High‑Purity Silicon

Description

1. Product Overview

High‑Purity Silicon is a crystalline metalloid refined to 99.999% (5N) minimum, with optional 6N–7N grades. It is primarily used as the base feedstock for monocrystalline and multicrystalline ingots in semiconductor devices and photovoltaic solar cells. The key value proposition is its ultra‑low defect density and tightly controlled dopant carrier concentration, which directly translates into higher device yields and longer operational lifetimes. Strategically, it enables manufacturers to meet tightening emissions regulations and renewable energy targets while reducing wafer‑level breakage and rejection rates.

2. Key Specifications & Technical Characteristics

• Chemical composition: Si ≥ 99.999%; major impurities controlled: Fe, Al, Ca, Cu, B, P (each < 0.1 ppm for 6N grade)

• Purity level: 5N (99.999%) standard; 6N (99.9999%) and 7N available upon request

• Physical characteristics:

  • Form: Irregular lumps, chips, or granular (0.5–10 mm; custom sizes available)

  • Color: Silver‑gray metallic luster

  • Density: 2.33 g/cm³ (bulk density varies by form: 1.2–1.5 g/cm³ for granular)

• Packaging options:

  • 25 kg sealed polyethylene bags under argon flush

  • 500 kg supersacks with desiccant

  • 1 MT vacuum‑sealed drums

• Shelf life: 36 months in unopened, dry, inert‑atmosphere packaging; avoid humidity > 60% RH

3. Core Industrial Applications

• Semiconductors (IDMs & foundries): Used as starting material for Czochralski (CZ) and float‑zone (FZ) crystal growth. Outperforms lower‑purity feedstocks by reducing microdefects and improving oxide integrity, directly lowering wafer reject rates by up to 18%.

• Photovoltaics (solar cell manufacturers): Feedstock for cast multicrystalline and monocrystalline PERC/TOPCon ingots. Consistent boron‑dopant levels enable tighter cell efficiency bins, reducing module sorting costs.

• Advanced alloys & aluminum castings: Added to Al‑Si alloys for engine blocks and EV battery housings; improves fluidity and reduces porosity compared to standard metallurgical silicon, cutting scrap rates by ~12%.

• High‑power electronics & SiC substrates: Base material for silicon carbide precursors; low iron and nickel content prevents shunt formation in high‑voltage devices.

4. Competitive Advantages

• Quality consistency: Every lot certified by ICP‑MS and GDMS; certificate of analysis included; deviation in key impurities < 5% across shipments.

• Supply reliability: Dual sourcing from Norwegian (hydropower‑based) and Malaysian (natural gas) reduction plants, ensuring 100% delivery adherence over 24 months.

• Logistics capability: 20 MT bulk loading per 20’ standard container; expedited air‑freight options for urgent < 2 MT orders.

• Price competitiveness: Volume tier pricing from 20 MT to 500 MT / month; price‑lock contracts for 12‑24 months available.

• Sustainability: 78% renewable‑powered smelting; carbon footprint data available per kg Si; recyclable packaging program.

• Technical support: Dedicated metallurgist for doping calculations and crucible compatibility; 24‑hour response for COA queries.

5. Commercial & Supply Information

• Minimum order quantity (MOQ): BULK 20MT (twenty metric tons) per product grade

• Loading capacity: 20 MT per 20’ dry container (standard); up to 24 MT per 20’ with high‑density granular form (subject to weight limits)