Patent ID: 7517638
Filing Date: 2009-04-14
Classification: H01L,Y10S

Abstract:
1. A method of manufacturing a semiconductor apparatus comprising: providing a film to be processed on a substrate, wherein the film to be processed has a varying thickness and the substrate has a uniform thickness; providing a first dielectric mask material film on said film to be processed, the first dielectric mask material film having a dielectric constant lower than silicon dioxide and a heatproof temperature of about 350 degrees Centigrade; forming a second mask on the first dielectric mask material; providing a resist film on the second dielectric mask material film; forming a first vertical aperture pattern on said resist film; using said resist film as a mask; etching said first dielectric mask material film to form an open pattern using the mask, said open pattern being formed with tapered sides such that a bottom of said open pattern is narrower than a first vertical aperture pattern side of said open pattern; and forming a second vertical aperture pattern in said film to be processed by etching said film to be processed, wherein the bottom of the open pattern is formed at a desirable micro dimension exceeding capabilities of lithography techniques.