Trina Solar announces 907 W tandem solar module with 29.2% efficiency

Chinese PV manufacturer Trina Solar has unveiled a 907 W n-type TOPCon-perovskite tandem solar module.

According to the company, the module achieved a full-panel conversion efficiency of 29.2% in testing by Germany’s TÜV SÜD. The product is reportedly designed for mass production, rather than a laboratory-scale sample.

The module uses a two-terminal tandem cell architecture combining an n-type TOPCon crystalline silicon bottom device with a perovskite top cell. The design is intended to absorb a broader part of the solar spectrum than conventional single-junction silicon modules.

The module measures 2,384 mm by 1,303 mm and is based on 210 mm wafer technology. It incorporates large-area perovskite film deposition, tunnel recombination contact technology, and high-reliability encapsulation.

The company said its slot-die coating and vapor-assisted crystallization process improved film uniformity in large-area perovskite layers, while a composite indium tin oxide (ITO) tunneling layer wass used to reduce recombination losses between the top and bottom cells.

The panel also utilizes dual-layer co-extruded polyolefin elastomer (POE) encapsulation and a low water-vapor transmission backsheet, along with perovskite-specific sealing materials. According to Trinasolar, the product has passed International Electrotechnical Commission (IEC) 61215 and IEC 61730 reliability testing, including potential-induced degradation (PID), damp heat, thermal cycling, and ultraviolet (UV) aging tests.

Trinasolar said it plans to accelerate production of its perovskite-silicon tandem module line in 2026, though large-scale commercial shipments are expected to begin in 2028–2029, according to a recent investor communication.

In December, the manufacturer announced that an industrial-scale tandem solar cell using a 210 mm half-cut format achieved a certified power conversion efficiency of 32.6%, while a standard-size tandem module integrating the cells delivered a peak power output of 865 W. It said both results have been independently verified by European testing bodies and represent world-record performance for industrially relevant formats.

Trina Solar said the latest results build on a series of tandem milestones reported over the past two years, including certified tandem modules exceeding 800 W and tandem cell efficiencies above 31% on industrial wafer formats. The company claimed it has now created or broken global benchmarks in solar cell efficiency or module power output 37 times.