Yes, aluminum can be used to improve the efficiency of solar panels. Aluminum is lightweight, corrosion-resistant, and has good thermal conductivity, which can help in dissipating heat and maintaining optimal operating temperatures for solar cells. It is also used in the manufacturing of solar panel frames, providing structural support while reducing the overall weight of the panels. Additionally, some research suggests that using aluminum in the backsheet of solar panels can enhance their durability and efficiency. However, the extent of efficiency improvement depends on various factors, including the specific design and manufacturing process of the solar panels.