Patent ID: 6146967
Filing Date: 2000-11-14
Classification: C23C,H01L,Y10S

Abstract:
A method for forming a capacitor in an insulative layer supported by a substrate, the method comprising the steps of:removing a first portion of the insulator layer to form an opening;forming a first layer of undoped amorphous silicon on the insulative layer;forming a layer of doped amorphous silicon on the first layer of silicon;forming a second layer of undoped amorphous silicon on the doped layer of silicon;forming containers in the insulative layer (by planarization) comprising pillars of doped silicon painted with the layers of undoped amorphous silicon;removing selected portions of the insulative layer to expose at least a portion of exterior sidewalls of the containers; andseeding the first and second amorphous silicon layers in a seeding environment consisting of a carrier with a dilute hydride gas and a chemical species at a low temperature and pressure to form a seeded silicon coating;preventing the silicon coating from building up on the insulative layer by adding chlorine to the gases used in the preceding seeding step after stabilization of the hydride flow; andannealing the seeded amorphous silicon layers at a higher temperature to convert the first and second layers to HSG while continuing the flow of the carrier gas.