Silicon is the best solar cell material, which is the main reason for the silicon-based solar cells. Monocrystalline silicon cells in the above battery conversion efficiency is the highest, the most mature technology, photoelectric conversion efficiency of up to 23.3%. In the production process, the general use of surface texture, launch area passivation, doping and other technologies. However, due to the price of monocrystalline silicon material and the corresponding tedious process, the cost of monocrystalline silicon is so high that it is very difficult to substantially reduce the cost and can not achieve the large-scale popularization of solar power.
With the continuous development of new materials and the development of related technologies, solar cells based on other materials are also increasingly showing attractive prospects. At present, the research on international low-cost large-scale production technology mainly focuses on the manufacturing technology of polycrystalline silicon, large-area thin film amorphous silicon, CdTe cell and CIS cell, III-V compound semiconductor high efficiency photovoltaic cell, amorphous silicon and crystalline silicon hybrid thin film photovoltaic cell etc.
If we say that the characteristics of silicon is high efficiency, high cost, other materials, the problem is undoubtedly the battery low cost, conversion is weak. Compared with monocrystalline silicon solar cells, in addition to polysilicon, cadmium telluride, etc., other materials, the photoelectric conversion efficiency of the battery generally not more than 15%.