http://en.wikipedia.org/wiki/Solar_power

http://www.eia.doe.gov/kids/energyfacts/sources/renewable/solar.html

http://www.ucsusa.org/clean_energy/renewable_energy_basics/how-solar-energy-works.html

http://www.howstuffworks.com/solar-cell.htm

http://home.clara.net/darvill/altenerg/solar.htm