Actually, I think it's already been done. It's just incredibly inefficient.
http://www.google.com/search?hl=en&q...n+photovoltaic
"Nanosolar has developed a material of metal oxide nanowires that can be sprayed as a liquid onto a plastic substrate where it self-assembles into a photovoltaic film. A roll-to-roll process similar to high-speed printing offers a high-volume approach that doesn't require high temperatures or vacuum equipment. Nanosys intends for its solar coatings--based on structures called nanotetrapods--to be sprayed onto roofing tiles. And Konarka is developing plastic sheets embedded with titanium dioxide nanocrystals coated with light-absorbing dyes."
http://www.forbes.com/investmentnews...21soapbox.html
Here's what a wired nano looks like. See how small they are?
http://board.flashkit.com/board/imag.../2006/05/1.gif