by TongweiCN
Keep the world's largest solar cell business ahead on power per panel and cost per watt while the industry moves through a deep price slump.
TNC 3.0 (up to 770 W, 24.8%) debuted Jan 2026, launched at SNEC in June; global deliveries under way.
Updated 12 Aug 2026Checked 11 Oct0 updates this week
An ultra-thin oxide plus doped silicon on the back lets current out while stopping charges from recombining at the metal, the main loss in older cells.
Splitting each cell into four lowers the current in each piece, so less power is lost as heat in the wiring; Tongwei cites about 4 W per module.
Front, back and cut edges are coated to heal broken silicon bonds, so fewer charges are lost where the crystal ends.
With glass front and back, the panel also turns light reflected off the ground into power, up to 90% as well as the front face.
| Spec | TNC TOPCon cells and modules |
|---|---|
| TNC 3.0 module power (G12-66) | 770 WR (reported) |
| Module efficiency | Up to 24.8%R (reported) |
| Cell efficiency | Over 26.3%R (reported) |
| Bifaciality | Up to 90%R (reported) |
| Power temperature coefficient | -0.26%/°CR (reported) |
| Cell sales, H1 2026 | 34.78 GWR (reported) |
| Cumulative cell shipments | Over 400 GWR (reported) |
R reported by the company
Tongwei
Polysilicon, TOPCon and HJT solar cells
Chinese group that is the world's largest maker of solar-grade polysilicon and has shipped the most solar cells of any company for nine years running. It also makes modules and is a major fish-feed producer. Based in Chengdu.
