Industrial Cleaning vs Semiconductor Cleaning

1. The Fundamental Difference in Cleaning Goals: From “Clean” to “Zero Risk”

In industrial cleaning, the criteria for evaluating cleaning performance usually include:

• Whether the surface is free of oil contamination
• Whether it affects subsequent assembly or coating
• Whether the appearance meets customer requirements

However, in the semiconductor industry, the cleaning goal is no longer just to make the surface “look clean.” It must meet the following conditions:

• No nanoscale particles remaining on the surface
• No metal ion contamination introduced
• No damage to microstructures
• No risk to the next process step

2. The Role of Cleaning in the Process Is Completely Different

In general industry, cleaning is often placed before or after a process, with a relatively simple and clear purpose.

However, in semiconductor processes, cleaning is a necessary step that appears repeatedly, such as:

• Surface cleaning before and after photolithography
• Residue removal after etching
• Surface adjustment before thin-film deposition
• Particle removal after CMP polishing

3. Ultrasonic Cleaning: Strong in Industry, but a High-Risk Source in Semiconductors

In industrial cleaning, the design logic of ultrasonic cleaning is usually:

• Higher power means faster cleaning
• Stronger cavitation means better contamination removal

However, in semiconductor cleaning, this logic may create risks:

• Excessive cavitation may damage fine circuits
• Attached bubbles may affect surface uniformity
• Unstable energy distribution may cause local damage

Therefore, semiconductor cleaning often uses:

• High-frequency megasonic design
• Low power density control
• Precise liquid level and temperature control
• Strict suppression of bubble formation

This is why many industrial ultrasonic cleaning systems cannot be directly applied to semiconductor cleaning processes.

4. Differences in Material and System Design Requirements

In industrial cleaning equipment, design priorities usually focus on:

• Structural strength
• Durability
• Ease of maintenance

However, semiconductor cleaning equipment places greater emphasis on:

• Risk of ion leaching from the material itself
• Chemical compatibility
• Whether the flow field is uniform and free of dead zones
• Whether the system provides traceability and consistency

Common tank materials for semiconductor cleaning include:

• Quartz
• High-purity fluoropolymer materials such as PFA and PTFE
• High-grade stainless steel under specific conditions

These choices are not made simply because they are “high-end,” but to reduce any variables that may affect the process.

5. From the Equipment Perspective, the Real Difference Is “Tolerance”

When shifting from industrial cleaning to semiconductor cleaning, the biggest change can be summarized in one key concept:

Tolerance approaches zero.

In industrial cleaning, equipment may allow minor adjustment and experience-based compensation.

However, in semiconductor cleaning, every parameter must be:

• Quantifiable
• Repeatable
• Verifiable

This is why specification documents for semiconductor cleaning equipment are usually thicker and process conditions are more strictly defined, because the equipment itself is part of process control.

The difference between semiconductor cleaning and industrial cleaning is not simply about higher precision or equipment grade. Cleaning must be treated as part of process control.
The cleaning method, ultrasonic energy, material selection, and system stability all directly affect the reliability and yield of downstream processes. Therefore, every design decision must be based on reducing process risk.
YONG JI Enterprise can assist in evaluating suitable cleaning methods and equipment configurations according to process requirements, contamination risks, and cleaning applications.
For cleaning applications entering the semiconductor field, we help establish stable, repeatable, and process-compliant cleaning solutions.

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永技企業有限公司

YONG JI Enterprise Co., Ltd.

243新北市泰山區中港西路137-10號

No. 137-10, Zhonggang W. Rd., Taishan Dist., New Taipei City 243079, Taiwan (R.O.C.)

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