BOE Etchant (BUFFERED OXIDE ETCH)

Description

1. Product Overview

BOE Etchant (Buffered Oxide Etch) is a high-precision, ammonium fluoride-based wet etching solution engineered for controlled removal of silicon dioxide (SiO₂) films from silicon wafers and other semiconductor substrates. Its primary industrial application is in photolithography and microfabrication processes within the semiconductor, MEMS, and flat-panel display industries. The key value proposition is its unique buffered chemistry—ensuring stable etch rates, minimized undercutting, and superior selectivity over photoresist and silicon—making it strategically indispensable for defect-free, high-yield production at advanced technology nodes.

2. Key Specifications & Technical Characteristics

• Chemical Composition: Ammonium Fluoride (NH₄F) and Hydrofluoric Acid (HF) in precisely buffered ratio (standard 6:1, 7:1, or custom ratios upon request)

• Purity Grade: Semiconductor Grade (≥99.99% trace metals basis) / VLSI Grade available

• Physical Characteristics: Transparent, colorless to faint yellow solution; density: 1.09–1.12 g/cm³ (depending on ratio); viscosity optimized for spin/spray processing

• Key Performance Metrics: Controlled SiO₂ etch rate (e.g., 100–150 Å/min for 6:1 at 25°C); ±3% bath-to-bath uniformity; particle count <20 particles/mL (≥0.2 µm)

• Packaging Options: Cleanroom-ready HDPE containers: 1L, 5L, 20L carboys, 200L drums, and 1,000L IBC totes

• Shelf Life: 12 months from date of manufacture when stored unopened at 15–25°C in original, sealed container

3. Core Industrial Applications

• Semiconductor Wafer Fabrication (CMOS, memory, logic): Selective removal of pad oxide, sacrificial oxide, and gate oxide prior to deposition or epitaxy. Our BOE delivers linear etch control without pitting or residue, directly improving die yield per wafer.

• MEMS & Sensor Manufacturing: Release etching of sacrificial SiO₂ layers in accelerometers, gyroscopes, and pressure sensors. The buffered chemistry prevents stiction and structural damage to fragile silicon beams and proof masses, outperforming straight HF solutions.

• Flat-Panel Display & Photonics: Pattern oxide etching for TFT-LCD, OLED, and waveguide fabrication. Lower defect density reduces rework costs by up to 18% compared to un-buffered alternatives.

4. Competitive Advantages

• Quality Consistency: Batch-to-batch coefficient of variation (CV) <2% for etch rate – ensures repeatable process windows and reduces tool requalification frequency.

• Supply Reliability: Global multi-site filling operations with safety stock buffer; 99.5% on-time delivery rate for contracted customers.

• Logistics Capability: UN-certified packaging, full hazardous material compliance (DOT/IMDG/IATA), and temperature-controlled shipping lanes for all destinations.

• Price Competitiveness: Direct raw material sourcing and captive fluorination capacity enable a 12–15% lower TCO (total cost of ownership) than specialty chemical incumbents for equivalent grade.

• Sustainability & Support: 55% lower post-use ammonium fluoride waste via closed-loop recovery option; full access to digital SDS, COA, and 24/7 process engineering support.

5. Commercial & Supply Information

• Minimum Order Quantity (MOQ): 1 x 200L drum (200 liters) for initial qualification orders; 4 drums (800 liters) for recurring production contracts.

• BULK 20MT Loading Capacity: One ISO tank container holds 20 metric tons (20,000 kg) of BOE etchant.

• Container Loading per 20FT: 80 x 200L drums (16,000 kg net) per standard 20FT container; 20 x 1,000L IBC totes (20,000 kg net) also available.