Patent ID: 6074926
Filing Date: 2000-06-13
Classification: H01L,Y10S

Abstract:
A method of forming a capacitor, comprising:providing a substrate having a trench formed therein, the substrate defining a periphery of the trench;providing an electrical node within the substrate and at the periphery of the trench;forming a layer of polysilicon over the substrate and within the trench, the layer of polysilicon being in electrical connection with the electrical node;incontinuously adhering discrete solid particles to the layer of polysilicon, such particles comprising one or both of SiO.sub.2 and Al.sub.2 O.sub.3 ;etching the layer of polysilicon having the adhered discrete solid particles with an etch chemistry that etches the layer of polysilicon but is selective to the adhered discrete solid particles to etch into the polysilicon not covered by the adhered discrete solid particles;forming a capacitor dielectric layer over the etched layer of polysilicon and within the trench; andforming a capacitor plate layer over the capacitor dielectric layer and within the trench.