Patent ID: 6310688
Filing Date: 2001-10-30
Classification: G01B

Abstract:
A method for measuring the parameter of a rough film, comprising at least the following steps of:(a) providing a chip with a rough film which includes a concave-convex layer and a bottom layer;(b) choosing a measuring light with wavelength in a certain range, in which said measuring light has the characteristic of being less influenced by the bottom layer;(c) performing measurement to the rough film by an optical instrument and said measuring light with less influence from the bottom layer, and then obtain a measured value which is the parameter of the concave-convex layer;(d) providing a first standard and a second standard, wherein said first standard is well-defined standard optical index and said second standard is a lessen standard optical index;(e) introducing the first standard, the second standard and the measured value into a formula to derive a controlling value, said formula is stated as:Measured value=[(1-controlling value).times.the first standard]+[controlling value.times.the second standard];(f) determining if the controlling value is near to zero, and adjusting the manufacturing process accordingly.