Patent ID: 6580505
Filing Date: 2003-06-17
Classification: G03F

Abstract:
A mark arrangement for use in measuring the relative position between a first layer and a second layer of a semiconductor device wherein the second layer is formed above the first layer, the mark arrangement comprising:a first mark for measuring the relative position between the first and second layers with respect to a first measurement direction, the first mark including, a first set of periodic test structures positioned along a first scan path, the first set of periodic test structures having a first section formed on the first layer and a second section formed on the second layer; and a second set of periodic test structures positioned along a second scan path, the second set of periodic test structures having a first section formed on the first layer and a second section formed on the second layer, wherein the first section and the second section of the first set of periodic test structures are proximate to the second section and the first section, respectively, of the second set of periodic test structures; and a second mark for measuring the relative position between the first and second layers with respect to a second measurement direction that is substantially orthogonal to the first measurement direction, the second mark including, a third set of periodic test structures positioned along a third scan path, the third set of periodic test structures having a first section formed on the first layer and a second section formed on the second layer; and a fourth set of periodic test structures positioned along a fourth scan path, the fourth set of periodic test structures having a first section formed on the first layer and a second section formed on the second layer, wherein the first section and the second section of the third set of periodic test structures are proximate to the second section and the first section, respectively, of the fourth set of periodic test structures, also wherein the first and second scan paths are substantially orthogonal to the third and the fourth scan paths, respectively, and wherein the periodic test structures on the first layer are visible through the second layer.