Perovskite silicon tandem cells reach stunning 28.39%

In a significant milestone for next-generation photovoltaic technology, Tongwei Solar has set a new efficiency record of 28.39% for its perovskite-silicon tandem solar cells. The breakthrough, which was independently certified by Germany’s prestigious Institute for Solar Energy Research Hamelin (ISFH), represents a crucial step in bridging the gap between laboratory research and industrial-scale production.

This achievement is particularly noteworthy because it was demonstrated on full-size cells manufactured on the company’s fully automated, MW-scale pilot production line. Unlike smaller, lab-based R&D cells—where Tongwei has previously reported efficiencies as high as 34.78%—this new record showcases the technology’s potential for commercial viability. The completion of the pilot line marks a critical transition toward making high-efficiency tandem modules a market reality.

Tandem solar cells represent a powerful evolution in photovoltaics. By layering a perovskite material on top of a conventional silicon base, these cells can capture a wider portion of the solar spectrum than either material could alone. The perovskite layer efficiently converts high-energy blue light, while the silicon layer captures lower-energy red and infrared light. This synergistic approach allows tandem cells to overcome the theoretical efficiency limitations of traditional single-junction silicon cells, which dominate the current market.

While challenges related to long-term stability and cost-effective manufacturing remain for the broader industry, Tongwei’s success on a pilot production line is a strong indicator of progress. This advancement in harnessing the combined power of perovskite and silicon materials paves the way for solar panels that can generate significantly more electricity from the same surface area, promising to lower the cost of renewable energy and accelerate the global energy transition.

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