* Corresponding authors

^a Department of Mathematics, Physics and Computing, Moi University, P. O. Box 3900-30100, Eldoret, Kenya

^b Bahir Dar Energy Center, Bahir Dar Institute of Technology, Bahir Dar University, Ethiopia

^c Department of Physics, College of Science, Bahir Dar University, Ethiopia

^d Department of Chemistry, Moi University, P. O. Box 3900-30100, Eldoret, Kenya

^e Department of Chemistry, Kisii University, P. O. Box 408-40200, Kisii, Kenya

^f Department of Physics, Nile University of Nigeria, Nigeria

^g Department of Theoretical and Applied Physics, African University of Science and Technology, Nigeria

^h Centre for Cyber-Physical Food, Energy and Water Systems (CCP-FEWS), Electrical and Electronic Engineering Science, University of Johannesburg, Johannesburg, South Africa

ⁱ CEMHTI-CNRS UPR3079, France