Patent ID: 6678038
Filing Date: 2004-01-13
Classification: G03F

Abstract:
In a microlithography method performed using a microlithography apparatus including a wafer stage and a holding member configured to hold a substrate relative to the wafer stage, a method for measuring a tool-induced shift, comprising:(a) providing the holding member with rotatability in increments of 90Â°, relative to the wafer stage, from a first rotational position to a second rotational position; (b) at the first rotational position, determining a respective location of an alignment feature on the holding member; (c) rotating the holding member about a rotational axis to the second rotational position; (d) at the second rotational position, determining a respective location of the alignment feature; and (e) comparing the respective location of the alignment feature determined at the first rotational position with the respective location of the alignment feature at the second rotational position and determining a corresponding tool-induced shift from a detected difference between the respective locations.