Which statement about perovskite-containing cells is true?

• A. Perovskite-only cells are no more efficient than silicon-based ones.
• B. Perovskite alone outperforms silicon in all conditions.
• C. Perovskite reduces production costs without affecting efficiency.
• D. Perovskite cannot be used with silicon.

Answer: (C)

The main idea this question tests is how perovskite materials can lower manufacturing costs while keeping performance high. Perovskite-containing cells can be produced with simpler, low-temperature, solution-based processes, which reduces the cost of making solar cells. At the same time, their electrical performance can be very strong—comparable to silicon in many cases, and even higher in tandem configurations that pair perovskite with silicon. That combination—cheaper production methods without sacrificing efficiency—is why the statement about cost reduction without hurting efficiency is considered true.

The other ideas don’t fit: perovskite technology has already shown efficiencies that can rival or exceed silicon in some lab results, so saying it’s not more efficient is inaccurate; perovskite’s performance isn’t guaranteed to be superior under all conditions due to stability and environmental sensitivity; and there are viable perovskite/silicon tandems, so the claim that perovskite cannot be used with silicon isn’t true.