Photovoltaic cells are those black squares on a solar panel. These have been the most expensive parts of a solar panel, making solar panels beyond the reach of most folks, but now at last, the prices have recently dropped, making solar panels a more affordable means of alternative energy.

These cells are not only becoming less expensive, but also more efficient, thanks to increasingly better designs, which allow them to focus the gathered sunlight on a more and more concentrated point.

The siz...
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