Patent ID: 8664102
Filing Date: 2014-03-04
Classification: H01L

Abstract:
1. A method for forming a dual sidewall spacer for seam protection of a patterned structure, comprising: providing a substrate containing a patterned structure on a surface of the substrate; depositing a conformal first spacer layer over the patterned structure, the conformal first spacer layer having a seam propagating through a thickness of the conformal first spacer layer near an interface region of the surface of the substrate and a sidewall of the patterned structure; etching the conformal first spacer layer to form a residual spacer at the interface region, wherein the residual spacer coats less than the entirety of the sidewall of the patterned structure; depositing a second spacer layer on the residual spacer and on the sidewall of the patterned structure not coated by the residual spacer, the second spacer layer being seam-free on the seam of the residual spacer; and etching the second spacer layer to form a second spacer coating the residual spacer and coating the sidewall of the patterned structure not coated by the residual spacer.