1. Department of Physics, University of Agriculture and Environmental Sciences, Umuagwo, Nigeria
2. Department of Physics, College of Science, Sultan Qaboos University, Muscat, Sultanate of Oman
3. Department of Chemistry, University of Agriculture and Environmental Sciences, Umuagwo, Nigeria
4. Department of Physics, Faculty of Physical Sciences, Modibbo Adama University, Yola, Nigeria
5. Physics programme, Department of Physical Sciences, Bowen University, Iwo, Nigeria
6. Department of Physics, National Open University of Nigeria, Jabi-Abuja, Nigeria
7. Group of Optoelectronic of semiconductors and Nanomaterials, ENSAM, Mohammed V University, Rabat, Morocco
8. Institute of Applied Physics, Mohammed VI Polytechnic University, Ben Guerir, Morocco