 Traditional photovoltaic cells are made from thin sheets of silicon covered by glass plates.In the GreenSun process, it is only the outer edges of the glass plates that are covered by thin strips of silicon.The physicists and chemists at GreenSun, led by Renata Reisfeld, coat the glass with metallic nanoparticles and dyes to cause the sunlight falling on the glass to diffuse sideways toward the edges where the silicon strips turn it into electricity.