Patent ID: 7273761
Filing Date: 2007-09-25
Classification: G01B,G03F,Y10S

Abstract:
1. A method for determining field-to-field alignment, comprising: exposing a first scribe pattern from a mask on a resist over a scribe lane between a first field and a second field on a wafer, wherein the first scribe pattern comprises: stepping the mask from the first field to the second field; exposing a second scribe pattern from the mask on the resist over the scribe lane, wherein the second scribe pattern comprises: developing portions of the resist over the scribe exposed according to the first outer pattern, the first inner pattern, the second outer pattern, and the second inner pattern; and etching the scribe to form (1) a first ring from the first outer pattern and the first inner pattern, and (2) a second ring from the second outer pattern and the second inner pattern.