Chinese Researchers Build 33.33%-efficient Perovskite-Silicon Tandem Solar Cell via New Passivation Strategy

Why It Matters

The achievement pushes tandem solar‑cell efficiencies beyond 33 %, narrowing the gap to theoretical limits and signaling a commercially viable route for high‑yield photovoltaics. Its manufacturing‑friendly passivation could accelerate large‑scale deployment, reshaping the renewable‑energy market.

Key Takeaways

• 33.33% peak efficiency, 32.89% certified for 1 cm² tandem cell
• Peak‑selective passivation uses polystyrene nanospheres and Al₂O₃ on silicon pyramids
• Process compatible with existing silicon manufacturing, no lithography required
• Device retains ~90% efficiency after 1,000 hours continuous operation
• Passivation improves perovskite coverage, reduces recombination, boosts stability

Pulse Analysis

The race for solar‑cell efficiencies has long been dominated by perovskite‑silicon tandems, which combine the low‑cost, mature silicon platform with the high‑absorption potential of perovskites. In May 2026, a research team led by the Chinese Academy of Sciences reported a record‑breaking 33.33 % peak power conversion efficiency on a 1 cm² device, with a certified 32.89 % result. This performance surpasses the previous bests for tandem architectures and narrows the gap to the theoretical Shockley‑Queisser limit for multi‑junction cells, drawing immediate attention from both academia and industry.

The breakthrough stems from a peak‑selective passivation (PSP) technique that deposits a thin Al₂O₃ layer only on the apexes of the pyramid‑textured silicon substrate. Polystyrene nanospheres act as a sacrificial mask, enabling self‑aligned patterning without photolithography. The Al₂O₃ coating isolates high‑curvature regions, suppresses electric‑field concentration, and prevents shunting, while its weak interaction with the underlying SAM preserves surface chemistry for perovskite nucleation. The result is a pinhole‑free, conformal perovskite film that delivers superior carrier transport and markedly lower non‑radiative recombination.

Beyond the laboratory, the PSP approach is deliberately designed for integration into existing silicon‑cell production lines, requiring no changes to the bottom‑cell process flow. Its low‑cost, scalable nature could accelerate commercial rollout of tandem modules that combine >30 % efficiency with the durability demonstrated by a 1,000‑hour stability test retaining 90 % of initial output. Investors and manufacturers are likely to view this as a viable path toward next‑generation photovoltaic farms, where higher energy yield per acre translates into faster payback periods and stronger ESG credentials.