Sensor Technologies-Energy Research Center, Faculty of Science, Mohammed V University, B. P. 1014, 10500 Rabat, Morocco
2. Laboratory of Condensed Matter and Interdisciplinary Sciences, Department of Physics, Faculty of Sciences, Mohammed V University, 10500 Rabat, Morocco
3. Laboratory of Physics of Condensed Matter, Department of Physics, Ibn Tofail University, 14000 Kenitra, Morocco
4. CSM, LPCMIO, Ecole Normale Supérieure, Mohammed V University, 10500 Rabat, Morocco