Patent ID: 8906760
Filing Date: 2014-12-09
Classification: H01L

Abstract:
1. A method for preparing a spacer on a substrate structure, the method comprising: providing a first structure on a substrate, the first structure being characterized by a first aspect ratio; providing a second structure on the substrate, the second structure being characterized by a second aspect ratio, the first aspect ratio being greater than the second aspect ratio; depositing a conformal spacer material layer over the first structure and over the second structure; performing an aspect ratio dependent deposition process that deposits a protection layer on the conformal spacer material layer via substantially isotropic vapor deposition of the protection layer, the aspect ratio dependent deposition process resulting in a first thickness of the polymer protection layer formed on a top portion of the first structure and a second thickness of the polymer protection layer formed on a top portion of the second structure, the first thickness of the polymer protection layer being greater as compared to the second thickness of the polymer protection layer; and performing a spacer etch process that removes the conformal spacer material layer from the second structure, while retaining the conformal spacer material layer on at least part of the first structure.