Precision IR sensor for wafer

Mon, 20 Jul 2026 11:10:01 +0800

Why we’re switching to IR curing for lead-free chips

The semiconductor world is finally moving away from those old-school convection ovens. Most of us are switching over to Infrared (IR) curing, and it’s not just about following the new “eco-friendly” or lead-free rules—though that’s a big part of it. It’s about how the heat actually works. Instead of blowing hot air around a room, IR uses electromagnetic radiation. It doesn’t mess around with the air; it just hits the target directly. The energy side of things Think about a convection oven. You have to heat up the entire chamber, the air, the walls… everything. It’s a waste. IR is different. We can tune it to hit the specific absorption bands of the photoresist or the wafer itself. It’s direct. No massive heating elements running 24/7 just to keep the air warm. You get a much faster ramp-up, which means your electricity bill stays lower and your wafers move through the line quicker. Getting the temperature just right Here’s the tricky part: lead-free solders and resists are finicky. They have a very narrow “sweet spot” for temperature. If you overshoot it even by a little, you’re looking at warped wafers or fried circuitry. That’s a nightmare. With IR, we use sensors that watch the wafer surface in real-time. The moment the temperature shifts, the sensors tell the power controller to dial back the lamps. There’s no “thermal lag” like you get with air ovens, where the air is still hot even after you’ve turned the heat off. It’s just tighter control. Cleaning up the floor Plus, your fab gets a lot cleaner. You can ditch those huge ventilation ducts and the VOC scrubbers that usually come with high-heat air systems. The whole setup takes up way less space. But, it’s not all magic. You do have to watch out for the “edge effect.” Since IR is line-of-sight, the edges of a wafer can heat up faster than the center if your lamps aren’t set up perfectly. You have to be really careful with the lamp geometry and the distance from the 300mm surface. If the spacing is off, you’ll get hot spots. And a hot spot is a great way to ruin an entire batch.

High precision temperature heater

Wed, 17 Jun 2026 15:22:04 +0800

On the lithography floor, that 90°C soft bake isn’t just a setting on the panel. It’s the line in the sand between a photoresist profile that holds shape and a wafer that ends up in the scrap bin. A 0.5°C drift across the chuck? That’s enough to tilt CD uniformity and push line-width control right out of spec. In this business, temperature isn’t just heat—it’s a process variable that has to stay inside a tight thermal budget, lot after lot. Here’s what matters under the hood. We run high-precision heaters that hold wafer-level uniformity within ±0.1°C, with setpoint repeatability that keeps the bake inside the window for consistent adhesion and etch selectivity. The hardware is built for cleanroom duty—Class 1 to 100—and it’s engineered so temperature transitions don’t generate particle events. We use short-wave infrared elements that respond quickly, so ramp-up and soak are under tight control. The hot zone stays isolated, which protects the chamber from outgassing and contamination. In production, that precision shows up where it counts. Fewer excursions. Less scrap. Cycle times that behave predictably. Soft bake, hard bake, and post-bake steps stay stable enough to support shrinking nodes, without chasing thermal drift from lot to lot. You end up with higher effective yield and far less rework. Energy use stays lean because heating is efficient and overshoot is minimized. The platform is rated for 24/7 operation, so unplanned downtime stays close to zero. A few practical notes before you spec it in. These heaters integrate cleanly, but they need a stable power supply and a chuck with matched thermal mass to hit the stated uniformity. Plan a short commissioning run to tune PID to your chamber dynamics, and verify grounding and shielding so EMI doesn’t bleed into sensitive metrology zones. Once you get the alignment right, the process window opens up and the line runs to spec—without the temperature-driven variability that throws away wafers.

Precision on Infrared Heat Limited

Precision IR sensor for wafer

Why we’re switching to IR curing for lead-free chips

High precision temperature heater