Direct conversion of light into electricity. Materials absorbing photons and being ionized such that electrons are released are known to have a photoelectric effect, often called solar cells. When the free electrons released are captured, electric current is the result. Solar cells are made of materials such as silicon (wafers) or non-silicon materials such as cadmium telluride, treated to form an , positive on one side and negative on the other. Due to the semiconductor structure the electrons are forced in one direction creating the current. The current produced is directly dependent on how much light that strikes the module.
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