On the litho floor, one wet step can make or break your yield. Right after cleaning, water marks and leftover moisture aren’t just cosmetic—they seed particles and give you non-uniform photoresist adhesion. Conventional contact drying? You’re risking scratches and particle transfer. The fallout shows up as scrapped wafers and critical dimensions that drift. What matters under the hood We built the non-contact wafer dryer around a short-wave infrared (SWIR) source. It heats volumetrically and fast, so the wafer surface stays untouched. The spec you care about is thermal uniformity: ±0.1°C across the entire wafer plane. That’s not a slide number—we hit it with a closed-loop, chamber-integrated control that maps edge losses and compensates in real time. The unit is cleanroom-compatible down to Class 1, with zero moving parts in the drying zone and a filtration-isolated exhaust path that keeps particle counts below threshold. Run-to-run repeatability on soft bake and hard bake lands within 0.2°C, which protects CD control and sidewall angle. Here’s why it holds up in a high-mix fab: the dryer behaves the same at 300 mm and 200 mm, across oxide, nitride, and metal layers. Non-contact operation kills contact-induced micro-scratches and wipes out the wear parts that eat into maintenance windows. The rapid thermal response shortens the drying and bake cycle, so you gain throughput without blowing your thermal budget. Energy use drops because the lamp heats the target, not the surrounding fixtures. The payoff is fewer defects at inspection, tighter process windows, and schedules you can actually count on. A few practical notes. The lamp needs a clean, filtered power supply and stable cooling water conductivity to hold the optical window temperature. Integration is straightforward into most wet benches, but the optical path has to be aligned within 0.5 mm to keep uniformity intact. Before you commit, run a quick qualification to map your exact substrate stacks and confirm the bake profile against your resist specs.