Patent ID: 8193648

Claim:
A method for detecting errors of exposed positions of a pre-layer and a current layer by an integrated alignment and overlay mark, the method comprising steps of: forming an alignment mark of the integrated alignment and overlay mark on the pre-layer, and the alignment mark being formed in a shot region; forming an overlay mark of the integrated alignment and overlay mark on the current layer, and the overlay mark being formed in the shot region and inside the alignment mark; and making measurements of orientation and/or gap between the alignment mark and the overlay mark for detecting errors of exposed positions of the pre-layer and the current layer; wherein the step of making measurements of orientation and/or gap between the alignment mark and the overlay mark further includes steps of: making measurements of a first position on a first axis of the alignment mark, and a first position on a second axis of the alignment mark, making measurements of a second position on the first axis of the overlay mark, and a second position on the second axis of the overlay mark; and determining values of an error of the first position of the first axis and the second position of the first axis relative to a first predetermined error range, and determining values of an error of the first position of the second axis and the second position of the second axis relative to a second predetermined error range.