From Fluid Handling to Dose Control: How Valve Technology Evolved from Process Component to Dose-Control Enabler

By JEFF DEWITT, Lead Applications Engineer, Swagelok Company

As device architectures shrink and move into 3D, the process windows for atomic layer processes have narrowed to the point where valve performance has become a system-level concern. Jeff DeWitt of Swagelok traces how semiconductor fluid systems have evolved through three eras, purity, performance and precision, each driven by the industry’s most pressing process challenge at the time.

In the first era, valves were judged as fluid-system components on leak tightness, diaphragm integrity, cycle life and cleanliness. As ALD moved into high-volume manufacturing, the focus shifted to throughput and yield, with flow-path geometry, conductance, purgeability and thermal stability shaping how consistently films formed across wafers and chambers.

The emerging third era, DeWitt argues, is about controlling the dose itself: the number of moles delivered during each valve-open pulse in advanced ALD and atomic layer etch. At millisecond pulse times, small differences in actuation and conductance drift become critical, and no valve controls dose on its own. Dose control, he concludes, has become a system outcome and the next frontier in semiconductor fluid delivery.

Click here to read the full article in Semiconductor Digest magazine.

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