# Nature Energy

China’s Researchers Push Kesterite Solar Cells Past 15% Efficiency, Narrowing Gap with Mainstream PV

Chinese scientists have pushed CZTSSe kesterite solar cells past 15% certified efficiency, a notable lab milestone for a thin‑film technology made from earth‑abundant, non‑toxic elements. The result strengthens the case for lower‑cost, widely deployable thin‑film photovoltaics but still faces scaling, stability and module‑level challenges before commercial impact can be judged.