N-Type vs P-Type Solar Panels: Which Technology Wins in 2026?

The silicon wafer at the heart of a solar cell is doped to create an electric field. P-Type wafers use boron; N-Type wafers use phosphorus. That single change eliminates boron-oxygen light-induced degradation (LID) — the main reason conventional panels lose ~2% of output in their first year.

TopCon (Tunnel Oxide Passivated Contact) builds on the N-Type wafer with an ultra-thin oxide layer that reduces electron recombination, pushing module efficiency past 22.5% where mono PERC plateaus around 21.3%.

Heat is where N-Type quietly wins. With a temperature coefficient around -0.30%/°C versus -0.35%/°C for PERC, an N-Type array generates 2–3% more energy every summer afternoon when panel temperatures hit 60–70°C.

Bifacial N-Type dual-glass modules add another 5–30% from reflected light on elevated or ground-mounted structures, and carry 30-year performance warranties versus 25 for standard modules.

Verdict: for constrained rooftops, hot climates, or any system you plan to keep 10+ years, N-Type TopCon is the better engineering choice. For large, budget-driven arrays where space is unlimited, mono PERC half-cut remains excellent value.