panel for electrical energy production from solar energy. It has photovotaic cells in silicon that can vary on efficiency depending on being composed by amorphous silicon, polycrystalline or monocrystalline. The cells of polycrystalline silicon are less expensive than those of monocrystalline because they require a less rigorous cell preparation process. The efficiency, however, is lower comparing to the monocrystalline silicon cells. Although, the research for alternative materials is intense and focus on the area of thin films, where the amorphous silicon fits. Thin film cells, use less quantity of material than those that present crystalline structures, they also use less quantity of energy in its manufacturing process. Which is, present a bigger energy efficiency.

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