In semiconductor manufacturing sites, some view the cleaning process as the ‘finishing stage’. However, the fact that a single contaminant particle can change the fate of an entire wafer shows that cleaning is not the end of the process, but a variable that determines yield.
The Impact of a Single Contaminant Particle on Yield
In semiconductor manufacturing, contaminant particles reduce yield in ways that cannot be seen with the naked eye. If a single submicron particle lands on a wafer during the photolithography process, the entire die can become unusable. According to Applied Physics USA, this is a real cause that separates a 95% yield from a 75% yield.
As processes move down to 3 nanometers and 2 nanometers, the allowable contamination level becomes even narrower. A single contaminant particle can lead to the disposal of an entire wafer, and the resulting loss can reach millions of dollars. As processes become finer, the role of cleaning is elevated from simply maintaining cleanliness to serving as a line of defense for yield.
No matter how well a cleanroom environment is prepared, particles generated during the process are targets for control, not something that can be considered completely eliminated. Ultimately, a clear trend has taken hold in semiconductor manufacturing sites, where final quality stability is determined by how cleaning equipment removes particles and at which stage it does so.
Structure and Role of Multi Step Cleaning Technology
To effectively remove contaminant particles, a single cleaning method has limitations. This is because the nature of contamination varies, including particles loosely attached to the surface, foreign matter embedded in fine grooves, and residual liquids generated during the process. To address this, multi step cleaning methods are being adopted in the field.
- Micro Bubble is a method in which fine bubbles contact the surface and separate particles without physical impact, making it suitable for removing contamination while minimizing surface damage to precision components.
- Water Jet directly removes surface contamination using a high pressure water stream.
- Air Knife blows away residual moisture after cleaning and prevents contamination from reattaching before the drying stage.
- When the Oven Dry function is added, the process flow from cleaning to drying is completed as one integrated sequence.
Huvics Cleaner System is designed so that this multi step configuration can be applied according to the characteristics of products such as camera modules, sensors, VCM motors, and trays, and it can be selected as either Full Auto or Manual depending on site conditions. When selecting cleaning equipment, the key is not a single performance figure, but a step configuration suited to the contamination type and product shape.
The Link Between Machining Precision and Cleaning Efficiency
Engineers responsible for chip stacking processes know very well how sensitive package thickness variation can be as a variable. In structures where dozens of chips are stacked vertically, such as AI semiconductors or high performance memory, the thickness uniformity and flatness of each layer are directly connected to signal transmission and bonding reliability. When thickness variation accumulates, it can lead to poor electrical connections or heat dissipation issues, which is like planting the seeds of yield loss even before the cleaning stage.
Huvics PKG Grinder uses a high precision Stage and Diamond Wheel to achieve micron level thickness uniformity. It supports a wide range of package types, including FCBGA, WLCSP, QFN/DFN, and Solar Cell, and can reliably process products to the thickness targets required by customers. It supports both Full Auto and Manual modes, ensuring flexibility in production line configuration.
By minimizing quality variation even in high speed processes, it creates the conditions needed to maximize the effectiveness of the subsequent cleaning process. Machining precision determines cleaning efficiency, and cleaning efficiency determines final yield. The significance of the PKG Grinder is confirmed by the fact that these two processes are connected.
When choosing cleaning equipment, many people commonly focus only on cleaning power. However, because the type of contamination, the shape of the product, and the requirements of the subsequent process all differ, the criteria for equipment selection must also change. Understanding the structure in which machining precision supports cleaning efficiency and the cleaning method determines final yield is the starting point for semiconductor process design.
Huvics is an advanced technology company that develops and manufactures automation equipment and
production systems across the semiconductor, LED, Mobile, and Cosmetic industries.
With top talent and continuous technological innovation, we support customers in improving productivity and
securing quality competitiveness.
Huvics Contact
Tel: 031-374-8285
Email: cdpark@huvics.com
