TOPCon Remains Mainstream As Optimization Pathways Continue

As TOPCon approaches higher levels of maturity, recent progress is increasingly centered on process refinement, material quality, and module-level integration

TOPCon remains the dominant solar cell technology, with ongoing improvements focused on passivation, metallization, and rear-side engineering.(Photo Credit: JinkoSolar)

Published on:

May 19, 2026, 12:32 pm

Key takeaways:

TaiyangNews’ report highlights TOPCon’s continued dominance in efficiency, deployment, and manufacturing capacity through 2030
Recent developments focus on contact formation, metallization, and rear-side design optimization
Wafer quality and specifications remain important as n-type substrates become standard across mainstream high-efficiency technologies

TOPCon, a workhorse of the current era, will maintain its position until the end of 2030, according to the China Photovoltaic Industry Association (CPIA) (see Projected Market Shares Of Different Solar Cell Technologies). The technology has set multiple efficiency benchmarks, achieved the highest deployment levels, and today represents the largest share of global manufacturing capacity. Despite being relatively mature, the technology still has some headroom for further optimization. The progress is a collective effort at the cell and module levels. Since module development is not exclusive to any cell technology, the TaiyangNews Cell & Module Technology Trends 2026 report covers recent developments in cells. These include refined passivation and contact formation, innovations in metallization, and rear-side design.

Wafers form the foundation of any cell manufacturing process, making it worthwhile to take note of developments at this level as well. With all mainstream high-efficiency technologies now based on n-type substrates, n-type wafers have become the industry standard. At the same time, wafer specifications are not uniform and vary with cell architecture. In this context, the requirements for TOPCon can be seen as sitting between HJT and BC in terms of material quality and process sensitivity.

While TaiyangNews covered wafer developments in detail in the Cell & Module Technology Trends 2025 report last year, including LONGi’s TaiRay wafer technology, there have been no major breakthroughs in this segment since. Instead, the focus remains on incremental improvements and tighter control over material quality. The key wafer parameters relevant for TOPCon have therefore remained largely unchanged over the past year.

The text is an edited excerpt from TaiyangNews’ latest report on Cell & Module Technologies Trends 2026, which can be downloaded for free here.

TOPCon Technology