There are a growing number of engineers deciding that CNC tube bending is a better option for their production systems versus fitting together or fusing stainless steel tubes or other metals. That’s why we updated our most-popular resource: Time and Cost Savings with...
Multiple industries that move gases from one location to another – or mix different gases – utilize gas cabinets. Depending on the complexity of the gas transportation system, a combination of orbital welding, hand welding and tube bending helps construct a gas...
As you’re likely aware, there’s a lot of competition in all tiers of manufacturing in 2021. Today, we know that a combination of quality and lead time is what customers are looking for. Inventory management and quality assurance in manufacturing are two things...
All About the Wafer Cleaning Process in Semiconductor Manufacturing Services
Silicon wafers are among the most fragile products found in semiconductor manufacturing services. Subject to many different potential concerns, one of the most prominent is surface contamination, which can occur simply as a result of silicon wafers being exposed to organic particles in the air. Due to electrostatic force, contaminants will bond directly to silicon wafers, causing them to function improperly unless thoroughly cleaned prior to implementation.
Fortunately, experts in semiconductor manufacturing services have developed a solution for this all too common issue—here’s how it works.
Step #1: Cleaning with Solvents
When it comes to cleaning the surfaces of silicon wafers, nothing beats the effectiveness of solvents. Acetone is commonly employed for this purpose, as it can easily remove organic residues, oils and more from wafers without causing additional issues. Since solvents themselves can contribute to wafer residue, a two-step process is often employed in which the wafers are cleaned with methanol after being bathed in acetone. Finally, the wafers are rinsed with deionized water and blow-dried with nitrogen.
Step #2: RCA Clean
Though solvents play a crucial role in the silicon wafer cleaning process, an additional RCA clean is also typically performed. This step in the procedure adds a thin layer of oxidation to the silicon, protecting the surface so that buildup of contaminants is no longer able to occur on the actual surface of the wafer. After the RCA bath is complete, the wafers are once again cleaned with multiple changes of deionized water and then rinsed under a constant flow to discourage water residue from sticking to the surface.
Step #3 HF Dip
The third and final step in the wafer cleaning process involves dipping the silicon into hydrofluoric acid (HF), which serves the purpose of removing silicon dioxide from the surface of the chip. Once dipped for a period of two minutes, the chips are then tested for “wettability,” with manufacturers looking for beads to roll off and not stick—an indication of a hydrophobic, oxide-free surface. Hydrofluoric acid is a very dangerous chemical, and great care must be taken throughout this step in the process.
The Importance of Cleanroom Manufacturing for Wafer Cleaning Components
When conducted properly, the wafer cleaning process can be extremely effective—that is, if components being used in the process are designed in a clean environment. Particle-free systems are essential throughout every step of the semiconductor component manufacturing process, from wafer cleaning to the handling of gases/liquids and everything in between. Axenics maintains a Level 100 Cleanroom, ensuring that all weldments, manifolds, gas boxes, tubing kits and other components are free of contamination.
With 30+ years of experience producing particle-free cleanroom welding, piping, tubing, and bends for the semiconductor industry, Axenics helps create solutions for even the most complex challenges faced by today’s engineers.
Contact us today to learn more about our Level 100 Cleanroom, cleanroom welding and how it supports the wafer cleaning process.
Innovations in technology historically occur in waves. Research and development in the semiconductor industry is projected to grow in 2021 and beyond, according to IC Insights, an industry market research firm. The buzz is that while top semiconductor manufacturers...
The semiconductor industry has remained pandemic-proof through 2020 so far. And, the outlook for 2021 looks fantastic with a projected 12% global growth, according to Future Horizons. Axenics is a longtime fabricator of components and a service provider for Tier 1,...