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:
May. 29, 2001
Filed:
Sep. 13, 1999
Claymens Lee, Kaohsiung Hsien, TW;
United Microelectronics Corp., Hsinchu, TW;
Abstract
A method to lower the parasitic capacitance is described, in which a low dielectric constant air-gap is formed in the dielectric layers at both sides of the gate to lower the parasitic capacitance present between the gate and the source/drain region. The air-gap is formed by forming spacers at both sides of the gate, followed by forming a first dielectric layer with its height lower than the top of the spacers. Thereafter, the spacers are removed by wet etching to form a hole with its top narrower than its bottom. A second dielectric layer is further formed, by a deposition technique with a weaker step coverage capability, to encapsulate the hole and to cover the substrate, wherein the encapsulated hole is the air-gap.