Advantages and disadvantages of thin-film solar cells
Because thin-film solar cells use less materials, the cost of each module is significantly reduced compared to stacked solar cells. The manufacturing process requires less energy than stacked solar cells. It also has The integrated connection module saves the cost of fixing and internal connection of the independent module. In the future, thin-film solar cells may replace the commonly used silicon solar cells and become the mainstream of the market.
The main difference between amorphous silicon solar cells and monocrystalline silicon solar cells or polycrystalline silicon solar cells is the difference in materials. The materials of monocrystalline silicon solar cells or polycrystalline silicon solar cells are sparse, while the material of amorphous silicon solar cells is SiH4. Because of the difference in materials, the structure of amorphous silicon solar cells is slightly different from that of crystalline silicon solar cells.
The biggest advantage of SiH4 is that it has good light absorption and light guiding effects, but its electrical properties are similar to insulators and are far from the semiconductor properties of silicon. Therefore, SiH4 was initially considered to be an unsuitable material. But in the 1970s, scientists overcame this problem, and RCA in the United States soon produced the first amorphous silicon solar cell. Although SiH4 has good light absorption and light guiding effects, its crystalline structure is worse than that of polycrystalline silicon solar cells, so the problem of floating bonds is more serious than that of polycrystalline silicon solar cells. The rate of recombination of free electrons and holes is very fast; in addition, the crystalline structure of SiH4 Irregularities hinder the movement of electrons and holes and shorten the diffusion range.
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