What is N-Type Silicon?
Silicon doped with phosphorus, used in modern high-efficiency cells with lower degradation than P-type.
Quick Answer
Most premium and mainstream panels sold in the UK in 2026 are N-type. The shift from P-type PERC to N-type TOPCon and HJT is the biggest recent change in the residential market, bringing higher efficiency and better long-term performance to UK roofs.
Fact-checked by John Rooney, Solar Energy Editor. Editorial policy
N-Type Silicon Explained
N-type silicon is doped with phosphorus, giving it a surplus of electrons (negative charge carriers). Compared with older P-type silicon, N-type is free of the boron-oxygen defects that cause light-induced degradation, so N-type panels lose less output over their life and have lower first-year degradation. N-type is the basis for all the leading modern cell technologies: TOPCon, HJT, IBC, ABC and HPBC. It costs slightly more to produce but delivers higher efficiency and longevity.
How Does N-Type Silicon Work in the UK?
Most premium and mainstream panels sold in the UK in 2026 are N-type. The shift from P-type PERC to N-type TOPCon and HJT is the biggest recent change in the residential market, bringing higher efficiency and better long-term performance to UK roofs.
Frequently Asked Questions
What is the difference between N-type and P-type solar panels?
N-type silicon is doped with phosphorus and P-type with boron. N-type avoids the boron-oxygen defects that cause light-induced degradation in P-type, so N-type panels degrade less, perform better in low light, and reach higher efficiency. Most modern premium and mainstream panels are N-type.
Are N-type solar panels worth it?
For most UK buyers, yes. N-type panels (TOPCon, HJT, IBC) offer higher efficiency and lower degradation than older P-type PERC panels, often for a modest price difference. They retain more of their output over a 25-year-plus life.
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John Rooney is the founder of Solar Info and has been covering the UK solar energy market since 2023. He researches every battery and inverter brand against manufacturer datasheets, MCS and Ofgem data, and feedback from the MCS-certified installers in our directory before publishing.