Nano Photovoltaics have been theorized to be a possible answer to the world's energy crisis. However, not much has been researched so far with regards to how nanao photovoltaic units could be built in an efficient way so that these devices can become obiquitous in the world. If it were possible to easily build such devices, it would be possible to have medical equipment and comunication's systems working in areas where the electric grid doesn't reach and where power generation is reserved for the privileged.
A number of scientific organizations are already tackling this problem. For more information regarding this, browse through the links in the "References and Related Information" section which is in the menu to the left.