Patent ID: 9224661
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A method comprising: depositing a first conformal film over a wafer having a structure thereon, thereby forming a coated structure, the structure including at least one vertical surface and at least one horizontal surface; after depositing the first conformal film, measuring a first critical dimension (CD) of the structure; performing an etch to remove a partial thickness of the first conformal film from each of the at least one vertical surface and at least one horizontal surface such that a portion of the first conformal film remains on each of the at least one vertical surface and the at least one horizontal surface; after performing the etch, measuring a second CD of the coated structure; determining a target first conformal film thickness based on a difference between the first CD and the second CD; and after determining the target first conformal film thickness, determining whether any adjustment in the first conformal film thickness is needed, and if needed adjusting the first conformal film thickness by one of further depositing of the first conformal film or removing at least a partial thickness of the first conformal film.