Monocrystalline solar cells are typically more expensive due to their what structural characteristic?

• A. Single-crystal silicon
• B. Lower efficiency
• C. Multicrystal formation
• D. Thinner wafers

Answer: (A)

The higher cost comes from using single-crystal silicon. Producing a single-crystal ingot requires precise, energy-intensive crystal growth (like the Czochralski process) and very pure silicon, which is slower and more complex than other methods. That single-crystal lattice yields fewer defects and no grain boundaries, giving higher efficiency and better performance, but the demanding manufacturing process and material quality push up the price. Polycrystalline (multicrystal) silicon is cheaper to make because the growth and slicing are simpler, even though it doesn’t perform as well in all conditions. Wafers being thinner is a design choice, not the main driver of the cost difference.