Nanocoaxial solar cell
A solar cell must be thick enough to collect a sufficient amount of light, yet it needs to be thin enough to extract current. This is considered to be one of the great dilemmas with thin-film solar cells. But researchers at Boston College and École Polytechnique Fédérale de Lausanne, Switzerland created a nanocoax cell that fulfills both requirements. Constructed with amorphous silicon, the nanocoax cells yielded power conversion efficiency in excess of 8 percent, which is higher than any nanostructured thin film solar cell to date, the team reported.They are also constructed absent of crystalline semiconductors -- reducing the costs of construction.