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US 5,512,768 AGranted
Capacitor for use in DRAM cell using surface oxidized silicon nodules
AssigneeUnited Microelectronics Corp.
InventorsWater Lur, Johnson Liu, Jiunn-Yuan Wu
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Abstract
A MOST capacitor structure in accordance with the invention is formed by using surface oxidized silicon nodules after metal etching to define polysilicon pillars with annular cross sections and with diameters of 0.05 to 0.2 microns.
Claims1
A capacitor for use in a DRAM cell comprising,
- (a) a first polysilicon electrode layer, said first polysilicon electrode layer having a surface with a plurality of annular cylindrical polysilicon pillars,
- (b) a dielectric layer on said surface of said first polysilicon electrode layer, and
- (c) a second polysilicon electrode layer on said dielectric layer, wherein said annular cylindrical pillars have a wall thickness of 100-300 Angstroms and a diameter of 0.05 to 0.2 microns.
Dependencies are inferred from the claim text.