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The difference between monocrystalline silicon and polycrystalline silicon photovoltaic modules


1. Difference in appearance and form


Monocrystalline silicon: the cell is square, rounded, dark blue;

Polysilicon: The cells are square in shape, sky blue.

2. Conversion rate difference:


Monocrystalline silicon: 16-18%, the highest conversion rate in the laboratory can reach 25%, high photoelectric conversion efficiency, high reliability, slightly higher power generation;


Polysilicon: 14-16%, the highest conversion rate in the laboratory can reach 20.4%, and the photoelectric conversion efficiency is slightly lower.


3. Comparison of monocrystalline and polycrystalline silicon cell industry chains


Comparison of single- and multi-crystalline silicon cell photovoltaic industry chain, from silicon materials to silicon rods, silicon wafers, cells, modules and systems. The difference between single crystal and polycrystalline mainly lies in the preparation of raw materials, and single crystal silicon is a direct pull lifting method.


Polysilicon is the predestined method, with only some nuances in the back-end manufacturing process.


4. Crystal quality difference


Monocrystalline silicon wafer is a complete lattice arrangement: multicrystalline silicon wafer, which is a combination of multiple tiny monocrystalline crystals, defective, impurities, thus reducing the conversion efficiency of polycrystalline cells. The combined effect of various factors makes monocrystalline silicon photovoltaic modules dozens of times higher than polysilicon, thereby showing the advantages of conversion efficiency.


5. Differences in electrical properties


Comparison of low birthrate lifetimes of monopolysilicon. Blue represents areas with a higher life expectancy and red represents areas with a lower birthrate. Obviously, the low birthrate lifetime of single crystals is significantly higher than that of polycrystals.