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Considering the conversion efficiency, technical level, production process maturity, market share and other factors of solar cell modules, for large-scale grid-connected photovoltaic power stations, the commonly used modules can be roughly divided into crystalline silicon modules and amorphous silicon modules.Crystalline silicon components are divided into monocrystalline silicon and polysilicon.Amorphous silicon components are mainly thin film components.The following is a simple analysis of the conversion rate of various photovoltaic cell modules:

1. Monocrystalline silicon solar cell module

Single crystal battery module is a common high efficiency battery module in the market.The production process and technological breakthrough of the single crystal industry chain determine that it has a perfect lattice, can better absorb light, and has high conversion efficiency.For single crystal solar cell modules, lonji PERC high efficiency single crystal cell efficiency has broken 23%, the highest record in the world.The conversion efficiency of ordinary single crystal modules is more than 18%, which is the highest of all kinds of solar cells.

As the technology matures, the price of single-crystal components has become similar to that of polycrystals.Because monocrystal silicon is usually sealed with toughened glass and waterproof resin, it is strong and durable, with a service life of 20 years and up to 30 years.

2, polysilicon solar cell module

Compared with the single crystal cell, the silicon wafer of the polycrystalline cell is a plurality of tiny single crystal combinations with a large number of grain boundaries in the middle, which contains many defects. It is actually a few sub-recombination center, thus reducing the conversion efficiency of the polycrystalline cell.At present, the efficiency of polycrystalline battery is about 16% on conventional battery line.

3, thin film solar cell module

After several years of rapid development, the laboratory efficiency of single-junction amorphous silicon thin film cells can reach about 12.7%, the laboratory efficiency of microcrystalline silicon multi-junction cells can reach 13.4%, the laboratory photoelectric conversion efficiency of CdTe thin film cells of cadmium telluride can reach 16%, and the average efficiency of commercial cells is 8-10%.The conversion efficiency of copper indium gallium selenium can reach 14%.

However, compared with crystalline silicon modules, the main problem of thin-film solar cell modules is the low efficiency of photoelectric conversion, and the large area of thin-film cell modules is required to convert the same amount of electricity.In addition, thin film battery modules also have the disadvantage of poor stability, and their energy conversion efficiency changes with the extension of irradiation time, which is the biggest obstacle to the wide application of thin film battery modules.

From the analysis of the conversion efficiency of the above three categories of photovoltaic modules, it is easy to see that the conversion efficiency of crystalline silicon modules is significantly higher and more stable than that of thin film modules.The monocrystalline silicon component has higher conversion efficiency and is more stable than polycrystalline silicon component.For the selection of photovoltaic power station module, the specific situation of the project should be combined with the corresponding technical and economic comparative analysis, and finally determine the best selection of photovoltaic power station battery module.