Key Findings
Yingfa Ruineng, a Chinese solar cell manufacturer, has unveiled an innovative perovskite/back-contact (BC) tandem solar module that integrates high-performance BC cells produced by its subsidiary as the bottom cell. This large-format module, measuring 2.384m × 1.134m, achieves an impressive 26.78% conversion efficiency and a power output of 724W. This accomplishment represents a significant milestone in scaling up perovskite technology, enhancing its efficiency, and integrating it with existing silicon technology, marking a substantial step towards the commercialization of next-generation solar cells.
Technical Details
Yingfa Ruineng employs a 4-terminal (4T) tandem architecture. In this design, a transparent perovskite solar cell is positioned at the top, absorbing short-wavelength sunlight to generate electricity. Below it, a BC silicon solar cell developed by Yingfa’s subsidiary absorbs longer-wavelength sunlight. A key advantage of the 4T structure is the ability to independently optimize and perform maximum power point tracking (MPPT) for both the top and bottom cells, thereby maximizing overall power generation efficiency. In this module, the perovskite top cell accounts for over half of the total power output, demonstrating the high potential of perovskite technology. Maintaining high efficiency in a large-format module is attributed to uniform perovskite film deposition techniques, suppression of interface defects, and the development of efficient charge transport layers.
Background & Context
As the efficiency limits of conventional silicon solar cells are approached, perovskite-silicon tandem solar cells are considered the most promising technology for achieving higher power conversion efficiencies. BC cells, in particular, maximize light absorption area by eliminating metal grids on the cell surface, offering a high-efficiency approach among existing silicon technologies. The success of a Chinese company like Yingfa Ruineng in scaling up such high-efficiency tandem modules indicates China’s sustained and strengthening technological leadership in the global solar power market. This technology is expected to see widespread adoption in residential, commercial, and utility-scale power plants, accelerating the deployment of renewable energy.
Strategic Significance & Outlook
Yingfa Ruineng’s large-format perovskite/BC tandem module is now at a crucial stage for mass production and market introduction. The high efficiency of 26.78% and high output of 724W will improve the cost-performance ratio of solar power systems and maximize power generation per unit area. In the future, it is anticipated that the integration of this technology into existing silicon solar cell manufacturing lines will further accelerate mass production. This breakthrough will be a significant step in establishing perovskite solar cells as a major player in the global energy mix. Particularly as the transition to a low-carbon society accelerates, such innovative solar cell technology will make a substantial contribution to energy sustainability.
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