Out on the fab floor, you learn to sweat the small stuff. A sub-0.1°C drift during soft bake can tilt critical dimension bias and scrap a whole lot of wafers. Traditional hot plates fight thermal inertia. NIR wafer dryers don’t. What we built, and why it matters We put this NIR dryer together around near-infrared radiant heating. The point is direct energy transfer into the photoresist layer, fast. That gives us wafer-level uniformity within ±0.1°C across the entire bake profile, with repeatability tight enough to keep within-lot variation below process control limits. It runs in Class 1–100 cleanrooms with zero particle generation, confirmed by in-situ monitoring. The platform is built for 24/7 duty, with zero unplanned downtime in pilot runs and a service life measured in tens of thousands of cycles. Why it fits lithography realities In lithography, soft bake and hard bake set photoresist viscosity, pull the solvent out, and define the sidewall profile. With this NIR dryer, we’re stabilizing temperature at the wafer surface, not at a platen. The thermal budget stays consistent from the first lot to the fiftieth. You get shorter bake steps without overshoot, lower energy draw, and fewer rejects you can trace back to thermal nonuniformity. The process window opens up, and line-of-sight integration into existing tracks stays straightforward. Here is what you need to plan for NIR needs direct line-of-sight to the wafer and a controlled reflective path. Stacked carriers or non-standard chucks can shadow the substrate. Plan on a dedicated fixture, and line it up with your track layout. Once aligned, the dryer delivers repeatable bake performance with minimal maintenance. But the setup tolerance is stricter than you get with contact-based systems.