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Amorphous silicon (a-Si, which uses silicon but in a different form) solar cells are a type of thin-film cell. Although amorphous silicon thin-film solar cells have a lower conversion efficiency than crystalline silicon solar cells (the conversion efficiency of commercial amorphous silicon thin-film cells is around 4-6%, which is lower than the 16-18% efficiency of crystalline silicon cells), they also suffer from the drawback of photoinduced degradation. However, it has the advantages of high efficiency and low cost. Compared with crystalline silicon solar cells, the advantages of amorphous silicon solar cells are mainly reflected in the following aspects: (1) less material is required, resulting in lower manufacturing costs. Silicon-based thin-film cells have a thickness of less than 1 micron, which is less than 1/100 of the thickness of crystalline silicon cells, **reducing material costs ； (2) Silicon-based thin-film cells utilize low-temperature processing techniques, which not only helps to save energy and reduce consumption but also facilitates the use of inexpensive substrates such as glass and stainless steel ； (3) Silicon-based thin films are deposited by the decomposition of gases through glow discharge; by changing the composition of the reactive gases, various silicon-based thin film materials can be easily fabricated, enabling the creation of batteries with various stacked structures and reducing the number of processing steps required. (4) Due to the irregular arrangement of atoms in amorphous silicon, it has more opportunities to interact with photons; therefore, its light absorption capacity is greater than that of crystalline silicon. It has less stringent requirements regarding light intensity, exhibits a better response to weak light, and can still function in rainy weather. (5) The substrate can be made of flexible materials, which is suitable for large-scale production; it offers advantages in photovoltaic building integration (BIPV), is appropriate for long-distance transportation and installation, and holds great potential for development. It facilitates large-scale, fully automated continuous production. In 2006, the estimated global production of amorphous silicon solar cells was around 115 MW. Seven companies specializing in amorphous silicon solar cells – UNITEDSOLAR in the United States, KANAKE in Japan, RWE in Germany, TOPRAYSOLAR in China, INTERSOLAR in the United Kingdom, ICP in Canada, and FREEANEGER in France – accounted for 80% of the global supply in this sector, as well as 90% of the supply targeted at the high-end market