Cadmium telluride 99.999%

For high-purity Cadmium Telluride (CdTe), the purity level of 99.999% (5N) is the most critical factor, meaning total metallic impurities must be less than 10ppm. Buyers should demand a Certificate of Analysis (COA) that specifies levels of trace elements like Copper (Cu), Iron (Fe), and Lead (Pb), as these significantly impact semiconductor performance. Additionally, specify the physical form required, such as powder, granules, or sputtering targets, as the particle size distribution affects the melting rate and film uniformity in thin-film solar cell production.

This material is primarily used in thin-film photovoltaic (PV) modules, where it serves as the light-absorbing layer. It is also essential for infrared optical windows, electro-optic modulators, and radiation detectors (CZT). Because 5N purity is a semiconductor-grade material, it is vital for applications requiring high carrier mobility and low thermal noise.

Cadmium compounds are strictly regulated due to toxicity. Suppliers must provide a Material Safety Data Sheet (MSDS/SDS) compliant with GHS standards. For international trade, ensure the product meets REACH (EU) or TSCA (US) regulations. Packaging must adhere to UN-certified hazardous material standards (Class 6.1 toxic substances) to prevent leakage during cross-border transit.

Prioritize suppliers with ISO 9001:2015 certification for quality management. Request ICP-MS (Inductively Coupled Plasma Mass Spectrometry) test reports, which are the industry standard for detecting trace impurities at the 5N level. On Made-in-China.com, look for Audited Suppliers who have undergone third-party on-site inspections to verify their production capacity and laboratory testing capabilities.

The biggest risk is impurity contamination during packaging or transit, which can downgrade 5N material to 4N, rendering it useless for semiconductors. Another risk is regulatory seizure if the chemical is not declared correctly under the proper HS Code (typically 2853.90). Always use vacuum-sealed double-layer plastic packaging inside a rigid container to maintain purity and safety.

Pricing for 5N CdTe is highly sensitive to the market price of Tellurium metal. Negotiate based on a formula-based pricing model linked to minor metal market indexes. While MOQs for high-purity materials can be as low as 1kg, you can often secure a 10-15% discount for annual volume contracts (blanket orders) compared to spot market purchases.

Cadmium Telluride is classified as a hazardous material (Class 6.1). You must use a freight forwarder specialized in DG (Dangerous Goods) cargo. Ensure the supplier provides a 'Dangerous Goods Declaration' and that the shipment is sent via sea freight or specialized air cargo that accepts toxic substances. For small samples, verify if the carrier accepts 'Excepted Quantities' to reduce shipping costs.

Use Secured Payment services provided by Made-in-China.com to ensure funds are only released after the shipping documents are verified. For large bulk orders, it is standard practice to use a Letter of Credit (L/C) or a 30% deposit / 70% against Bill of Lading (B/L) structure. Always hire a third-party inspector (like SGS or Intertek) to sample the material at the supplier's warehouse before the final balance is paid.