Silicon carbide wafer price

When sourcing SiC wafers, the price is primarily driven by polytype (4H-SiC is standard), wafer diameter (6-inch vs. 8-inch), and crystalline quality. You must specify the doping type (N-type for power devices or Semi-insulating for RF). Key metrics affecting cost include Micropipe Density (MPD <0.1 cm⁻²), Total Thickness Variation (TTV <5μm), and Surface Roughness (Ra <0.2nm). Higher grade 'Prime' wafers for epitaxy command a premium over 'Dummy' or 'Research' grades.

The Physical Vapor Transport (PVT) method is the industry standard, but its high energy consumption and slow growth rate make SiC significantly more expensive than silicon. To optimize costs, buyers should evaluate Grade A (Production Grade) for mass manufacturing versus Grade B or Research Grade for R&D. 8-inch wafers offer better long-term economic feasibility due to higher chip yields per wafer, though the initial unit price is substantially higher than 6-inch wafers.

Suppliers must adhere to SEMI Standards (e.g., SEMI M55) which dictate the specifications for polished monocrystalline SiC wafers. Ensure the manufacturer is ISO 9001 and IATF 16949 certified, especially if the wafers are intended for the automotive EV market. Additionally, verify RoHS and REACH compliance to ensure the materials meet international environmental safety regulations for electronic components.

The biggest risks are logistics-related damage and quality inconsistency. SiC is brittle; ensure the supplier uses double-layered vacuum packaging and ESD-safe wafer carriers. To mitigate quality risks, use Made-in-China.com's Secured Trading services and insist on a Certificate of Analysis (CoA) for every batch. Consider a third-party pre-shipment inspection to verify crystal orientation and defect density.

SiC supply chains are often tight. Negotiate for Rolling Forecasts rather than one-off spot buys to secure stable pricing. For volumes exceeding 100 pieces, aim for a 10-15% volume discount. Discuss 'Price Adjustment Clauses' linked to raw material (high-purity graphite/silicon powder) costs. Always clarify if the quoted price includes Epi-ready polishing, as this is a major cost driver.

SiC wafers are often classified under HS Code 381800 (Chemical elements doped for use in electronics). Be aware of Export Control Licenses, as high-grade semi-insulating wafers may be subject to dual-use technology restrictions in certain jurisdictions. For shipping, Air Freight is mandatory to minimize vibration and transit time. Ensure the incoterms are clearly defined—FOB or FCA are preferred to maintain control over the specialized electronics forwarder.