Energy solutions provider Qcells has achieved a world record of 28.6% efficiency in tandem solar cells on a full-area M10-sized cell (~0.36ft²) through its research and development (R&D) pilot line in Germany.
The milestone, verified by CalLab at the Fraunhofer Institute for Solar Energy Systems, advances perovskite-silicon tandem technology toward scalable solar solutions.
The innovation focuses on mass manufacturing using commercially viable processes, moving beyond laboratory-scale concepts.
Qcells’ tandem cells stack a perovskite top cell with Q.ANTUM silicon bottom cell technology to efficiently capture both high- and low-energy light. This design increases power output and reduces the number of modules and land area needed.
Commercialisation and R&D investment
Qcells global CTO Danielle Merfeld highlighted the breakthrough’s role in accelerating photovoltaic performance and driving solar energy efficiency. The champion cell was fabricated using processes feasible for large-scale production, laying the foundation for future commercialisation.
Qcells’ R&D efforts began in 2016, focusing on perovskite and silicon technology. The company intensified research at its Bitterfeld-Wolfen centre in Germany and Pangyo, Korea, with support from the German government, the EU, and the Korean government. These centres focus on large-area tandem development and national research initiatives.
Global collaboration and sustainability impact
The innovation reduces solar energy costs and land footprint, making solar power more affordable and sustainable.
The Bitterfeld-Wolfen Centre receives funding from German and European entities, while the Pangyo R&D centre benefits from Korean government support for tandem cell development.