Photoresist pre bake infrared heater

Fri, 05 Jun 2026 04:28:02 +0800

On the fab floor, you know the stakes. A 1°C swing during photoresist soft bake can scrap a 300mm wafer before you even get to exposure. Conventional hot plates fight edge roll-off, and thermal lag keeps creating repeatability headaches lot-to-lot. You need a heat approach that keeps pace with spin coating and lands on target with lithography. What matters under the hood We run photoresist pre-bake with infrared heaters: rapid, radiative heat with tight temperature control. Short-wave IR elements respond in sub-second time, so the lag that drives within-wafer non-uniformity is gone. Wafer-level uniformity hits ±0.1°C across the full surface, and setpoint repeatability holds within ±0.2°C shift-to-shift. These heaters sit comfortably in Class 1–100 cleanrooms, with zero particle excursions and low outgassing. Closed-loop control keeps the thermal budget stable, so critical dimensions stay in spec after soft bake and the exposure that follows. Why this lands in photoresist processing Soft bake is where solvent removal and film stress get set. With IR, the energy goes straight into the resist, not the carrier, so solvent evaporates faster without overshoot. You get consistent thickness, lower defect density, and cleaner line-edge roughness. The system runs 24/7 with minimal maintenance, draws less energy than convection tools, and cuts cycle time without adding operating cost. What you need to watch IR performance hinges on emissivity and reflectivity, so stacks with high metal content may need setpoint recalibration and a rebalance of zone power. Installation requires clear line-of-sight and clean alignment to avoid hot spots. There’s a short commissioning period to map emissivity and tune zone profiles, but once that’s done, the process window opens up and the bakes stay stable and repeatable, day after day.

Pre on Professional IR Heat Solutions

Photoresist pre bake infrared heater