News frame
A rear ultra-thin polysilicon passivation layer pushed TOPCon open-circuit voltage above 730 mV in 2026, helping leading lines pass 26.5% cells. This edition treats the item as a dated industry update and separates reported observations from forward-looking interpretation.
The item is reported as an industry development; the supplied brief does not establish that it is a universal market rule or a NEUTRON product claim.
What is confirmed
Double-sided poly adds a thin polysilicon passivation layer on the cell rear, suppressing recombination and raising open-circuit voltage. Combined with LECO, it enabled open-circuit voltage above 730 mV and helped some production cells exceed 26.5% efficiency.
The figures above should be read as the values stated in the supplied brief. They are not presented as a universal benchmark, a guaranteed product specification, or a rule that applies outside the stated test or procurement context.
Technical and commercial context
The approach reduces the rear-side passivation yield challenge that had limited TOPCon scale-up, improving bankability. It is a key reason the record-to-production gap shrank to about 1.5 points in 2026. Poly passivation pairs with thin wafers and 0BB to form the 2026 high-efficiency TOPCon recipe.
The change matters because it connects a technical metric with a decision made downstream. A record result can affect qualification priorities; a manufacturing change can affect yield and traceability; and a control strategy can affect the evidence required for grid or customer acceptance.
What remains conditional
Several boundaries remain material: measurement method, sample size, test duration, product format, climate, operating profile, and the date on which the claim was made. Where the supplied brief does not state one of these boundaries, this article leaves the claim conditional rather than filling the gap with an inferred number.
The article also avoids turning an individual company announcement into an industry-wide conclusion. Buyers should compare the stated value with the applicable datasheet, tender language, standard, and acceptance test before changing a design or purchase decision.
Why this matters for project teams
For an engineering or procurement team, the useful question is whether the claimed cell or module improvement changes electrical design, thermal margins, mechanical loading, or the evidence required at acceptance.
In NEUTRON's content boundary, the news is useful as planning context for protection, distribution, and system integration work. It does not certify a component, approve a project, or replace a product-specific calculation.
Outlook
The new technology theme is likely to remain active through 2027 as more projects publish test conditions and buyers ask for repeatable evidence. The next useful update will be a dated result with a named method, a defined sample or operating envelope, and a clear distinction between demonstration, pilot production, and routine commercial delivery.
Until that evidence is available, the appropriate editorial status is monitored news: suitable for an industry update, with final publication still subject to media, route, and release checks.
Frequently asked questions
What is double-sided poly in TOPCon?
Double-sided poly adds a thin polysilicon passivation layer on the cell rear, suppressing recombination and raising open-circuit voltage. The answer depends on the stated test method, product format, and date; this update does not extend the claim beyond those boundaries.
Why does passivation raise voltage?
Combined with LECO, it enabled open-circuit voltage above 730 mV and helped some production cells exceed 26.5% efficiency. The answer depends on the stated test method, product format, and date; this update does not extend the claim beyond those boundaries.
Does poly passivation affect yield?
The approach reduces the rear-side passivation yield challenge that had limited TOPCon scale-up, improving bankability. The answer depends on the stated test method, product format, and date; this update does not extend the claim beyond those boundaries.
What should a buyer verify before acting on this news?
Verify the event date, measurement method, product or project scope, applicable standard, and the acceptance evidence required by the contract. Do not treat an industry update as a substitute for a model datasheet or project calculation.
Use the news as a project input, then verify the scope.
This News item is editorial context. Confirm the final datasheet, applicable standard, project conditions and acceptance evidence before changing a design or purchase decision.
Discuss a project implication