Industrial Cleaning vs Semiconductor Cleaning
Learn how semiconductor cleaning differs from industrial cleaning in goals, tolerance, ultrasonic energy, materials, process control, and equipment designs.
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.