Patent ID: 7368416
Filing Date: 2008-05-06
Classification: H01L

Abstract:
1. A method of removing metal-containing material, comprising: exposing the metal-containing material to a solution comprising at least about 10 weight percent H wherein the metal-containing material is received between polycrystalline silicon and borophosphosilicate glass, one side of the metal-containing material being directly against the polycrystalline silicon and an opposing side of the metal-containing material being directly against the borophosphosilicate glass; wherein the solution has a selectivity for removing the metal-containing material relative to the polycrystalline silicon and the borophosphosilicate glass of at least 600:1; and wherein the exposing of the metal-containing material to the solution removes the metal-containing material from between the polycrystalline silicon and the borophosphosilicate glass to form a space between the polycrystalline silicon and the borophosphosilicate glass.