Types of Solar Cells...described by The U.S. Department of Energy.

Solar Cell Materials... The U.S. Department of Energy explains what solar cells are made of.

Solar Cell Structures...The U.S. Department of Energy explains the four basic designs for solar cells.

Thin Film Solar Cells...from How Stuff Works.

The World's Most Efficient Solar Cell

Using Regular Windows as Solar Cells...from the Massachusette Institute of Technology