Which is better for monocrystalline and polycrystalline silicon solar panels?

- Jan 18, 2019-

Which is better for monocrystalline silicon solar panels and polycrystalline silicon solar panels? For this problem, everyone must have a deeper understanding, but for those who have just joined the photovoltaic industry, I think it is necessary to tell you about mono crystalline silicon cells, polycrystalline silicon cells and amorphous silicon cells the difference between the two.


The first solar cell was born in a single crystal silicon solar cell. Silicon is a very rich element on the earth. There are silicon everywhere. It can be said that it is inexhaustible. Silicon is used to make solar cells. The raw materials are not lacking. However, it is not easy to refine it. Therefore, while producing monocrystalline silicon solar cells, people have studied polycrystalline silicon solar cells. So far, commercial-scale solar cells have not jumped out of the silicon series. So how do you correctly distinguish between monocrystalline silicon, polycrystalline silicon and amorphous silicon cells?


First: the difference in appearance


From the appearance of the above, the four corners of the single crystal silicon cell are arc-shaped, the surface has no pattern; and the four corners of the polycrystalline silicon battery have a square angle, the surface has a pattern similar to ice; and the amorphous silicon battery is our usual Said thin film component, it is not like the crystalline silicon battery can be seen to the grid line, the surface is as clear and smooth as the mirror


Second: use the difference above


For the user, the single crystal silicon battery and the polycrystalline silicon battery are not much different, and their life and stability are good. Although the average conversion efficiency of single crystal silicon cells is about 1% higher than that of poly silicon, since mono-crystalline silicon cells can only be made into quasi-squares (four sides are arc-shaped), when forming solar panels, there will be a part of the area. Filling is not full; and poly silicon is square, so there is no such problem, their advantages and disadvantages are as follows:


Crystal silicon components: The power of a single block is relatively high. Under the same footprint, the installed capacity is higher than the film assembly. However, the components are thick and brittle, the high temperature performance is poor, the low light performance is poor, and the annual attenuation rate is high.


Thin film components: The power of a single block is relatively low. However, the power generation performance is high, the high temperature performance is good, the low light performance is good, the shadow blocking power loss is small, and the annual attenuation rate is low. The application environment is wide, beautiful and environmentally friendly.


Third: manufacturing process


The energy consumed in the manufacturing process of polycrystalline silicon solar cells is about 30% less than that of mono solar cells. Therefore, polycrystalline silicon solar cells account for a large share of the total global solar cell production, and the manufacturing cost is also lower than that of mono crystalline silicon cells. Therefore, the use of polycrystalline silicon solar cells will be more energy efficient and environmentally friendly!


In fact, there are many semiconductor materials available for manufacturing solar cells. With the development of the materials industry, the variety of solar cells will increase. At present, research and trial production of solar cells, in addition to the silicon series, there are many types of solar cells such as cadmium sulfide, gallium arsenide, copper indium selenium, etc., these materials are usually used to make amorphous silicon cells.


Therefore, when we choose PV modules, we recommend selecting more mature products of crystalline silicon PV modules according to actual conditions. For single crystals and poly crystals, there has been controversy. Our installers have little difference in the amount of power generated by household PV systems. The utilization area of single crystal will be relatively high, and the single crystal will be better in area utilization; the proportion of polycrystalline market is relatively high, the application is wider, and the price has certain advantages, but we must understand that for the same photovoltaic power system is consistent for the amount of electricity generated.