Affiliation: | a Department of Physics, Alagappa University, Karaikudi 630 003, Tamilnadu, India b Solar-Hydrogen-Fuel Cell Group, Energy Research Centre, UNAM 62580, Temixco, Morelos, Mexico c Department of Physics, T.D.M.N.S. College, T. Kallikulam 627 113, Tamilnadu, India |