Phosphorus-Doped Polycrystalline Silicon Wafers from Mexico
Wafers made from polycrystalline silicon doped with phosphorus for n-type semiconductor properties, used in thin-film transistors and sensors. They are specifically covered by HTS 3818.00.0020 as doped chemical elements in electronic-grade wafer forms. Doping creates the necessary charge carriers for electronic functionality.
Duty Rate — Mexico → United States
0%
Rate breakdown
9903.05.860%Universal product exemption (U.S. note 52(b))
Import Tips
• Include resistivity measurements (e.g
• 1-10 ohm-cm) in commercial invoices for accurate valuation
• Register with EPA for TSCA if containing reportable dopants; inspect for wafer bow or warp pre-shipment