Risen Energy granted a new invention patent for heterojunction solar cells

Risen Energy Co., Ltd. has been granted a new invention patent for its heterojunction (HJT) solar cell technology, according to records published by the China National Intellectual Property Administration.

The patent, titled “A heterojunction cell, a method for preparing a heterojunction cell, and a photovoltaic module”, was granted on 15 September 2026 under publication number CN120640783B. The application (no. 2025107593222) was filed on 9 June 2025. The patent holder is Risen Energy Co., Ltd., and the named inventors are Zeng Zhigui, Zhu Longkai, Zhou Xiang, Ren Mingchong and Yang Bochuan.

What the patent covers

The invention relates to a heterojunction cell built on a silicon substrate with two opposing surfaces: a textured first surface and a polished second surface. Each surface carries, in order, an intrinsic amorphous silicon layer, a doped layer and a transparent conductive layer.

Both surfaces contain trace iron (Fe) and aluminium (Al) impurities, with the Fe/Al concentration on the textured surface higher than on the polished surface. In use, the polished surface is flatter, which helps the amorphous silicon film deposit evenly. Because the impurity content of the polished surface is far lower than that of the textured surface, the overall minority carrier lifetime rises and the polished surface passivates better — which is what ultimately lifts cell performance.

Where Risen’s HJT programme stands

In the first half of 2026 Risen Energy continued to lead in n-type heterojunction technology:

• Cell conversion efficiency has passed 27%, and module conversion efficiency has passed 24.70%.
• Hyper-ion Pro modules reach 740 W+ in mass production, with the best production batches averaging 26.4% cell efficiency.
• More than 12 GW of the series has shipped to over 80 countries and regions.
• In hot, high-albedo conditions Hyper-ion Pro delivers an energy gain of more than 6%, suiting growth markets such as the Middle East and South-East Asia.

In TaiyangNews’ TOP SOLAR MODULES listing, the Hyper-ion Pro heterojunction module placed Risen among the global top three and set the highest power figure the listing has recorded.

From the grid to orbit

Risen now runs two HJT tracks in parallel: n-type cells in mass production, and p-type cells for specialist applications. At SNEC in June 2026 the company launched Risen Flex Nova, a product for commercial space and other specialist uses. It is built on Risen’s own 70 μm ultra-thin flexible p-type HJT cell, with a beginning-of-life efficiency of 21% and up to 22.2% under the AM0 space spectrum. Risen plans gigawatt-scale mass production in 2027. Light weight, high radiation tolerance and high specific power position the product for the space-solar market, where barriers to entry and value are both high.

Next-generation cells and new capacity

On the technology roadmap, Risen’s perovskite–HJT tandem cell has passed 31.95% efficiency in the laboratory, building the core know-how for future modules with higher efficiency and power. The company says it will keep increasing investment in developing and industrialising frontier technologies led by heterojunction and perovskite.

Looking to the second half of the year, Risen’s advanced manufacturing capacity enters a period of concentrated ramp-up. Projects under way include 15 GW of n-type ultra-low-carbon high-efficiency HJT cells and 15 GW of high-efficiency modules a year in Ninghai, Zhejiang, and 4 GW of high-efficiency cells and 6 GW of high-efficiency modules in Jintan, Jiangsu. As the new lines come on stream, Risen’s scale advantage in HJT is expected to grow and non-silicon manufacturing costs to keep falling.

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Translated and adapted from a report published in Chinese by Mole PV (摩尔光伏) on 20 September 2026. Patent details are from the China National Intellectual Property Administration.