Patent ID: 7720631

Claim:
A method for calibrating substrate positioning within a metrology tool, the method performed by the metrology tool and comprising: providing a calibration semiconductor substrate having a surface and a plurality of features on the surface, each feature being positioned on the surface at a first respective point in a first coordinate system of the metrology tool; plotting the position of each feature at a second respective point in a second coordinate system of the metrology tool; generating a translation between the first and the second coordinate systems; providing a second semiconductor substrate having a surface and a plurality of second features on the surface, each second feature being positioned on the surface of the second semiconductor substrate at a third respective point in the first coordinate system; translating the third respective points in the first coordinate system into fourth respective points in the second coordinate system using said translation; moving the second semiconductor substrate into a plurality of substrate positions, each substrate position corresponding to one of the fourth respective points in the second coordinate system; propagating electromagnetic radiation onto at least one of the second features on the surface of the second semiconductor substrate, said propagation causing a photoelectron having a kinetic energy to be emitted from a material within the at least one of the second features; capturing the photoelectron; and determining the kinetic energy of the photoelectron.