The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jan. 10, 2012
Filed:
Dec. 28, 2004
Jun Seok Lee, Goyang, KR;
Jun Seok Lee, Goyang, KR;
Dongbu Electronics Co., Ltd., Seoul, KR;
Abstract
The present disclosure provides an exposure method for a semiconductor device, in which whether a specific pattern corresponds to a sparse area or a dense area is decided to employ a specific phase-shift mask and by which critical dimension uniformity and resolution of the pattern are enhanced. One example method includes defining a hole area for a plurality of holes into a dense area and a sparse area, coating a photoresist layer on a substrate having a plurality of elements formed thereon, carrying out a first exposure on the photoresist layer using a first photomask having patterns corresponding to the dense and sparse areas, respectively, and carrying out a second exposure on the photoresist layer using a second photomask having at least two halftone layers provided to portions corresponding to the dense and sparse areas, respectively wherein the at least two halftone layers differ from each other in transmitivity, respectively.