HJT achieved its highest efficiency to date in June 2025, with Huasun raising the top level from 23.18% to 23.5%, while the lower limit stayed at 21.8%
Akcome was delisted in January 2025, while Jetion Solar entered the list in June 2025 with a 22.9% module
By the end of June 2025, HJT was represented with a total of 9 modules in the TOP SOLAR MODULES listing
The TaiyangNews TOP SOLAR MODULES Analysis H1-2025 looked at the share of different cell technologies in the high-efficiency module segment. After covering technology shares in previous articles, the analysis now turns to efficiency developments, tracking how each technology has advanced over time. In the last article, the focus was on Back Contact (BC) technology, and here it is on Heterojunction (HJT) technology (see Back Contact Technology Development From 2023 To H1-2025).
The efficiency range for HJT has been steadily progressing over the past 2.5 years, with 3 notable increases in its upper limit and 1 revision to its lower limit during this period. In H1 2025, HJT modules recorded their most recent and largest gain in top efficiency. In June 2025, the highest HJT efficiency rose from 23.18% to a new peak of 23.5%, marking a 0.32% absolute improvement. The lower limit of the technology band, however, remained unchanged at 21.8%, a level maintained since September 2023.
In 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. In 2023, both the upper and lower limits improved simultaneously in September. While the top efficiency took a jump of close to 0.5% absolute from the year’s starting level of 22.53% to 23.02%, the lower limit was upped from 21.68% to 21.8%. As for the companies, Huasun retained its leadership as the top HJT product supplier, holding the highest efficiency position for the past 2.5 years. The latest advancement came in June 2025, when Huasun raised the benchmark by increasing its HJT module efficiency from 23.18% to 23.5% – the highest recorded for HJT in commercial listings to date. 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% efficiency HJT module, expanding the technology’s representation. In contrast, a significant delisting occurred in January 2025, when Akcome’s HJT module was removed from the list, reducing the product count from 9 to 8 (see Share Of HJT In TOP SOLAR MODULES).
At the beginning of 2024, a 23.02% efficiency module represented the company. Then in August, Huasun improved the efficiency of its top HJT commercial offering to 23.18%. Tongwei Solar took the 2nd position with a marginally lower 23% efficiency product 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 was in October when China-based Grand Sunergy debuted on the list by providing proof of commercialization for its 22.86% HJT module. The products that remained unaltered during the course of 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 that represented the lower limit for this stream.
The year 2023 also saw its share of HJT product developments. In April, Risen’s HJT module appeared in the TOP SOLAR MODULES listing for the first time, boasting an efficiency of 22.5% and matching CSI’s performance. URECO joined in August with a 22.44% efficiency module, and all 3 products remained unchanged through the year. Jinergy upgraded its module efficiency from 21.68% to 21.85% in September, pushing Meyer Burger’s product to represent the lower limit in this segment. That same month, Huasun set a new benchmark by commercializing its 23.02% efficiency module, surpassing the 23% threshold for the first time, which also earned it a place among the top 3 ranks in our list. Since then, Huasun’s HJT module continued to be among the top 3 TOP SOLAR MODULES till April 2024. With this product, Huasun realized a 0.49% jump in absolute efficiency at a stretch.
The last month of 2023 also featured 2 changes related to HJT. In December, Tongwei Solar entered the list with a 23% efficiency module, marginally lower than Huasun’s product. In the same month, Akcome also improved the efficiency of its HJT product from 22.22% to 22.37%. These advancements remained unaltered for the rest of the year. The 22.5% HJT module from CSI, REC’s 22.3% module, and the 21.8% module from Meyer Burger were 3 products that didn’t undergo any change in 2023.
This text is an edited excerpt from the TaiyangNews TOP SOLAR MODULES H1-2025 report, which can be downloaded for free here.