Encapsulant chemistry determines PID resistance, moisture ingress rate and module life. N-type TOPCon needs POE — here's the 2026 buyer's guide.
N-type modules using POE
~78%
co-extrusion EVA/POE
Chinese EVA producers (top 3)
Hangzhou First, Sveck, HIUV
POE film FOB
$0.85/m²
May 2026
Why POE matters for N-type
N-type cells are more sensitive to sodium ion migration from the front glass. POE (polyolefin elastomer) has 30× lower moisture vapor transmission and no acetic acid byproduct — critical for keeping year-25 degradation below 12%. Traditional EVA is fine for P-type PERC but shortcuts a TOPCon module's life by ~3 years.
Frequently asked questions
QIs co-extrusion EVA/POE as good as pure POE?
Nearly — most tier-1 module makers now use POE on the rear side (cell side) and EVA on the outer sides for cost. Fully POE is only used in high-humidity utility installations.
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