Module Efficiency Progress Of TOPCon Technology

Reflecting its broad installed base and mainstream status, the TOPCon segment is the most dynamic cell technology stream, as also shown in our TOP SOLAR MODULES analysis. The TOPCon efficiency range continued to extend at the upper end, driven primarily by incremental efficiency upgrades. While the lower limit of the band remained unchanged at 22.1%, represented by CECEP, the upper boundary was raised multiple times by different companies. This reflects the ongoing optimization of commercially available TOPCon modules by various companies.

The best TOPCon efficiency has increased 6 times from January 2024 to December 2025. During H2 2025 alone, the top commercial TOPCon module efficiency improved 3 times and 0.5 percentage points in absolute terms, rising from 23.2% in June to 23.7% by December. The July level of 23.32%, as represented by JinkoSolar, is already an improvement over the previous month, followed by 23.51% in October. Then in November, Trinasolar reached an even higher level of 23.7%. In H1 2025, the upper limit was raised twice – first to 23% in March, and then to 23.2% in June – representing a 0.2% absolute gain within just half a year (see TOPCon: A Dominant Technology In TOP SOLAR MODULES).

The efficiency range for the TOPCon stream changed twice in 2024. The best TOPCon efficiency was 22.65% in January, improved to 22.8% in February, and then to 23% in November.

Over the 2-year period, the top efficiency has increased by 1.05% absolute. TOPCon commercial module efficiencies range from 22.1% to 23.7%, representing the minimum and maximum levels, respectively, with a spread of 1.6%.

A key technology milestone was reached in October 2025, when JinkoSolar increased the efficiency of its TOPCon module to 23.51%, marking the first time a commercial TOPCon module surpassed the HJT benchmark of 23.5%. It is also the first time that TOPCon has surpassed the 23.5% efficiency benchmark. This has positioned TOPCon at the high end of the commercial efficiency spectrum. In the very next month, Trinasolar raised the bar again by commercializing a module with 23.7%, the highest level reported for TOPCon technology so far in the TOP SOLAR MODULES listing. JinkoSolar’s latest TOPCon modules featured in the December editions marginally miss the title of ‘highest’ efficiency, with 23.69% (see Product Shares Of Different Cell Technologies).

While these changes are significant, this period also represented several incremental changes. In July 2025, JinkoSolar increased the efficiency of its TOPCon module from 22.65% to 23.32%. In the same month, Astronergy further raised its TOPCon module efficiency from 23.0% to 23.1%. While not a true performance improvement, Yingli rounded off the efficiency level of its TOPCon module in August from 22.36% to 22.4%. In September, Astronergy improved its TOPCon module efficiency from 23.1% to 23.3%, while JA Solar raised its module efficiency from 23.2% to 23.3%, further extending the upper efficiency range. In addition, DAS Solar upgraded its module from 22.5% to 23.1%, moving into the higher-efficiency range. The month also saw the entry of DAH Solar, which joined the TOP SOLAR MODULES listing with a TOPCon module rated at 23.02% efficiency.

In October, in addition to JinkoSolar’s new high of 23.51%, both DMEGC Solar and JA Solar raised their respective module efficiencies to 23.5%, while Trinasolar improved its TOPCon module from 23% to 23.2%. Canadian Solar also recorded an intra-band upgrade from 22.5% to 22.6%. While there was only one change in November, it was significant: as mentioned above, Trinasolar improved the efficiency of its TOPCon range to 23.7%, the highest level for the technology today. The year concluded with notable TOPCon improvements in December 2025. JinkoSolar further increased the efficiency of its TOPCon module from 23.51% to 23.69%. The 23.51% efficiency level previously held by JinkoSolar is now held by Astronergy, which increased its efficiency from 23.3%. GCL SI also made a significant leap, improving the efficiency of its TOPCon modules from 22.53% to 23.5%. Jolywood, one of the early adopters of TOPCon technology, after a gap of more than 2 years, updated the commercialization details of its latest product with an efficiency of 23.2%.

TOPCon was also the most active technology in terms of efficiency upgrades in the first half of 2025. The most prominent change was JA Solar’s commercialization of a TOPCon module with 23.2% efficiency – a new benchmark for the technology in the commercial space at the time, achieved in June 2025. Among earlier developments, Trinasolar improved the top efficiency of its commercial TOPCon modules by 0.5% absolute, from 22.5% to 23% in May. In March, 2 other companies also made notable gains – DMEGC Solar increased its product efficiency from 22.8% to 23%, while Astronergy raised the top efficiency of its commercial TOPCon module from 22.9% to 23%.

As for 2024, in January, the TOPCon section was led by JinkoSolar’s 21.65% module, a position it had held since September 2022. Astronergy’s TOPCon module also shared this spot with the same efficiency. Among the major changes in January, DMEGC Solar joined in at the 22.5% level, improving its TOPCon module’s efficiency by 0.05% absolute to 22.5% from 22.45%. With this addition, the count of TOPCon products listed at this level increased to 7. In February, Tongwei Solar raised the bar to 22.8%, breaking JinkoSolar’s 22.65% barrier set over a year ago. In March, Astronergy’s best TOPCon module also reached the same level, jumping from its previous highest level of 22.65%. DMEGC Solar also improved its module’s best efficiency to 22.6% from 22.5%.

In May, there were 2 changes in the TOPCon section for TOP SOLAR MODULES: EGING PV improved the efficiency from 22.45% to 22.5%, and Kalyon’s TOPCon module entered our list with an efficiency of 22.38%. While there was no change in June, July saw a further increase in TOPCon efficiency level to 22.8%, attained by JA Solar’s product. The next 3 months saw no activity in the TOPCon section, but 3 changes took place in November. First, the top efficiency increased once again, this time by JA Solar, to the 23% milestone. This was followed by Astronergy tuning its best commercial TOPCon module efficiency by 0.1% absolute to 22.9%. The third change was from SolarSpace, which increased the efficiency of its best TOPCon product from 22.45% to 22.65%. These figures continued into December unchanged.

 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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