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:
Apr. 22, 1997
Filed:
Oct. 30, 1995
Jeong-Seok Kim, Suwon, KR;
Samsung Electronics Co., Ltd., Suwon, KR;
Abstract
In manufacturing a high-integrated semiconductor memory device, there is disclosed a method for forming a trophy-shaped landing pad to a contact hole with a high aspect ratio by using a multiple-step etching process. According to the present invention, a storage node landing pad is formed by the multiple-step etching process and in different profiles via different etching processes from a bit line landing pad, thereby preventing a stringer or a bridge phenomenon occurring between the landing pads. Moreover, the trophy-shaped landing pad is formed by the multiple-step etching process, thereby securing an enough alignment margin and facilitating the manufacturing of 1 Gbit-grade DRAM by lowering the aspect ratio.