Patent ID: 9163935
Filing Date: 2015-10-20
Classification: G01B,G03F

Abstract:
1. A device manufacturing method, comprising: measuring on a substrate a property of a first overlay marker that depends on a transverse profile of the first overlay marker; measuring on the substrate a property of an alignment marker that depends on a transverse profile of the alignment marker; determining, from the measured property of the first overlay marker, information relating to the transverse profile of the first overlay marker; determining, from the measured property of the alignment marker, information relating to the transverse profile of the alignment marker; measuring the position of the alignment marker on the substrate using an alignment system and the determined information relating to the transverse profile of the alignment marker; aligning the substrate using the measured position of the alignment marker; printing a second overlay marker on the substrate; and measuring a lateral overlay on the substrate of the second overlay marker with respect to the first overlay marker using the determined information relating to the transverse profile of the first overlay marker, wherein the first overlay marker comprises a first overlay grating having a first pitch and the alignment marker comprises an alignment grating having a second pitch, such that the first pitch and the second pitch are different, and wherein the alignment grating and the first overlay grating deform differently.