print me a solar cell
New MIT-developed materials make it possible to produce photovoltaic cells on paper or fabric, nearly as simply as printing a document.

Almost as cheaply and easily as printing a photo on your inkjet, an inexpensive, simple solar cell has been created on that flimsy sheet, formed from special “inks” deposited on the paper. You can even fold it up to slip into a pocket, then unfold it and watch it generating electricity again in the sunlight.

http://web.mit.edu/newsoffice/2011/printable-solar-cells-0711.html