News frame
A reported 28.13% single-junction silicon result is treated as a dated industry update. The certification body, development party and test date are kept distinct.
The result is treated as an ISFH-certified record; it is not presented as a universal benchmark or a guaranteed commercial module specification.
What is confirmed
A back-contact heterojunction cell reached 28.13% certified single-junction silicon efficiency in April 2026, within 1.3 points of the stated theoretical limit. Commercial HJT cells were reported above 26.8% certified, with about 750 mV open-circuit voltage.
Technical and commercial context
Reported HJT improvements included silver consumption below 50 mg/W and wafer thickness of 100–110 micrometers. A reported 740 W bifacial module at 23.8% illustrates a premium utility path, while the low temperature coefficient remains relevant in hot climates.
The record affects qualification priorities, but it does not remove the need to compare module format, test method, thermal behavior and acceptance evidence.
What remains conditional
Measurement method, sample size, test duration, product format and the date of the claim remain material. The certification result should not be merged with company capacity targets or treated as proof of routine production.
Buyers should compare any commercial offer with the approved datasheet and applicable standard before changing a design or procurement decision.
Why this matters for project teams
For engineering and procurement teams, the practical question is whether the claimed efficiency and temperature behavior change electrical design, thermal margins, mechanical loading or the evidence required at acceptance.
This News item is planning context for protection, distribution and system integration work. It does not certify a component or replace a project calculation.
Outlook
The next useful update will pair a dated result with a named method, defined sample and clear distinction between demonstration, pilot production and routine commercial delivery.
Frequently asked questions
What is the difference between HJT and HIBC?
HIBC combines heterojunction layers with rear-contact architecture. The reported 28.13% figure is an ISFH-certified single-junction silicon result; it should not be read as a universal commercial module rating.
Why does HJT cost more than TOPCon?
The answer depends on silver use, wafer thickness, equipment, yield and product format. The update reports cost-gap improvements but does not establish a single market-wide cost comparison.
What should a buyer verify?
Verify the certification body, event date, test method, product format and acceptance evidence before using the record in procurement.
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