SiH4, GeH4, BCl3 and NF3: What Each Process Gas Does in Semiconductor Manufacturing

In semiconductor manufacturing, silane (SiH4) and germane (GeH4) are the deposition gases that grow silicon and silicon-germanium layers, while boron trichloride (BCl3) and nitrogen trifluoride (NF3) dominate the etch and clean side – BCl3 for aluminum metal etch and boron doping, NF3 for in-situ CVD chamber cleaning, etch, and flat-panel-display and photovoltaic manufacturing. Each gas pairs a different chemistry with a different hazard profile, so purity grade, package, valve interface and safety program must be specified together. This guide covers the process role, key specifications and buying checks for each gas.

Deposition gases: SiH4 and GeH4

Silane (SiH4) – the silicon deposition workhorse

Silane decomposes at temperatures compatible with semiconductor processing and deposits high-purity silicon, which makes it the standard source for CVD and epitaxial silicon, amorphous-silicon and silicon-nitride films across logic, memory and photovoltaic manufacturing. Because silane is pyrophoric – it can ignite spontaneously in air – the supply chain relies on inert purging, gas detection and leak-tight, gas-specific fittings. Common packages: 47L cylinder at 10 kg net, or Y-440L cylinder at 125 kg, on CGA632/DISS632.

Germane (GeH4) – SiGe epitaxy and germanium deposition

Germane feeds germanium into epitaxial silicon-germanium (SiGe) layers used to strain-engineer channels in advanced logic devices, and into germanium films for optoelectronics, photodetectors and specialized solar cells. Germane is a toxic gas (UN2192), so handling relies on continuous monitoring, ventilated gas cabinets and low-leak connections; it is typically ordered in small fills – 2 kg net in 44L or 47L cylinders on CGA/DISS632.

Etch and clean gases: BCl3 and NF3

Boron trichloride (BCl3) – aluminum etch and boron doping

BCl3 is a chlorinated etch gas for metal patterning. In plasma processes it etches aluminum and aluminum alloys – it helps remove the native aluminum oxide so the etch starts uniformly – and it also serves as a boron-doping source. BCl3 is toxic and corrosive (UN1741; DOT 2.3 and 8) and reacts with moisture, so it needs dry, corrosion-resistant, moisture-tight components. Grades: 5N/5.5N/6N; package: 47L cylinder, 50 kg net; connections DISS-634/CGA660.

Nitrogen trifluoride (NF3) – chamber cleaning and etch

NF3 is the standard in-situ CVD chamber-cleaning gas: a plasma dissociates NF3 into fluorine radicals that strip silicon-containing deposits from chamber walls without opening the tool. It is also used in etch processes and in flat-panel-display and photovoltaic manufacturing. NF3 is non-flammable but a strong oxidizer, so it is kept away from flammables and handled in oxidizer-compatible hardware. Typical package: 40L cylinder, 20 kg net, CGA640.

Key specifications at a glance

Notes: BCl3 physical constants per supplier data – melting point -107.3 °C, boiling point 12.5 °C. *NF3 purity and UN number are not published on the referenced product page – request the current specification. Grades are commercial ranges; confirm the component-level impurity spec for your process.

Safety by gas: four hazard profiles

• SiH4 – pyrophoric (UN2203). Can self-ignite in air; use gas cabinets with inert purge, and keep away from oxidizers and ignition sources.
• GeH4 – toxic (UN2192). Continuous gas monitoring, ventilation and leak-tight connections, with respiratory protection for emergencies.
• BCl3 – toxic and corrosive (DOT 2.3 & 8). Dry, corrosion-resistant components, fume control and full PPE.
• NF3 – non-flammable strong oxidizer. Keep away from flammables and reducing agents; use oxidizer-compatible materials only.

Across all four gases, keyed DISS connections prevent cross-connection and cross-contamination, gas detection plus ventilation covers leaks, and cylinders should be secured and handled per the supplier’s MSDS.

