Solar cells or photovoltaic cells have changed in structure over time with advances in technology. Silicon is the most common material used in solar cells today. Now the manufacturer can get more cells from a given amount of silicon than before. This has reduced the cost of solar cells because they are now easier and cheaper to manufacture. This is good news for the green energy enthusiast who wants to make his or her own home solar panel system.  More Solar Cells are available for the home handy man to build solar panels. They come in various sizes and shapes although most popular for the home handy man wanting solar power is the usullay square or rectangluar in shape rather than circular. For more info visit home solar panel building