As semiconductor manufacturing advances toward 3nm, 2nm and more advanced process nodes, tiny temperature fluctuations have become an invisible bottleneck limiting chip yield. Nanometer overlay errors in lithography machines, reaction drift in etching chambers, and uneven thin-film deposition are often caused by temperature deviations beyond ±0.1°C.
Semiconductor Process Chiller acts as the high-precision thermal management core equipment. When matched with Perfluoropolyether (PFPE) high-performance cooling fluid, it forms a constant temperature protection system for advanced semiconductor processes. This combination is indispensable for critical procedures including DUV/EUV lithography, etching, and thin-film deposition. This article professionally explains the working principle, core characteristics, application scenarios and industry development trends of Process Chiller and PFPE cooling fluid.
1. Semiconductor Process Chiller: Precision Temperature Control
A Semiconductor Process Chiller is a high-precision, ultra-clean temperature control device specially designed for front-end wafer fabrication. Different from ordinary industrial water chillers, it features sub-degree temperature control, ultra-clean fluid pipelines, and 24/7 uninterrupted stable operation, directly determining process repeatability and chip yield.
1.1 Working Principle: Closed-Loop Heat Exchange for Nanometer-Level Temperature Stability
Semiconductor Process Chiller adopts vapor compression refrigeration cycle and dual-loop heat exchange design:
1. Process Loop: High-purity cooling fluid (PFPE / DI water) flows through key components such as lithography optical lenses, etching chambers and deposition reaction cavities, absorbs heat and returns to the chiller.
2. Refrigeration Loop: Composed of compressors, condensers, evaporators and throttle valves, it transfers heat from the process loop to the external cooling water through refrigerant phase change.
3. Precision Intelligent Control: Equipped with high-resolution PT1000 temperature sensors and multi-stage PID control algorithm, it responds to load fluctuations in milliseconds, achieving ultra-high temperature control accuracy of ±0.01℃ ~ ±0.05℃. DUV process requires ±0.05℃ stability, while EUV lithography demands strict ±0.01℃ temperature consistency.
1.2 Core Technical Advantages
Ultra-High Temperature Control Accuracy: Advanced 7nm/5nm processes require coolant temperature fluctuation within ±0.05℃; EUV optical systems need ±0.01℃ stability to avoid thermal deformation and overlay deviation.
Ultra-Clean Fluid Circuit: Adopts 316L stainless steel, PFA/PVDF pipeline materials, equipped with 0.1μm high-efficiency filtration and ion exchange resin. It controls particle count below 1 particle/mL and metal ions within 0.1ppb to prevent wafer contamination.
Wide Temperature Range Operation: Covers -20℃ to +80℃, perfectly matching temperature requirements of DUV (18~22℃), EUV (-10℃~25℃), and etching (40~80℃) processes.
High Reliability & Material Compatibility: Supports 24/7 continuous operation with redundant design, compatible with PFPE, DI water and other cooling media. Widely adapted to domestic semiconductor equipment such as Naura, Advanced Micro-Fabrication Equipment and SMEE.
1.3 Main Application Scenarios in Semiconductor Manufacturing
Semiconductor Process Chiller is standard configuration for front-end wafer fabrication, covering four core processes:
DUV / EUV Lithography: Cools projection lenses, wafer stages and laser light sources to stabilize optical temperature and ensure overlay accuracy and linewidth uniformity.
Dry / Wet Etching: Cools RF electrodes and chamber walls, stabilizes plasma temperature, optimizes etching rate and morphology uniformity, and avoids thermal drift.
CVD / PVD Thin Film Deposition: Precisely controls reaction cavity temperature to ensure uniform thickness and composition of silicon oxide and silicon nitride films, reducing defect rate.
Ion Implantation: Cools ion sources and accelerator electrodes to stabilize ion beam energy and implantation depth consistency.
2. Perfluoropolyether (PFPE): The Ideal Cooling Fluid for Semiconductor Process Chiller
Perfluoropolyether (PFPE) is a high-molecular fluorinated compound composed of Carbon, Fluorine and Oxygen atoms. With fully fluorinated molecular structure, it features extreme chemical inertness, superior electrical insulation and wide-range thermal stability. PFPE has become the premium dedicated cooling fluid for high-end Semiconductor Process Chiller, especially suitable for stringent requirements of DUV and EUV advanced processes.
2.1 Molecular Structure Advantage
The core performance of PFPE derives from the perfluoroether repeating unit (-CF₂-O-CF₂-). The C-F chemical bond has ultra-high bond energy with excellent molecular stability. Without active hydrogen or chlorine atoms, PFPE avoids chemical corrosion, decomposition and impurity precipitation fundamentally, fully meeting ultra-clean and high-compatibility standards of the semiconductor industry.
2.2 Key Performance Characteristics of PFPE
Extreme Chemical Inertness & Material Compatibility
PFPE resists strong acid, strong alkali, oxidants and most organic solvents. It is compatible with 316L stainless steel, FKM/EPDM seals, PFA/PVDF pipelines used in Process Chiller. No swelling, dissolution or precipitation occurs after long-term circulation over 1000 hours, maintaining long-term pipeline cleanliness.
Superior Electrical Insulation
Volume resistivity ≥ 10¹⁴ Ω·cm, dielectric strength ≥ 60kV/2.5mm. Far better than DI water and silicone oil, PFPE can directly contact live components such as lithography light sources and RF electrodes without short-circuit or leakage risk, supporting direct liquid cooling solutions.
