Organosilicate resins as hardmasks for organic polymer dielectrics in fabrication of microelectronic devices
This invention is directed to a method of making a composition in which a silane having an unsaturated group and a silane having an aromatic group are hydrolyzed. In this method the more highly reactive silane is continuously added during the hydrolysis reaction of the less reactive silane. The composition can be used in the fabrication of microelectronic devices, particularly as hardmasks or etchstops.
1. A method of making a composition which composition comprises the hydrolyzed or partially hydrolyzed product of a combination of silanes comprising (a) an alkoxysilane or acyloxy silane having at least one hydrocarbon group attached to the Si atom which hydrocarbon group contains a non-aromatic, unsaturated carbon to carbon bond, and (b) an alkoxysilane or acyloxysilane having at least one hydrocarbon group attached directly to the Si atom which hydrocarbon group includes an aromatic ring, wherein the method comprises a hydrolysis reaction of components (a) and (b) characterized in that the more highly reactive component of components (a) and (b) is continuously added during the hydrolysis reaction to a solution comprising the other component.
2. The method of claim 1 wherein water is also continuously added during the hydrolysis reaction.
3. The method of claim 1 wherein the more highly reactive component is added at a desired addition rate.
4. The method of claim 1 wherein the more highly reactive component is added in uniform portions.
5. The method of claim 2 wherein the more highly reactive component and the water are each added at set addition rates.
6. The method of claim 2 wherein the more highly reactive component and the water are each added in uniform portions.