Patent ID: 6455130
Filing Date: 2002-09-24
Classification: H01L,Y10T

Abstract:
A process for forming a multidensity nanoporous dielectric coating on a substrate having raised pattern lines which comprisesa) blending at least one alkoxysilane with a relatively high volatility solvent composition, a relatively low volatility solvent composition and optional water thus forming a mixture and causing a partial hydrolysis and partial condensation of the alkoxysilane; b) depositing the mixture onto a substrate having a raised pattern of lines such that the mixture is positioned both between the lines and on the lines, while evaporating at least a portion of the relatively high volatility solvent composition; c) exposing the mixture to a water vapor and a base vapor; and d) evaporating the relatively low volatility solvent composition, thereby forming a relatively high porosity, low dielectric constant, silicon containing polymer composition positioned between the raised lines and a relatively low porosity, high dielectric constant, silicon containing polymer composition positioned on top of the lines.