Patent ID: 6503850
Filing Date: 2003-01-07
Classification: B01J,C01B,H01L

Abstract:
A process for forming a nanoporous dielectric coating on a substrate which comprises the steps of:(a) blending at least one alkoxysilane with a high volatility solvent composition, a low volatility solvent composition, and optional water, wherein the mole ratio of water to silane is from about 0 to about 2, to thus form a mixture having a pH of about 2 to about 5, and causing a partial hydrolysis and partial condensation of the alkoxysilane; (b) adding a sufficient amount of a base to the result of step (a) to raise the pH of the mixture to about 8 or above; (c) depositing the raised pH mixture resulting from step (b) onto a substrate while evaporating at least a portion of the high volatility solvent composition; (d) exposing the result from step (c) to sufficient water vapor to cause gellation; and (e) evaporating the low volatility solvent composition.