Semiconductor device manufacturing: process – Making passive device – Stacked capacitor
Patent
1997-06-18
1998-04-07
Nguyen, Tuan H.
Semiconductor device manufacturing: process
Making passive device
Stacked capacitor
438397, 438253, 438254, 438738, 148DIG14, H01L 2120
Patent
active
057364508
ABSTRACT:
An improved process for fabricating cylindrical capacitors for use in DRAMs is described wherein the silicon nitride etch stop layer is eliminated. The etch stop layer is normally used to halt etching during the formation of the dielectric cylinder that is used as a substrate on which the cylindrical electrode gets built. If etching is allowed to proceed, the underlying dielectric layer on which the cylinder rests will also be removed. In place of the etch stop layer, the present invention calls for two dielectric layers that have generally similar properties in other respects but substantially different etch rates. For the fast etching dielectric, O.sub.3 TEOS is used while, for the slow etching dielectric, BPTEOS is used. When etched in 10:1 BOE a differential etch rate of about 10 times is obtained so that formation of a O.sub.3 TEOS cylindrical substrate can be completed without significantly eroding the underlying BPTEOS support layer.
REFERENCES:
patent: 5273925 (1993-12-01), Yamanaka
patent: 5387533 (1995-02-01), Kim
patent: 5403767 (1995-04-01), Kim
patent: 5436187 (1995-07-01), Tanigawa
patent: 5506164 (1996-04-01), Kinoshita et al.
patent: 5543346 (1996-08-01), Keum et al.
patent: 5550076 (1996-08-01), Chen
patent: 5663092 (1997-09-01), Lee
patent: 5668038 (1997-09-01), Huang et al.
Huang Julie
Wang Eric
Ackerman Stephen B.
Nguyen Tuan H.
Saile George O.
Taiwan Semiconductor Manufacturing Company , Ltd.
LandOfFree
Method for forming a cylindrical capacitor does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method for forming a cylindrical capacitor, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method for forming a cylindrical capacitor will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-12832