World’s first all-carbon solar cell

Researchers in the US and China have built a photovoltaic cell made entirely from carbon. The electrodes and light-active layers are made from a combination of three carbon allotropes – nanotubes, fullerenes and graphene. The efficiency of the prototype device is low, but the scientists say that this can be improved and that the potentially low cost and ease of processing makes an all-carbon solar cell an attractive proposition.  More...

http://www.rsc.org/chemistryworld/2012/11/all-carbon-solar-cell-graphene-nanotubes