Patent ID: 7921386
Filing Date: 2011-04-05
Classification: G03F,H01L

Abstract:
1. A method for fabricating a semiconductor device in which a plurality of mask patterns are used to form a pattern image of an area greater than the size of the mask patterns, the method comprising the steps of: (a) providing, on one mask pattern, a first pattern portion corresponding to a main mark of a first measurement mark formed from a combination of the main mark and a sub mark and a second pattern portion corresponding to a sub mark of a second measurement mark having a same configuration as that of the first measurement mark and positioned at a position different from that of the first measurement mark; (b) providing, on another mask pattern, a third pattern portion corresponding to the sub mark of the first measurement mark and a fourth pattern portion corresponding to the main mark of the second measurement mark; (c) carrying out exposure transfer of the one mask pattern using an exposure apparatus such that the first and second pattern portions respectively create measurement mark patterns within an overlapping exposure region to form the main mark of the first measurement mark and the sub-mark of the second measurement mark in the overlapping exposure region; (d) positioning the another mask pattern for exposure and measuring displacement of the positions of the third and fourth pattern portions of the another mask pattern relative to the main mark of the first measurement mark and the sub-mark of the second measurement mark, respectively; and (e) carrying out exposure transfer of the another mask pattern using the exposure apparatus such that the third and fourth pattern portions create measurement mark patterns within the overlapping exposure region to respectively form the sub-mark of the first measurement mark and the main mark of the second measurement mark within the overlapping exposure region.