Patent ID: 9224636
Filing Date: 2015-12-29
Classification: H01L

Abstract:
1. A method, comprising: forming an opening in a substrate, the opening completely extending through the substrate, wherein a recast material is formed on sidewalls of the substrate exposed by the opening; applying a first chemical in the opening to remove the recast material, wherein a residue of the first chemical remains on portions of the sidewalls after the applying of the first chemical; and applying a second chemical in the opening to remove the residue of the first chemical, wherein the second chemical is different from the first chemical, wherein the second chemical contains a first component being substantially inactive with the substrate and a second component being substantially active with the material of the first chemical, wherein the first component is selected from the group consisting of helium, neon, argon, krypton, xenon, and radon, and the second component comprises hydride.