Passivated contact on the rear side
A tunnel oxide layer plus doped polysilicon cuts recombination at the rear surface. That is the physical reason for the efficiency jump over PERC — not a process tweak.
Technology
Why N-type, in numbers.
Passivated-contact TOPCon is not an incremental tweak on PERC: it changes the degradation curve and the high-temperature behavior, which is where real energy is lost.
| Parameter | MPM N-type TOPCon | Conventional PERC |
|---|---|---|
| Module efficiency | Up to 23.0% | 21.3% |
| First-year degradation | 1.0% | 2.0% |
| Annual degradation | 0.40% | 0.55% |
| Temperature coefficient Pmax | −0.29%/°C | −0.35%/°C |
| Bifaciality | Up to 80% | 70% |
| LID / LeTID | none | present |
| Low-light performance | superior | standard |
Values at STC. The PERC comparison uses market references for modules of equivalent format and power.
No light-induced degradation
The N-type substrate does not form the boron-oxygen defect that causes LID in P-type cells, and LeTID is absent as well. First-year power loss is half that of PERC.
Better high-temperature behavior
At −0.29%/°C against −0.35%/°C, a module running at 65 °C delivers roughly 2.4% more power than an equivalent PERC. On an unventilated roof, that gap runs all summer.
Bifacial gain
The Pro and Industrial series capture up to 80% of the irradiance reaching the rear face. Over light-colored roofing or gravel, real annual gain lands between 5% and 12%.
Distributors and installers
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