The premium line,
measured in heat.
Heterojunction cells stack thin amorphous-silicon layers onto a crystalline wafer, giving HJT the market's lowest temperature coefficient — −0.24 to −0.26%/°C — and a near-symmetric structure with ≥85–90% bifaciality. That combination is why 700 W-class HJT modules already reach 23.66% efficiency, and why hot-climate buyers pay the premium.
| Pmax | 710 W |
|---|---|
| Efficiency | 23.5% |
| Dimensions | 2384×1303 mm |
| Warranty | 15 / 30 yr |
Two silicon worlds in one cell
An HJT cell sandwiches a crystalline silicon wafer between thin amorphous-silicon layers. The junction forms at the interface, so the cell needs no high-temperature doping — the result is a symmetric, passivated structure that degrades slowly and loses less output as the module heats up. Buyers feel it in three numbers:
- −0.24 to −0.26%/°C — the market's lowest temperature coefficient; on a 45 °C desert noon an HJT module holds more of its rated power than any mainstream N-type line
- ≥85–90% bifaciality — the near-symmetric cell collects rear light on white sand, snow and tracker sites
- 0.4%/yr linear degradation — suppressed LID/LeTID keeps output on the 30-year curve to 87.4% at year 30
In 2025 the world shipped 536 GW of modules and consolidation favored premium N-type capacity — HJT is the line to pair with TOPCon volume when your site runs hot.
Two power classes, one cell platform
400–430 W rooftop formats and 690–730 W utility formats, all half-cut dual-glass with multi-busbar stringing and ≥85% bifaciality.
| Model | Pmax | Efficiency | Dimensions | Weight | Bifaciality | Format |
|---|---|---|---|---|---|---|
| EMS-400H-108 | 400 W | 22.6% | 1762×1134 mm | 21.0 kg | ≥85% | 54-cell rooftop |
| EMS-405H-108 | 405 W | 22.8% | 1762×1134 mm | 21.0 kg | ≥85% | 54-cell rooftop |
| EMS-410H-108 | 410 W | 22.9% | 1762×1134 mm | 21.2 kg | ≥85% | 54-cell rooftop |
| EMS-415H-108 | 415 W | 23.0% | 1762×1134 mm | 21.2 kg | ≥85% | 54-cell rooftop |
| EMS-420H-108 | 420 W | 23.1% | 1762×1134 mm | 21.4 kg | ≥85% | 54-cell rooftop |
| EMS-425H-108 | 425 W | 23.2% | 1762×1134 mm | 21.5 kg | ≥85% | 54-cell rooftop |
| EMS-430H-108 | 430 W | 23.2% | 1762×1134 mm | 21.6 kg | ≥85% | 54-cell rooftop |
| EMS-690H-132 | 690 W | 23.2% | 2384×1303 mm | 33.0 kg | ≥90% | 66-cell utility |
| EMS-700H-132 | 700 W | 23.4% | 2384×1303 mm | 33.2 kg | ≥90% | 66-cell utility |
| EMS-710H-132 | 710 W | 23.5% | 2384×1303 mm | 33.5 kg | ≥90% | 66-cell utility |
| EMS-720H-132 | 720 W | 23.7% | 2384×1303 mm | 33.8 kg | ≥90% | 66-cell utility |
| EMS-730H-132 | 730 W | 23.9% | 2384×1303 mm | 34.0 kg | ≥90% | 66-cell utility |
All values at STC, ±3% Pmax tolerance. 2.0+2.0 mm dual-glass, half-cut, SMBB; snow load 5400 Pa / wind load 2400 Pa.
Three numbers importers quote back to us
−0.24%/°C
The market's lowest temperature coefficient. On a 45 °C desert noon, HJT holds roughly 0.05%/°C more output than a mainstream N-type module — real kWh at peak prices.
≥85–90%
Near-symmetric HJT cells capture rear light. On white sand or elevated tracker mounts, the rear side contributes measurable yield on top of the front rating.
USD 39/MWh LCOE
Global utility LCOE sits near USD 39/MWh in 2025 and is forecast to fall ~30% by 2035 — every yield point counts, and hot-climate projects earn HJT's advantage.
Where the heat advantage pays
Desert utility
White-sand albedo plus 45 °C+ summers — HJT's temperature behavior and ≥85% bifaciality are built for these sites.
Humid tropics
High heat and humidity year-round; the symmetric passivated stack resists humidity-driven degradation across a 30-year life.
Premium rooftop
400–430 W formats for feed-in and self-consumption projects where per-kWh yield matters more than first cost.
HJT + TOPCon mix
One PO, one container: HJT for premium sites, TOPCon for volume — mixed-container MOQ saves 2–5% vs separate shipments.
Before you send the RFQ
Answers to the four questions that decide an HJT order. The full 16-question FAQ covers MOQ, shipping and warranty terms.
Full FAQHow much more does HJT cost than TOPCon?
Which certificates ship with HJT modules?
Can I mix HJT and TOPCon in one container?
What warranty applies?
Spec your premium line today.
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