Patent ID: 6218244
Filing Date: 2001-04-17
Classification: H01L

Abstract:
A method of manufacturing a capacitor of a dynamic random access memory, comprising the steps of:providing a silicon substrate structure, wherein the silicon substrate structure includes an oxide layer over a substrate, a polysilicon layer over the oxide layer, and a plug under the polysilicon layer that penetrates through the oxide layer;forming a patterned photoresist layer over the polysilicon layer, wherein the patterned photoresist layer includes a first set of openings;conducting a chemical reaction next to the sidewalls of the photoresist layer so that spacers are formed;removing the polysilicon layer under the first set of openings by dry etching;removing the photoresist layer between the spacers in the dry etching operation so that a second set of openings between the spacers is formed;removing a portion of the polysilicon layer under the second set of openings by continuing the dry etching operation while using the spacers as a mask so that a polysilicon layer having a desired thickness remains under the second set of openings; andremoving the spacers to form a crown-shaped capacitor.