Patent ID: 6239040
Filing Date: 2001-05-29
Classification: H01L

Abstract:
A method of coating an amorphous silicon film formed on polysilicon blocks, comprising:providing a substrate;forming an insulating layer over the substrate;forming a plurality of polysilicon blocks through the insulating layer to make contact with the substrate;forming a silicon nitride layer over the insulating layer to conformally cover the polysilicon blocks;forming a silicon dioxide layer on the silicon nitride layer to fill vacant spaces between the polysilicon blocks;polishing the silicon dioxide layer until the silicon nitride layer is exposed to remove the silicon dioxide layer above the silicon nitride layer;removing a portion of the silicon nitride layer with the silicon dioxide layer as a mask to expose the polysilicon blocks;forming an amorphous silicon layer over the silicon dioxide layer and the polysilicon blocks;polishing the amorphous silicon layer until the silicon dioxide layer is exposed to leave a remaining amorphous silicon layer covering the polysilicon blocks; andremoving the silicon dioxide layer and a underlying silicon nitride layer.