Is the humidity of compressed air high in the semiconductor industry?

Is the humidity of compressed air high in the semiconductor industry?

In semiconductor manufacturing, compressed air serves as an indispensable power source and process gas. As for the question “Is the humidity of compressed air high in the semiconductor industry?”, the answer is clear:The semiconductor industry imposes extremely stringent requirements on the humidity of compressed air; high-humidity environments are absolutely unacceptable.Conversely, the system must supply ultra-dry compressed air to ensure process stability and maximize the yield of the final product.

Why does semiconductor manufacturing require ultra-dry compressed air?

Moisture can give rise to a variety of critical issues in microfabrication environments, primarily manifesting in the following ways:

• Preventing wafer corrosion and oxidation:The linewidths of semiconductor chips have reached the nanometer scale. Even trace amounts of moisture adhering to the wafer surface can readily react with process gases, leading to oxidation or corrosion of metal interconnects and resulting in outright chip failure.
• Avoid particulate contamination:Moisture is an excellent solvent and carrier. If compressed air contains moisture, it can dissolve and carry rust, impurities, or residual oil from the piping, depositing them onto the delicate wafer surface and creating particulate contamination that is difficult to remove.
• Ensuring the stable operation of pneumatic equipment:Precision equipment such as lithography tools and etching machines contains a large number of pneumatic components. Moisture condensation can cause valves to seize, cylinders to wear, and even trigger malfunctions in the control system, thereby compromising the continuity of the production line.

Humidity Standards for Compressed Air in the Semiconductor Industry

In the industrial sector, the humidity of compressed air is typically expressed in terms ofPressure Dew Point (PDP)It is used for measurement. The lower the pressure dew point, the drier the air. While typical industrial applications may only require a pressure dew point between 0°C and 10°C, the standards in the semiconductor industry are far more stringent.

Under normal circumstances, semiconductor manufacturing requires the pressure dew point of compressed air to reach-40℃The following. In core process steps such as lithography and ion implantation, the pressure dew point is even required to be as low as-70℃or lower, to ensure that the gas contains virtually no free water.

How can compressed air humidity be effectively controlled?

To meet extremely low humidity requirements, semiconductor manufacturing facilities must equip their compressed air systems with a comprehensive moisture removal and purification solution:

• High-efficiency drying equipment:Typically, heatless regeneration or mildly heated regeneration adsorption dryers are employed. These units utilize desiccants such as activated alumina or molecular sieves to deeply adsorb water vapor from the air, achieving extremely low pressure dew points.
• Multi-stage filtration system:Equipping the dryer with precision filters at both the inlet and outlet not only removes moisture but also captures particulates, oil mist, and gaseous contaminants, ensuring high‑purity gas.
• Clean pipeline material:Pipes conveying extremely dry air typically use stainless steel with a specially treated inner surface to prevent the pipe itself from rusting and generating moisture and impurities.
• Real-time online monitoring:High-precision online dew-point analyzers are installed at critical nodes in the pipeline network to monitor humidity changes in real time, 24 hours a day. If the dew point deviates from the norm, the system immediately triggers an alarm and activates the backup drying equipment.

Conclusion

In the semiconductor industry, compressed air must not only be low in humidity but also achieve an extremely dry state. Rigorously controlling the moisture content of compressed air is a critical foundation for ensuring the precision of chip‑manufacturing processes, improving product yield, and extending the service life of expensive equipment.