Make your own organic solar cells.
Previously, the answer was "no".
The latest issue of Science in School contains a "how to" for making organic solar cells from dyes instead of silicon, that produce useful amounts of electricity.
Link to "how to".
Also in this issue...
The archive of back issues is here (can you find my article?).
If you browse the magazine, and like it, you might consider passing the URL on to friends, colleagues and potential advertisers. Previously funded by an EU grant, the print magazine is distributed free. The website is funded until October 2010, but the print magazine needs finance (sound familiar?)
Anyway, if you are part of, or know of, a company that would like to target their advertising to science educators across Europe, point them at http://www.scienceinschool.org/advertising or contact them directly at firstname.lastname@example.org