How to distinguish monocrystalline silicon cells and polycrystalline silicon cells?
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 monocrystalline silicon cells, polycrystalline silicon cells and amorphous silicon cells difference.
From the appearance of the above, the four corners of the single crystal silicon battery 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 The thin film component, which is not like a crystalline silicon cell, can be seen as a grid line, and the surface is as clear and smooth as a mirror.
Monocrystalline silicon cell
Polycrystalline silicon cell
Amorphous silicon cell
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 polysilicon, since monocrystalline 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. Filled with dissatisfaction; and polysilicon is square, so there is no such problem, their advantages and disadvantages are as follows:
Crystalline silicon components: Single block components have relatively high power. Under the same footprint, the installed capacity is higher than the film assembly. However, the components are heavy and brittle, the high temperature performance is poor, the poor 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 monocrystalline silicon 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 monocrystalline 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 suggest to choose more mature products of crystalline silicon photovoltaic modules according to the actual situation. For single crystals and polycrystals, there has been controversy. Our installers have little difference in the power generation of household photovoltaic power generation 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 power The photovoltaic system is consistent for the amount of electricity generated.