Among the options you provided, silicon is the commonly used material in solar cells. Silicon has become the dominant material for manufacturing photovoltaic (PV) solar cells due to its favorable properties for converting sunlight into electricity. Silicon solar cells are widely utilized in both residential and commercial applications.
While aluminum and copper are used in various electrical applications, they are not typically used as the primary material for solar cells. Germanium, on the other hand, has some niche applications in specialized types of solar cells, but it is not as commonly used as silicon.
It's worth noting that the field of solar cell technology is continuously evolving, and there are ongoing research and development efforts to explore alternative materials and technologies for more efficient and cost-effective solar energy conversion.
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