Patent ID: 7249343
Filing Date: 2007-07-24
Classification: H01L

Abstract:
1. A process control method used in a production process of a semiconductor device, comprising the steps of: performing a process over a substrate; measuring an in-plane distribution over the substrate; calculating a model formula of the in-plane distribution from measurement data obtained by measurement; comparing the measurement data with the model formula to calculate a set of parameters of the model formula; storing the parameters as data of the in-plane distribution over the substrate; comparing the measurement data with the model formula to detect measurement data which is inconsistent with the model formula; performing remeasurement for the inconsistent measurement data to update the inconsistent measurement data; and determining an abnormality in a semiconductor device production apparatus from a variation in the stored parameters, wherein the measurement data includes measurement coordinates over the substrate, and the model formula is obtained by modeling the tendency that the in-plane distribution concentrically varies and the tendency that the in-plane distribution varies along a diameter direction and along a tilt of the substrate.