Method of fabricating capacitor over bit line COB structure for

Details Method of fabricating capacitor over bit line COB structure for Method of fabricating capacitor over bit line COB structure for

1997-10-24

1998-06-09

Chang, Joni

Semiconductor device manufacturing: process

Making field effect device having pair of active regions...

Having insulated gate

438398, H01L 218242, H01L 2120

Patent

active

057633061

ABSTRACT:
A method of creating a deep pocket, capacitor over bit line structure, used for high density, DRAM designs, has been developed. The process consists of creating silicon nitride covered, polysilicon bit line structures, on an insulator layer, contacting an underlying source and drain region. A series of layers are next deposited, and patterned, to form the initial phase of a storage node contact hole, terminating at the surface of the silicon nitride covered polysilicon bit line structures. After formation of insulator spacers, protecting the silicon nitride covered, polysilicon bit line structures, the final phase of the storage node contact hole is formed, between polysilicon bit line structures, using RIE procedures. A storage node structure, featuring an HSG silicon layer, is formed on the inside surface of the storage node contact hole, followed by the creation of a capacitor dielectric layer, and an upper electrode structure, resulting in a deep pocket, capacitor over bit line structure.

REFERENCES:
patent: 5338700 (1994-08-01), Dennison et al.
patent: 5401681 (1995-03-01), Dennison
patent: 5447882 (1995-09-01), Kim
patent: 5478768 (1995-12-01), Iwasa

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