Photovoltaic cells are those black squares, an arrangement of which comprises a solar panel. They are becoming more and more efficient and gradually less expensive all the time, thanks to better designs, which allows them to focus the gathered sunlight on a more concentrated point.

The size of the cells is decreasing, as their efficiency rises, meaning that each cell becomes cheaper to produce and therefore more cost effective, while being more productive.

The price of producing solar generat...
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