Korean researchers extend the lifespan of perovskite solar cells

Summary

South Korean researchers at KIER developed a nickel oxide catalytic process to separate lithium ions from the hole-transporting layers of perovskite solar cells. As a result, the cells were able to retain 95% of their initial efficiency after a 1,000-hour test under conditions of 85 °C and 85% relative humidity.

Why it matters

Perovskite's chronic weakness—rapid degradation under heat and moisture—limits its practical lifespan to 2–10 years, compared to silicon's 25–30 years. This undermines the material's cost and flexibility advantages. A process that eliminates the root cause, lithium additives, without sacrificing conversion efficiency could be the missing piece for commercial perovskite and tandem modules, especially in hot and humid climates.

Highlights

• The NiOx catalyst physically adsorbs lithium ions; these ions are then removed via a simple filtration step. No chemical additives are required.
• The cells achieved an efficiency of 25.24%, slightly higher than the 25.21% efficiency of conventional additive-based cells.
• Only a 5% efficiency loss was observed during a 1,000-hour humidity-heat stress test at 85 °C / 85% relative humidity.

Critical take

While impressive in the lab, the 1,000-hour stress test represents a tiny fraction of the 200,000 hours that silicon panels must withstand. The article provides no data on scaling costs, cross-section reproducibility, or long-term stability beyond the test window. Furthermore, it is difficult to consider the claim of being 'slightly higher' meaningful, as the 0.03% efficiency difference compared to conventional cells falls within typical measurement uncertainty limits.