Precision Oxygen Control, Empowering Chip Manufacturing —— Anhui Tianfen Zirconia Trace Oxygen Analyzer: Safeguarding Quality Throughout the Entire Semiconductor Chip Manufacturing Process

In 5nm、 3nm In the manufacturing of advanced-node chips, Trace oxygen ( ppm/ppb Level) is the core hidden variable that affects yield and performance. : Even one in a million ( parts per million ) even one in a billion ( parts per billion Even trace amounts of residual oxygen can trigger wafer surface oxidation, thin-film defects, and abnormal interface states, directly leading to chip leakage, threshold voltage drift, and a sharp drop in yield. Anhui Tianfen Instruments specializes in the R&D and manufacturing of zirconia oxygen analyzers, offering high-precision, fast-response, and highly stable trace-oxygen monitoring solutions that cover all critical process steps in chip manufacturing. These solutions help semiconductor manufacturers tightly control oxygen levels, improve product quality, and reduce production costs.

I. Chip Manufacturing: Which Processes Require Oxygen Measurement and Control?

Semiconductor wafer manufacturing, from front-end processes to back-end packaging, Eight Core Process Sections Precise oxygen-content monitoring and control are essential, directly determining chip yield and reliability:

1.  Epitaxial growth ( Epitaxy )

• Measurement locations: epitaxial furnace chamber, carrier gas (high-purity H ₂ 、 N ₂ ) Piping
• Control objectives: to prevent natural oxidation of the silicon substrate surface and to suppress the incorporation of impurity oxygen into the epitaxial layer; to ensure uniform epitaxial layer thickness, lattice integrity, and consistent electrical parameters, thereby avoiding leakage current and reduced carrier mobility.
• Oxygen control objective: ≤0.1~1 ppm

2.  High-temperature oxidation /  Diffusion ( Oxidation/Diffusion )

• Measurement locations: oxidation furnace, diffusion furnace chamber, process gases ( O ₂ 、 N ₂ 、 Ar ) Import and export
• Control objective: Precise regulation Silicon dioxide ₂ Oxide layer thickness and uniformity; suppression of impurity oxygen interference on doping concentration, ensuring PN Junction and gate oxide quality, preventing oxide pinholes and abnormal breakdown voltage.
• Oxygen control objective: 0.1 ppm~100% Precisely adjustable

3.  Atomic layer deposition ( ALD ) /  Chemical vapor deposition ( Chemical Vapor Deposition )

• Measurement location: ALD/CVD Reaction chamber, precursor protective gas, vacuum chamber
• Control objective: Prevent metal /  Dielectric thin film ( HfO ₂ 、 All ₂ O ₃ 、 Silicon Nitride ) Oxidation and film-forming defects; enhancing film density and interface quality, reducing gate leakage current, and improving device reliability.
• Oxygen control objective: ≤0.01~1 ppm ( parts per billion Level)

4.  Lithography ( Lithography )

• Measurement locations: lithography tool chamber, photoresist protective atmosphere, and localized cleanroom environment
• Control objectives: to prevent photoresist oxidation and degradation of its photosensitivity; to ensure photolithographic pattern accuracy and line-width uniformity, reduce pattern distortion and defects, and ensure process compatibility. EUV Advanced Process Requirements
• Oxygen control objective: ≤1 ppm

5.  Etching ( Etching )

• Measurement locations: dry etch chamber, exhaust gas treatment system, and inert shielding gas.
• Control objectives: prevent post-etch oxidation of the wafer surface and sidewall damage; ensure etch uniformity and selectivity to avoid circuit shorting. /  Open circuit
• Oxygen control objective: ≤0.5~5 ppm

6.  Annealing ( Annealing , rapid thermal annealing RTA / Furnace tube annealing)

• Measurement locations: annealing furnace chamber, protective gas ( N ₂ 、 Ar 、 H ₂ )
• Control objectives: repair ion implantation damage, passivate dangling bonds on the silicon surface, and stabilize interface states; precise control “ Little Oxygen ”  Atmosphere, removal of hydrocarbon impurities, suppression of defects, and enhancement of device stability.
• Oxygen control objective: 0.1~10 ppm Precise control

7.  Wafer Cleaning /  Ultrapure water ( Ultra-Pure Water ) System

• Measurement locations: cleaning tank, ultrapure water delivery piping, and drying protective atmosphere
• Control objective: Prevent cleaning /  Natural oxidation occurs on the wafer surface during the drying process; dissolved oxygen is controlled ( DO ), to prevent metal corrosion and particle adhesion, thereby ensuring wafer surface cleanliness.
• Oxygen control objective: Dissolved oxygen ≤5 ppb , atmospheric oxygen ≤0.1 ppm

