Selenium hexafluoride

Description

1. Product Overview
Selenium hexafluoride (SeF₆) is a high-purity, inorganic fluorine compound supplied as a compressed gas, essential for specialized semiconductor and electronics manufacturing processes. Its primary industrial use lies in the plasma etching and chemical vapor deposition (CVD) chamber cleaning for advanced logic and memory chips. The key value proposition is its ability to deliver exceptionally precise, residue-free etching of selenium-based materials and silicon layers, enabling higher transistor density. Strategically, it is critical for fabs transitioning to sub-5nm architectures where traditional fluorocarbons introduce unacceptable defect rates.

2. Key Specifications & Technical Characteristics

• Chemical composition: Selenium hexafluoride (SeF₆) ≥ 99.97% purity

• Impurity control: O₂ ≤ 20 ppm, N₂ ≤ 30 ppm, CF₄ ≤ 10 ppm, H₂O ≤ 5 ppm, acidity (as HF) ≤ 5 ppm

• Physical form: Colorless, odorless, non-flammable compressed gas

• Density (gas at 20°C, 1 atm): 6.68 g/L

• Vapor pressure (21°C): 12.7 bar (abs)

• Packaging options: Stainless steel DOT/UN-certified cylinders (10L, 44L, 470L Y-cylinders) with CGA 660 or DIN 8 outlet valves; overpacked in ventilated outer boxes

• Shelf life: 24 months from date of analysis when stored upright in clean, dry, ventilated area below 50°C

3. Core Industrial Applications

• Primary industries: Semiconductor foundries, IDMs (integrated device manufacturers), advanced memory (3D NAND, DRAM) producers, and specialty gas blending houses.

• Operational use cases: (1) High-aspect-ratio plasma etching of selenide-based phase-change memory (PCRAM) and ovonic threshold switch (OTS) films. (2) Chamber cleaning for CVD tools depositing selenium-containing precursors. (3) Doping agent for selenium‑rich chalcogenide glasses in infrared optics.

• Why superior to alternatives: Compared to NF₃ or SF₆, SeF₆ provides a lower global warming potential (GWP < 200 vs. > 10,000 for SF₆) and higher etch selectivity (> 30:1) over underlying silicon dioxide. Efficiency gain: 22% faster etch rates at equivalent RF power, directly reducing wafer cost and tool downtime.

4. Competitive Advantages

• Quality consistency: Statistical process control (SPC) on every batch; certificates of analysis (CoA) provided with real-time ICP-MS impurity data.

• Supply reliability: Dedicated production capacity in three geographically redundant facilities (Americas, EMEA, Asia-Pacific); no single-point-of-failure risk.

• Logistics capability: ISO 9001:2024 and RCMS-certified supply chain; real-time cylinder tracking and just-in-time (JIT) delivery to fab dock.

• Price competitiveness: Volume‑tiered pricing with long-term take-or-pay contract options; fully transparent surcharge mechanism for fluorine feedstock.

• Sustainability: Reclaimable cylinder return program; zero ozone depletion potential (ODP) and reduced f-gas tax exposure for EU and California buyers.

• Technical support: 24/7 application engineering access; pre‑installation safety reviews; onsite gas panel compatibility testing included for first order.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): 10 cylinders of 44L each (approx. 47 kg net SeF₆)

• BULK 20MT loading capacity: Not applicable – SeF₆ is not shipped as a bulk liquid or cryogenic liquid in ISO tanks due to product stability constraints. Maximum single shipment: 80 x 470L Y-cylinders per 20ft container = net 2,400 kg (2.4 MT) of SeF₆ gas.

• MT per container (20ft standard dry van): 2.4 MT net gas weight; container gross weight including cylinders, valve gua