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Resources and Links

The Howstuffworks web site has a page on How Solar Cells Work. Not only does the page give a good basic explanation of how solar cells create electricity, it also includes a discussion about some the current challenges to using them. 
The US Department of Energy maintains an Energy Efficiency and Renewable Energy web site.  Among the educational material on the web site is a lesson plan on Utilizing Photovoltaic Cells and Systems that contains a number of good suggestions as well as resources for materials.