Polycrystalline solar panels
The first solar panel based on polycrystalline silicon (also known as multicrystalline), were presented at the world market in 1981. Unlike solar panels, based on single crystals for the manufacture of polycrystalline solar panels do not need to use the Czochralski method. Raw silicon is melted and poured into a square mold, which is cooled and cut into perfect square plate.
- The method used for the production of polycrystalline silicon is more simple and less costly. The amount of silicon waste is less than the production of monocrystalline silicon.
- Polycrystalline solar panels tend to have slightly lower resistance to high temperatures than monocrystalline solar panel. Technically speaking, this means that they are a little worse at higher operating temperatures than monocrystalline solar panel. Heat can affect the performance of solar cells and reduce their lifespan. Although this effect is negligible, and most homeowners do not need to take it into account.
- Performance of solar panels based on polycrystalline usually is 14-18%. Due to the low purity polycrystalline silicon solar panels are not as efficient as a single crystal.
- The lower space efficiency. As a rule, you need to cover a large area, to obtain at the output of the same electrical power, as well as from single-crystal. However, this does not mean that the single-crystal panels work best polycrystalline.
- Polycrystalline panels outwardly look patchy. This is due to the presence of a plurality of crystals in one photocell. In recent years, it is possible to hide with the help of more advanced anti-reflective coatings.