solar
TOPCon
Also known as: Tunnel Oxide Passivated Contact
Solar cell architecture using a tunnel oxide layer to passivate rear contacts — the dominant cell technology in 2026.
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%.
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