polysilicon

Polysilicon is produced by purifying metallurgical-grade silicon into a high-purity form (typically 9N–11N, meaning 99.9999999%+ pure) suitable for slicing into wafers. It sits at the base of two strategically important value chains: solar photovoltaics and semiconductors, though the purity grades and market structures differ sharply between them.

Global production is highly concentrated. China accounts for the large majority of solar-grade polysilicon output, with significant capacity in the Xinjiang Uyghur Autonomous Region. Other notable producers include Wacker Chemie (Germany), OCI (South Korea, with Malaysian operations), Hemlock Semiconductor (United States), and GCL, Tongwei, Daqo, and Xinte (China). Semiconductor-grade polysilicon, which requires higher purity, remains dominated by a small number of firms in Germany, the United States, Japan, and South Korea.

Polysilicon has become a flashpoint in trade and human-rights policy:

• The Uyghur Forced Labor Prevention Act (UFLPA), signed by President Biden in December 2021 and effective June 2022, creates a rebuttable presumption that goods produced wholly or in part in Xinjiang are made with forced labor and are barred from entry into the United States. U.S. Customs and Border Protection has detained shipments from major Chinese solar module makers under this authority.
• The U.S. Department of Commerce has imposed Withhold Release Orders and entity-list designations on specific Xinjiang polysilicon producers, including Hoshine Silicon Industry (June 2021).
• The European Union's Forced Labour Regulation, adopted in 2024, creates a parallel mechanism to ban products made with forced labour from the EU market.
• Trade remedies including antidumping and countervailing duties have repeatedly targeted Chinese solar inputs since the early 2010s.

Polysilicon prices are notoriously volatile, swinging with solar demand cycles, and capacity decisions are increasingly shaped by industrial policy such as the U.S. Inflation Reduction Act (2022) and EU Net-Zero Industry Act (2024), which incentivize onshore or allied production.