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. 02, 2002
Filed:
May. 11, 1999
Chien-Hung Chen, Taipei Hsien, TW;
Chung-Yih Chen, Taipei, TW;
Jerry C. S. Lin, Tainan, TW;
Yen-Rong Chang, Taipei Hsien, TW;
Mosel Vitelic, Inc., Hsinchu, TW;
Abstract
This present discloses a method for making a concave bottom oxide within a trench, the steps comprising: providing a semiconductor substrate; forming an insulating layer on the semiconductor substrate; defining the insulating layer to form an opening exposing the surface of the semiconductor substrate; dry-etching the exposed semiconductor substrate within the opening by using the first insulating layer as an etching mask to form a trench; depositing a first oxide layer conformably over the insulating layer, the side-walls and the bottom of the trench; depositing a second oxide layer on the first oxide layer and filling-up the trench surrounded by the first oxide layer; annealing to densify the first and second oxide layers; etching-back the first and second oxide layer to remove the portion overlying the first insulating layer, and forming a spacer consisting of the residual first oxide layer on the side-walls of the trench, and a concave bottom oxide consisting of the first and second oxide layers on the bottom of the trench.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile