Patent ID: 7561282

Claim:
A method of determining a characteristic of a plurality of periodic structures using a scatterometry metrology tool having two or more measurement modules for generating two or more optical beams, the method comprising: providing a first periodic target that is formed from a plurality of features and is selected from a group consisting of a periodic critical dimension (CD) target and a periodic overlay target; providing a second periodic target that is formed from a plurality of features and is selected from a group consisting of a periodic critical dimension (CD) target and a periodic overlay target, wherein the first and second periodic targets are disposed on a same substrate and a center of the first periodic target has a distance from a center of the second periodic target and such distance substantially matches a bore distance between a first and a second measurement module of the scatterometry metrology tool; and obtaining a first spectra from the first periodic target using the first measurement module while substantially simultaneously obtaining a second spectra from the second periodic target; and analyzing the first spectra to determine a first characteristic of the first periodic target and analyzing the second spectra to determine a second characteristic of the second periodic target, wherein the first and second characteristics are each selected from a group consisting of an overlay value, a CD value, and a profile value.