Patent ID: 6620740
Filing Date: 2003-09-16
Classification: H01L,Y10S

Abstract:
A method of forming an electronic device comprising:providing a first electrode and a doped oxide layer laterally proximate thereof over a substrate; forming a first silicon nitride layer over both the doped oxide layer and the first electrode to a thickness of no greater than 70 Angstroms over at least the first electrode by low pressure chemical vapor deposition using a first set of reactor conditions using feed gases comprising a silicon hydride and ammonia; after using the first set of conditions, forming a second silicon nitride layer on the first silicon nitride layer to a thickness of no greater than 70 Angstroms over at least the first electrode by low pressure chemical vapor deposition using a second set of reactor conditions using feed gases comprising a silicon hydride and ammonia, the second layer being formed to provide a combined thickness of the first and second nitride layers of no greater than 80 Angstroms over the first electrode; exposing the substrate with the first and second silicon nitride layers to oxidizing conditions comprising at least 700Â° C. to form a silicon dioxide layer over the second silicon nitride layer, with the thickness of any silicon nitride layers formed over the doped oxide layer being sufficient to shield oxidizable substrate material beneath the doped oxide layer from oxidizing during the exposing; and forming a second electrode over the silicon dioxide layer and the first electrode.