First Solar sues JA Solar, American Panel Solutions over TOPCon patents

· Energy · United States · China

First Solar, the largest U.S. solar manufacturer, has filed a patent infringement lawsuit in federal court against China's JA Solar and American Panel Solutions, a subsidiary of Corning. The suit concerns imported TOPCon cell technology, escalating First Solar's legal campaign against overseas rivals that make the next-generation cells. The dispute centers on intellectual property around TOPCon, the cell architecture that has rapidly become the dominant high-efficiency silicon technology and now underpins most new module capacity worldwide. The case could affect how TOPCon cells are imported and sold in the United States, and signals that trade and IP friction in solar is shifting from tariffs toward courtroom battles over cell technology. Manufacturers that rely on imported TOPCon cells, and their U.S. customers, face new legal uncertainty.

Why it matters：IP litigation over TOPCon could reshape the supply chain of the world's dominant solar cell technology and set precedents for how imported cells enter major markets.

Key points

  • First Solar is the largest U.S. solar manufacturer.
  • The suit targets China's JA Solar and Corning subsidiary American Panel Solutions.
  • The dispute concerns imported TOPCon cell technology.

Sources (original reporting)

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