Patent ID: 6373576
Filing Date: 2002-04-16
Classification: G01N,H01L

Abstract:
A method for representing the concentration of a component of a film used in the manufacture of a semiconductor device, comprising,forming a predetermined thickness of the film on a surface of a semiconductor test wafer, wherein the film component is a compound containing a group III or a group V element, the film having a first known concentration of the component, the wafer surface having a pattern underlying the film that affects the intensity of light reflected from the wafer, detecting monochromatic light reflected from an array of points on the wafer surface in the region of the pattern, assigning an integer value to the intensity of the reflected light for each point, forming an initial image histogram for the integer values of the intensity of the reflected light, and recording the peaks of the image histogram for characterizing the concentration of the component of the film formed on the underlying pattern.