Solar cells are a key component of solar panels, and their cost is a major factor in the overall price of a solar panel system. Solar cells are made of semiconductor materials like silicon, and they work by converting sunlight into electricity. nnThe cost of solar cells has fallen dramatically in recent years, thanks to advances in manufacturing technology. Today, it's possible to buy solar cells for as little as £0.50 per watt of capacity. That means that a 100-watt solar panel would cost around £50. nnSolar panels typically have an efficiency of around 15-20%, so a 100-watt panel would produce around 15-20 watts of power. The cost of installation and other factors will also affect the total price of a solar panel system, but the cost of the solar cells themselves is a good starting point for estimating the overall cost.