[1]Department of Physics and Engineering Physics Obafemi Awolowo University lle-Ife 220005 Nigeria;
[2]Department of Electronic and Electrical Engineering Obafemi Awolowo University Ile-Ife 220005 Nigeria;
[3]Centre for Energy Research and Development Obafemi Awolowo University Ile-lfe 220005 Nigeria;
[4]Department of Chemistry Obafemi Awolowo University Ile-Ife 220005 Nigeria;