Monocrystalline silicon solar cells are mainly made of monocrystalline silicon. Compared with other types of solar cells, monocrystalline silicon cells have high conversion power Z. At the initial stage, monocrystalline silicon solar cells occupied most of the market share. After 1998, monocrystalline silicon solar cells retreated to polycrystalline silicon, and the market share occupied the second place. Due to the shortage of polysilicon materials in recent years, the market share of monocrystalline silicon increased slightly after 2004. Now, monocrystalline silicon is the majority of batteries in the market.
The silicon junction crystal of monocrystalline silicon solar cells is perfect, and its optical, electrical and mechanical properties are very uniform. The color of the cells is mostly black or dark, which is particularly suitable for cutting into small pieces to make small consumer products. The conversion power of monocrystalline silicon cells is 24.7% in the laboratory Generally, the commercialized conversion power is 10%-18%. Due to the manufacturing process problems of monocrystalline silicon solar cells, generally the semi-finished silicon ingots are cylindrical, and then the finished products are made by slicing – > cleaning – > diffusion bonding – > removal of back electrode – > manufacturing electrode – > corrosion of surrounding – > evaporation of antireflection film. Generally, the four corners of monocrystalline silicon solar cells are rounded corners.
The thickness of monocrystalline silicon solar cells is generally 200um-350um. The current production trend is to be ultra-thin and efficient.
When manufacturing polycrystalline silicon solar cells, the high-purity silicon as the material is not purified into single crystals, but melted and cast into square silicon ingots, and then cut into thin slices and perform similar processing like monocrystalline silicon. Polycrystalline silicon can be easily identified from its appearance. The silicon wafer is composed of many crystal regions of different sizes (with crystal shape on the surface), and its power generation mechanism is the same as that of single crystal. However, since the silicon wafer is composed of multiple crystal groups of different sizes and orientations, the photoelectric conversion at the grain interface is easily disturbed, so the conversion efficiency of polycrystalline silicon is relatively low. Together, the optical The consistency of electrical and mechanical properties is not as good as that of monocrystalline silicon solar cells. In the polycrystalline silicon solar cell laboratory, the high power of Z reaches 20.3%, and the commercialized ones are generally 10%-16%. The polycrystalline silicon solar cells are square pieces. When manufacturing solar modules, Z has a high filling rate, and the products are relatively beautiful.
The thickness of polycrystalline silicon solar cells is generally 220um-300um. Some manufacturers have already produced 180um thick solar cells and are developing towards thin, so as to save valuable silicon materials.
The common multi chip in the market is a square or rectangle with right angles. The four corners of the single crystal have chamfers close to the circle. The single crystal with a money shaped hole in the center of a component can be seen at a glance. Solar panel
HuanQi Solar
HuanQi Technology (Shenzhen) Co., Ltd.
