Solar cells are often built from semiconductor silicon crystals and add some impurities such as phosphorus to improve their ability to conduct electricity, and when sunlight falls on silicon crystals, it absorbs them. This stimulates the electrons, which are bonded together by covalent bonds of emancipation, and begin to move randomly within the crystalline silicon, generating an electric current.
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Among the most famous types of solar cells, we suggest the following:
Made of pure silicon, the most efficient type of photovoltaic cell to convert photovoltaic energy into electrical energy; it is 20% efficient and lasts longer than other species; however, it is expensive.
The first solar cells manufactured in 1981, are made of silicon crystals are less purity than those used in the manufacture of monocrystalline solar cells, so it is less efficient; the efficiency ranges between 13-16%, which is Less expensive as well.
Solar cells made from several layers of chips, ranging in efficiency from 7-13%. They can be classified into several types according to the material used in their manufacture, including amorphous silicon, cadmium telluride, selenide, copper, indium, gallium.