Buying checklist for process gases

1. Match purity to the process. Choose 5N/5.5N/6N or the 99.9%-99.999% ranges above, and request component-level impurity specs.
2. Confirm interface compatibility. The valve outlet must match your gas stick or tool – CGA632/DISS632 for silane and germane, DISS-634/CGA660 for BCl3, CGA640 for NF3.
3. Check packaging and logistics. Verify net fill weight, cylinder certification and DOT/UN compliance for your destination.
4. Demand batch documentation. Request a CoA with chromatogram for every delivered lot.
5. Qualify the supplier’s hazmat record. Process gases are regulated dangerous goods. Newradar Gas has 10 years of hazardous-goods import/export experience, exports to 40+ countries and regions, and has passed SGS factory audits.
6. Collect safety documentation. MSDS, handling instructions and local storage rules (such as hazardous-chemicals warehousing) before the cylinder arrives.

FAQ

Q1: Why is silane so widely used for silicon deposition?
A1: Silane decomposes at process-compatible temperatures and deposits high-purity silicon, making it the common choice for CVD and epitaxial silicon, amorphous-silicon and silicon-nitride films. It is pyrophoric, so it must be handled in inert-purged, leak-tight systems.

Q2: What is germane used for in a fab?
A2: Germane is used mainly for SiGe epitaxy and germanium deposition in advanced devices, optoelectronics and specialized solar cells. It is toxic and requires continuous monitoring, ventilation and leak-tight connections.

Q3: Why is BCl3 used for aluminum etching?
A3: BCl3 supports aluminum plasma etch – it removes the native aluminum oxide so the etch starts uniformly – and it can also act as a boron-doping source. It is toxic and corrosive (UN1741; DOT 2.3 and 8), so it needs dry handling.

Q4: Where does NF3 fit into semiconductor manufacturing?
A4: NF3 is mainly an in-situ CVD chamber-cleaning gas: plasma-generated fluorine radicals remove chamber deposits without opening the tool. It is also used in etch processes and in flat-panel-display and photovoltaic manufacturing. It is non-flammable but a strong oxidizer.

Q5: Which purity grades and packages are available for these gases?
A5: Silane and germane: 99.9%-99.999%; boron trichloride: 5N/5.5N/6N. Packages: 47L cylinder (10 kg SiH4), Y-440L cylinder (125 kg SiH4), 44L/47L cylinders (2 kg GeH4), 47L cylinder (50 kg BCl3) and 40L cylinder (20 kg NF3). Confirm the impurity spec for your process.

Q6: What should buyers verify before purchasing process gases?
A6: Match the purity grade to the process; confirm the valve interface matches your gas panel; request batch CoA and chromatograms with each delivery; and check the supplier’s hazardous-goods record, such as 10 years of hazmat import/export experience and exports to 40+ countries.

Sources

• Silane (SiH4) product page – nrdgas.com/sih4-silane-gas-product (packing and shipping data)
• Germane (GeH4) product page – nrdgas.com/geh4-germane-gas-product
• Boron trichloride (BCl3) product page – nrdgas.com/boron-trichloride-bcl3-gas-product
• Nitrogen trifluoride (NF3) product page – nrdgas.com/nitrogen-trifluoride-nf3-gas-product
• Newradar Gas 2026 corporate brochure and company fact sheet (company profile, export and compliance data)
• Statements on process roles and hazard classifications (pyrophoric, toxic, corrosive, oxidizer) reflect general semiconductor industry knowledge and are worded conservatively.

Planning a process-gas qualification or a new supply contract? Newradar Gas (Hubei Newradar Electronic Gas Co., Ltd., founded 2007) is one of China’s leading electronic specialty gas manufacturers, with automated explosion-proof weighing filling lines, in-house batch analysis and exports to 40+ countries. To discuss purity grades, packaging or valve interfaces for SiH4, GeH4, BCl3 or NF3, contact Newradar Gas through the contact page on nrdgas.com.