On the lithography floor, you learn fast that a 0.5°C drift during the photoresist bake can throw overlay off, and a particle spike can scrap a whole lot of wafers. Wafer heating has to be repeatable, clean, and quick—every cycle, every lot. No exceptions.
What matters under the hood
We build custom infrared heaters for wafer processing, pairing short-wave or medium-wave emitters to your thermal budget. Across the bake zone, we target wafer-level uniformity of ±0.1°C, with setpoint response under 2 seconds. The heater body is quartz and high-purity ceramics, and the joints are sealed to keep outgassing and contamination out. In Class 1–100 cleanrooms, we keep particle generation low by design. There’s no direct airflow across the hot zone, and we put in an internal particle trap geometry. Control is closed-loop, using calibrated sensors traceable to wafer-contact measurements, so your soft bake and hard bake profiles stay consistent shift after shift.
Why this matters in photoresist processing
Temperature repeatability is the lever that tightens CD control and cuts rework. With tight thermal uniformity across the wafer and across tools, you get tighter line-width distributions and less chasing around on exposure dose. Fast thermal response shortens bake steps without overshoot, so throughput improves and the films stay protected. Energy use drops, too, because the emitters heat the target, not the whole chamber. Reliability is straightforward: field units run 5,000+ hours with under 5% output drop, and maintenance is mostly planned lamp replacement windows.
The practical details you’ll want to plan for
Installation is tool-specific. Expect a mechanical envelope review for your chamber and a connector plan that matches your machine interface. The system performs best when the reflector geometry and sensor placement stay matched as a set. Swapping components individually will degrade uniformity. For the highest repeatability, pair the heater with a dedicated controller and keep a documented calibration schedule tied to your SPC lot checks.