Sustainable fab manufacturing solutions

Thu, 16 Jul 2026 02:48:09 +0800

Why we’re switching to IR curing in lead-free fabs

Most semiconductor fabs are finally ditching those old convection ovens and solvent-heavy drying methods. It’s about time. We’re seeing a big move toward infrared (IR) curing because it actually hits those “green” and lead-free targets without slowing down the line. Here is how the physics actually works. Think about hot air. It’s slow. You have to heat the air, then the walls of the chamber, and then finally the part. IR is different. It shoots energy straight into the substrate. When you’re dealing with lead-free soldering or photoresists, you can’t just blast it with heat or you’ll warp the wafer. IR lets us pick specific absorption bands. It’s like a surgical strike—you get the heat exactly where it needs to be at the interface, while the rest of the environment stays chill. Then there’s the power bill. Traditional drying is a nightmare of massive heaters and blowers humming 24/7. It’s a waste. IR lamps, on the other hand, hit their operating temp in seconds. You flip the switch, they’re ready, and you start curing. No more waiting around for long warm-up cycles that eat kilowatts for breakfast. Plus, since you aren’t blowing forced air all over the place, you don’t have to worry about random contaminants drifting into your cleanroom. It’s all contained. But it’s not all magic. IR is fast, but you have to be careful. If you use high-intensity short-wave IR, you can run into “skinning.” That’s when the top layer cures so fast it traps solvents underneath. Not a good look. You have to really nail the lamp array and the conveyor speed to make sure the heat gets all the way through. And if your cooling system is too small for the heat bouncing off the wafer, your process temperature will start to drift. We’re leaning into IR because it just makes sense for the planet and the bottom line. It gets rid of the toxic solvents and slashes the electricity we’re pulling from the grid. Simple as that.

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Sustainable fab manufacturing solutions

Why we’re switching to IR curing in lead-free fabs