About half of Canada’s residential electricity needs could be met if solar panels were installed on the roofs of residential buildings. At a single atom thick, graphene was the first 2D crystal ever discovered. It is a great candidate for solar cells because it is transparent, stronger than steel, and a better conductor than copper. It also can’t corrode. Researchers from the University of Saskatchewan aim to harness these qualities into a more efficient solar cell by modifying the material with oxygen to make a better charge collector. To do this, they take a close look at graphene oxide’s unique electronic signature.