Abhay Kumar Singh, PhD, is working in the Faculty of Engineering & the Built Environment, Dean's office, University of Johannesburg, South Africa. His research and innovation focus on various forms of chalcogenide led materials, including photovoltaic materials and technology, chalcogenide glasses, chalcogenide nanomaterials, and organic-inorganic composite materials, among others. He has published more than fifty international /national research articles and five book chapters, three books.