Patent ID: 8514374
Filing Date: 2013-08-20
Classification: G03F

Abstract:
1. A method of providing improved alignment for a photolithographic exposure, comprising: a) identifying a first exposure tool and a first chuck used in a reference photolithographic exposure of a first material layer on a substrate including a semiconductor, the first chuck being one of a plurality of chucks usable with the first exposure tool; b) identifying a second exposure tool and a second chuck used in a current photolithographic exposure of a second material layer on the substrate; c) computing alignment correction information specific to each of the identified first exposure tool, the first chuck, the second exposure tool and the second chuck, wherein obtaining alignment correction information comprises: d) using the alignment correction information specific to each of the identified first exposure tool, the first chuck, the second exposure tool and the second chuck, aligning the semiconductor substrate to the second exposure tool and the second chuck, so as to compensate for alignment error between the first and second exposure tools and the first and second chucks; wherein using the alignment correction information comprises: