<http://schema.org/caption>
"The all-carbon solar cell consists of a photoactive layer, made of carbon nanotubes and buckyballs, sandwiched between two electrodes made of single-walled carbon nanotubes and graphene (Photo: Mark Shwartz)"^^<http://www.w3.org/2001/XMLSchema#string>
<http://newatlas.com/stanford-all-carbon-solar-cell/24819/>