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:
Aug. 27, 2002
Filed:
Aug. 31, 2000
Chih-Chien Liu, Taipei, TW;
Jui-Tsen Huang, Taipei, TW;
Yi-Fang Cheng, Yunglin Hsien, TW;
Ming-Sheng Yang, Hsinchu, TW;
United Microelectronics Corp., Hsinchu, TW;
Abstract
A method of forming a dual damascene structure. A first dielectric layer and a second dielectric layer are sequentially formed over a substrate. A first photoresist layer is formed over the second dielectric layer. Photolithographic and etching operations are conducted to remove a portion of the second dielectric layer and the first dielectric layer so that a via opening is formed. A conformal third dielectric layer is coated over the surface of the second dielectric layer and the interior surface of the via opening. The conformal third dielectric layer forms a liner dielectric layer. A second photoresist layer is formed over the second dielectric layer and then the second photoresist layer is patterned. Using the patterned second photoresist layer as a mask, a portion of the second dielectric layer is removed to form a trench. The patterned second photoresist layer is removed. Conductive material is deposited over the substrate to fill the via opening and the trench. Finally, chemical-mechanical polishing is conducted to remove excess conductive material above the second dielectric layer.