Thermocouple for semiconductor heater

Tue, 30 Jun 2026 04:53:24 +0800

On the fab floor, you don’t need a lecture to understand thermal drift. A soft bake that’s supposed to run at 110°C can slip to 112°C, and you’ll see those critical dimensions move by nanometers before the shift is over. This isn’t theory. It’s scrap. What matters, technically We put a Type K thermocouple straight into the semiconductor heater block, positioned to read the wafer-plane temperature—not the heater skin. That gives closed-loop control with ±0.1°C uniformity across the substrate. The sensor sits in high-purity quartz or a cleanroom-rated metal sheath, with a hermetic feedthrough that keeps particle generation at zero. It takes the rapid thermal ramps and the repeated bake cycles, and it holds up in Class 1–100 environments without outgassing. The output stays stable, 24/7, so your photoresist bake profiles are repeatable—shift after shift. Why this works in lithography In lithography, photoresist bake temperature sets viscosity and thickness, and that directly drives line-width control. With this thermocouple, you keep the thermal budget tight, so soft bake and hard bake recipes run the way they were written—consistently. The payoff is fewer excursions, less rework, and CD performance you can count on. Energy use drops, too, because the controller isn’t chasing setpoints with overshoot. Ramps are faster, soaks are stable, and the process window opens up. A few shop-floor notes The thermocouple is sensitive to mounting tolerance. Use the specified compression fitting and torque; misalignment moves the sensing point and creates a control offset. Make sure the connector type and lead length match your controller input—compensation errors compound fast. After maintenance or a heater swap, give it a short warm-up to stabilize. Plan that into your changeover, and you won’t get caught off guard.

Thermocouple on Pro Quartz Infrared Heating

Thermocouple for semiconductor heater