Semiconductor device for measuring an overlay error, method for measuring an overlay error, lithographic apparatus and device manufacturing method

摘要

A semiconductor device for determining an overlay error on a semiconductor substrate includes a first and a second transistor. Each transistor includes two diffusion regions associated with a gate, the diffusion regions of each transistor being arranged in a first direction. The second transistor is arranged adjacent to the first transistor in a second direction perpendicular to the first direction. The first and second gate each have a non-uniform shape, and the second gate is oriented with respect to an orientation of the first gate in such a way that an effect of an overlay error on a device parameter of the second transistor has an opposite sign in comparison to an effect of the overlay error on a corresponding device parameter of the first transistor.