China’s Ministry of Commerce (Mofcom) and Ministry of Industry and Information Technology (MIIT) have proposed prohibiting exports of selected high-efficiency perovskite and tandem solar manufacturing technologies, alongside new restrictions on advanced polysilicon, wafer and crystalline-silicon cell production know-how.

The proposals, published on Oct. 16 under Joint Announcement No. 48 of 2026, would add 12 photovoltaic technologies to China’s Catalogue of Technologies Prohibited or Restricted from Export. They are part of a broader consultation covering 40 technologies across sectors including solar energy, artificial intelligence and biomedicine. The public consultation runs until Nov. 15.

The proposed export bans cover production processes and related equipment manufacturing technologies for perovskite-silicon tandem solar cells based on wafers measuring at least 182 mm and achieving conversion efficiencies of 30% or higher. They also include slot-die coating processes for perovskites with coating widths of at least 1.1 meters.

Additional thresholds apply to large-area modules, including single-junction perovskite modules measuring at least 1 square meter with conversion efficiencies of 18% or higher, and perovskite tandem modules of the same minimum area with efficiencies of at least 28%. The proposed controls target manufacturing technologies meeting these specifications rather than exports of finished modules.

Other technologies proposed for prohibition include cold-hydrogenation fluidized-bed processes for trichlorosilane production with annual single-line capacities of at least 250,000 metric tons, and silane-based fluidized-bed processes with annual capacities of at least 20,000 metric tons. The draft also covers processes for manufacturing silicon wafers no thicker than 70 micrometers and certain edge-passivation technologies for thin crystalline-silicon cells, along with related equipment manufacturing know-how.

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