Tungsten hexafluoride (WF₆) for ALD

1. Product Overview

Tungsten hexafluoride (WF₆) is the highest-purity tungsten precursor available for atomic layer deposition (ALD), enabling nanometer-scale thin-film metallization in advanced semiconductor manufacturing. Its primary industrial use is in depositing tungsten thin films for logic and memory devices, where uniform step coverage and low resistivity are critical. The key value proposition is exceptional process stability and repeatability, directly reducing defect density and improving wafer yield. As feature nodes shrink below 3nm, WF₆ for ALD has become strategically irreplaceable for leading fabs, MEMS, and next-generation DRAM/NAND production.

2. Key Specifications & Technical Characteristics

• Chemical composition: Tungsten hexafluoride (WF₆), ≥99.999% (5N) purity

• Physical characteristics: Colorless gas at room temperature; pale yellow liquid under autogenous pressure; vapor pressure ~13.7 psi at 20°C; molecular weight 297.84 g/mol

• Impurity control: Metals (each) < 0.1 ppm; H₂O < 0.5 ppm; HF < 0.5 ppm; non-volatile residues < 10 ppm

• Packaging options: Stainless steel cylinder (SUS316L) with diaphragm valve; sizes: 1L, 5L, 10L, 47L; vacuum-purged and helium leak-tested

• Shelf life: 24 months from date of analysis when stored upright below 40°C in original sealed cylinder

3. Core Industrial Applications

• Semiconductor logic and foundry: Tungsten contact plugs, gate metallization, and barrier layers — outperforms PVD tungsten with >99% conformality on high-aspect-ratio (>10:1) structures

• Memory manufacturing (3D NAND, DRAM): Word-line metallization and through-silicon via (TSV) filling — reduces resistivity to <15 µΩ·cm, enabling faster read/write cycles

• MEMS and advanced packaging: Sealed cavity formation and redistribution layers — lower deposition temperature (250–350°C) minimizes thermal budget compared to CVD alternatives

• Cost advantage: Higher nucleation density on oxide/nitride surfaces reduces precursor consumption per cycle by ~18–22% versus competitor WF₆ grades

4. Competitive Advantages

• Quality consistency: ISO 9001:2025 certified batch-to-batch reproducibility with SPC-controlled manufacturing; each cylinder includes full GC-MS and ICP-MS certificate of analysis

• Supply reliability: Dedicated ALD-grade production line with 99.5% on-time delivery rate to Tier-1 fabs in Taiwan, Korea, Japan, and EU

• Logistics capability: UN 2192 classified; DG-certified global shipping with real-time temperature/pressure monitoring for high-value shipments

• Price competitiveness: Tiered pricing at >20MT annual off-take volume — 12–15% below European specialty gas distributors

• Sustainability & support: Returnable cylinder program reduces packaging waste; on-site technical application engineers available for ALD process optimization and safety protocol documentation

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 10 kg net weight (equivalent to ~5L cylinder)

• BULK 20MT loading capacity: 20 metric tons per ISO container (40 ft) — configured as 20 cylinders of 1,000 kg net each or equivalent manifolded pallet system

• Lead time for bulk order: 4–6 weeks after PO and deposit confirmation