Ultra-Wide Temperature Thermal Stability
Stable operating temperature range: -80℃ ~ +260℃, pour point as low as -97℃, boiling point 200~270℃. It maintains excellent fluidity at ultra-low temperature and no carbonization or volatilization at high temperature, perfectly adapting to EUV low-temperature (-10℃) and etching high-temperature (80℃) working conditions. Thermal conductivity 0.07~0.09W/(m·K) and specific heat capacity ≥ 1.0kJ/(kg·K) ensure stable heat transfer efficiency.
Low Volatility, Environmental Safety & Long Service Life
Extremely low vapor pressure reduces volatilization loss, achieving 3~5 years of maintenance-free service in sealed circulation systems. It has ODP=0, low GWP (<150), fully compliant with REACH, RoHS and SEMI S2 industry standards. Non-toxic and non-irritating, it is suitable for semiconductor cleanroom environments.
2.3 Main PFPE Grades for Semiconductor Chiller
Typical semiconductor-grade PFPE cooling fluids include Solvay Galden, 3M Novec and domestic high-purity PFPE series. Different grades are selected according to boiling point and temperature range to match DUV/EUV Chiller:
Low-temperature Grade: Boiling point 200℃, pour point -97℃, suitable for DUV lithography and etching processes.
High-temperature Grade: Boiling point up to 270℃, excellent thermal stability, ideal for CVD/PVD thin film deposition.
Domestic Ultra-High Purity PFPE: 99.9999% (6N) purity, metal impurities below 0.1ppb, qualified for 14nm/7nm advanced processes, widely verified by mainstream domestic Chiller manufacturers.
3. Semiconductor Process Chiller and PFPE: Advanced Semiconductor Cooling Solution
3.1 Core Synergy Value
Higher Temperature Control Precision: PFPE features low viscosity and high fluidity, ensuring stable flow and low pressure difference in Chiller circulation loop. Combined with ±0.01℃ high-end Chiller, it keeps temperature fluctuation within ±0.03℃ to meet EUV extreme process requirements.
Long-Term Ultra-Clean Performance: 6N high-purity PFPE cooperates with Chiller ultra-clean loop system to control particle and metal ion content stably after long-term operation, eliminating wafer micro-contamination risks.
Improved Equipment Reliability: Excellent material compatibility prevents pipeline corrosion and seal swelling, supporting 24/7 continuous operation and achieving 99.999% equipment uptime.
3.2 PFPE vs Traditional Cooling Fluids Comparison
| Parameter | PFPE Perfluoropolyether | DI Water | Glycol Aqueous Solution | Silicone Oil |
|---|---|---|---|---|
| Insulation Performance | Excellent | Conductive | Weakly Conductive | Medium |
| Chemical Inertness | Perfect | Average | Poor | General |
| Operating Temperature Range | -80℃ ~ +260℃ | 5℃ ~ 90℃ | -20℃ ~ +120℃ | -50℃ ~ +180℃ |
| Cleanliness Level | Semiconductor 6N Grade | Easy Scaling | Ion Impurities | Precipitation Risk |
| Application Scenario | DUV / EUV Advanced Process | Mature 28nm+ Process | Industrial Cooling | Mid-tier Semiconductor |
4. Market Status & Industry Development Trends
4.1 Current Market Pattern
Semiconductor Process Chiller: The global market is dominated by Japan TAISEI and Germany Lauda. Leading domestic manufacturers include Tongfei Stock, Jingyi Equipment and Envicool, focusing on mass production of DUV-level Chiller. Commercial EUV Chiller is not yet available in China, staying in R&D and prototype verification stage.
PFPE Cooling Fluid: Global market long monopolized by 3M and Solvay. Chinese manufacturers have broken through core technology, realizing mass production of semiconductor-grade PFPE with 6N ultra-high purity. Domestic PFPE has passed certification of mainstream Chiller suppliers and accelerated import substitution.
4.2 Future Development Trends
1.Advanced Process Upgrade Drives High-End Demand: As 3nm/2nm processes develop, EUV Chiller requires -10℃ low temperature and ±0.01℃ ultra-precision control, matching low-GWP, ultra-high-purity PFPE cooling fluid.
2.Accelerated Domestic Substitution: Domestic PFPE manufacturers cooperate with local Chiller brands to build independent semiconductor thermal management supply chains, widely applied in domestic DUV wafer fabs.
3.Low-GWP & Eco-Friendly Upgrade: Global fluorine emission regulations promote low-GWP (<150) PFPE as the mainstream direction. Domestic brands optimize molecular structure to balance environmental performance and thermal management efficiency.
5. Conclusion
Semiconductor Process Chiller is the precision temperature control backbone of wafer manufacturing, while Perfluoropolyether (PFPE) serves as the optimal high-performance cooling medium. The combined solution provides high-precision, ultra-clean and highly reliable thermal management for DUV/EUV lithography, etching and deposition processes, directly affecting chip yield and process capability.
At present, China has achieved localized substitution in DUV Process Chiller and semiconductor-grade PFPE. EUV-level products are in the key breakthrough period. With the advancement of domestic semiconductor industrial chain, low-GWP ultra-high purity PFPE + localized high-end Process Chiller will become the mainstream trend, supporting the independent and controllable development of China's advanced semiconductor manufacturing.
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