In one line
Solar cell architecture using a tunnel oxide layer to passivate rear contacts — the dominant cell technology in 2026.
What it means
TOPCon (Tunnel Oxide Passivated Contact) is an n-type crystalline silicon cell architecture that uses a thin tunnel oxide layer on the rear side to reduce recombination losses. It captured 78% of new cell production capacity in 2026 with mass-production efficiency averaging 25.7%.
Related terms
Browse every term in the renewable energy glossary, or read the latest analysis on Solar PV.