8.  Packaging and testing ( Packaging & Testing )

• Measurement locations: bonding chamber, plastic encapsulation protective atmosphere, nitrogen cabinet, glove box
• Control objective: to prevent oxidation of chip pins and pads, enhance bond strength and package hermeticity, avoid internal oxidation-induced failure after packaging, and extend chip lifespan.
• Oxygen control objective: ≤1~10 ppm

II. Why is oxygen control so critical? The fatal hazards of uncontrolled oxygen levels

1. Wafer surface oxidation : A native oxide layer rapidly forms on the silicon surface, altering the interface characteristics and increasing contact resistance, which leads to threshold voltage drift and performance variability in devices.
2. Thin-film defects : Deposition /  During the epitaxial growth process, oxygen impurities are incorporated, leading to the formation of pinholes, cracks, and interface states, which in turn cause leakage current, breakdown failure, and a sharp drop in yield.
3. Lithography /  Etching deviation : Oxygen causes photoresist degradation, reduces etch selectivity, leads to linewidth errors and pattern distortion, and in advanced process nodes can result in the outright scrapping of entire wafers.
4. Decreased reliability : Oxygen contamination leads to long-term device aging, increased leakage current, and reduced device lifespan, severely compromising the stability of chips in high-end electronics, automotive electronics, and industrial control applications.

III. Anhui Tianfen Zirconia Trace Oxygen Analyzer: A Cutting-Edge Semiconductor-Based Oxygen-Control Solution

Anhui Tianfen specializes in zirconia oxygen analyzers and offers customized solutions tailored to the demanding operating conditions of the semiconductor industry—vacuum, high temperature, ultra-pure gases, and corrosion resistance. Core advantages:

✅ Ultra-high precision, coverage ppb/ppm Full scale

• Measurement range: 0.1 ppb~100% VOL , meeting all application scenarios from ultra-pure protective gases to process oxidation
• Accuracy: ±1%FS~±3%FS ， parts per billion Stable output at the level, compatible SEMI Semiconductor Industry Standard

✅ Ultra-fast response, real-time capture of oxygen fluctuations

• T90 Response time **≤2~5 seconds ** , rapidly detect changes in oxygen concentration and dynamically adjust the process system in real time to prevent oxygen overlimitation from causing batch defects.
• Fast preheating, zero delay /  Extremely low range drift and long-term stable, reliable operation.

✅ Vacuum /  High-temperature compatibility, corrosion resistance, and anti-poisoning

• Support Direct insertion installation in the vacuum chamber ( KF/ISO Flange), compatible 10 ⁻ ³ Pa~ Under ambient pressure conditions, no complex sampling is required, thus avoiding secondary contamination.
• Special anti-contamination coating for sensors, resistant to semiconductor process gases such as silanes, halogens, and ammonia, with extended service life. ≥3~5 Year, significantly reduce maintenance costs

✅ Intelligent integration for seamless alignment with production line automation

• Support RS485 、4-20mA、 EtherCAT 、 Modbus Industrial protocols can be accessed. FAB factory MES/PLC System that enables remote monitoring, data traceability, and automatic alarm notification.
• Built-in temperature compensation, automatic calibration, and fault diagnosis; compatible with 24 hours Continuous mass production demand

IV. Application Value: Achieving Quality and Efficiency Through Precise Oxygen Control

1. Yield improvement : Critical process oxygen fluctuation is controlled within ±0.1 ppm Inside, chip yield can be improved. 5%~15% , significantly reducing wafer scrap costs
2. Stable performance : Reduces interface oxidation and thin-film defects, significantly narrows the dispersion of device parameters such as leakage current and threshold voltage drift, and meets the high-reliability requirements for automotive-grade and industrial-grade applications.
3. Reduce costs and increase efficiency : Reduce process rework, equipment maintenance, and consumable waste; long-life sensors lower spare-parts and downtime costs.
4. Compliance and Standards Compliance : to satisfy SEMI Standards, cleanroom practices, and high-purity gas control requirements support high-end process certification.

Conclusion

Chip manufacturing reveals true excellence in the minutest details; oxygen-content control determines success or failure down to the smallest fraction of a millimeter. As a specialized manufacturer of zirconia oxygen analyzers, Anhui Tianfen Instruments has long been dedicated to the field of industrial gas analysis, offering domestically developed, high-precision solutions that provide end-to-end trace-oxygen monitoring for semiconductor chip fabrication—thereby helping China’s semiconductor industry break through in advanced process technologies and enhance its core competitiveness.

Choosing Anhui Tianfen means choosing Precise, stable, and reliable Our oxygen-control partners ensure that every wafer delivers exceptional quality and every chip performs flawlessly.