The FLX-2320 is a thin film stress machine. A laser scanner is used to measure the changes in the radius of curvature of the substrate caused by the deposition of a thin film on the wafer. This is accomplished by first measuring the wafer curvature before the film is deposited and then re-measuring the curvature after the film is deposited. A well known mathematical relation is then used to calculate the stress of the thin film.
Qualification Data
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