HJT’s top commercial efficiency increased by 0.48 percentage points over the last 2 years
The upper bound of HJT efficiency improved to 23.5%, and the lowest was fixed at 21.8%
Huasun led the HJT category throughout the review period, setting the top efficiency benchmark at 23.5%
Heterojunction technology (HJT) has been one of the key high-efficiency cell architectures tracked in the TOP SOLAR MODULES listing. The efficiency range for HJT has been steadily progressing over the past 2 years, with 2 notable increases in its upper limit and no changes to its lower limit. As in BC, the progress in HJT top efficiency has been spearheaded by one company, the pioneer of the technology, Huasun Energy. Even the lower limit, which has not changed from Meyer Burger’s 21.8%, remains unchanged over the last 2 years. No changes were recorded in the HJT stream during the second half of 2025. However, in the first half of the year, there was a milestone. In June 2025, the highest HJT efficiency rose from 23.18% to a new peak of 23.5%, representing an absolute improvement of 0.32%. This is the highest recorded for HJT in commercial listings to date. As for 2024, the top efficiency increased from 23.02% at the beginning of the year to 23.18% in August, which remained the highest for HJT for the rest of the year.
Over the last 2 years, the top efficiency has improved by 0.48% absolute, and the efficiency delta between the best and starting efficiency levels for HJT remained high at 1.7% absolute.
Moving to the product-level details, Huasun remained the leader in the segment with its HJT module at 23.5%, a level it attained in June. The only change in the second half of 2025 was that Risen also provided proof of commercialization for its Hyper-ion series in December with an efficiency of 22.5%, sharing the HJT top position with Huasun.
In H1 2025, Akcome’s HJT module was removed from the list in January 2025, reducing the product count from 9 to 8. On a positive note, the HJT stream recorded its most recent and significant gain in top efficiency in this period. Huasun retained its leadership as the top supplier of HJT products, holding the highest efficiency position for the past 2 years. In June 2025, Huasun raised the benchmark to 23.5%, as mentioned above. Another notable update in H1 2025 was the entry of Jetion Solar, which joined the TOP SOLAR MODULES listing in June with a 22.9%-efficient HJT module, expanding the technology’s representation.
At the beginning of 2024, Huasun’s module had a rated efficiency of 23.02%. Then in August, the company improved the efficiency of its top HJT commercial offering to 23.18%. Tongwei Solar took 2nd place, with a slightly lower efficiency of 23% throughout the year. The first change in 2024 was the delisting of a 22.5% efficiency module from Canadian Solar (CSI), leaving the efficiency level solely to Risen. Then in July, REC commercialized its latest Alpha Pure-RX with an improved efficiency of 22.6%, replacing the previous 22.3% product. The last change to this technology stream for the year was in October, when China-based Grand Sunergy debuted on the list, providing proof of commercialization for its 22.86% HJT module. The products that remained unaltered during 2024 were URECO’s 22.44% module, the 22.37% product from Akcome, Jinergy’s 21.85% module, and the 21.8% efficiency HJT module from Meyer Burger.
The text is an edited excerpt from TaiyangNews’ latest TOP SOLAR MODULES Report 2025, which can be downloaded for free here.
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