Thin film capacitor with small leakage current and method for fa

Details Thin film capacitor with small leakage current and method for fa Thin film capacitor with small leakage current and method for fa

1995-08-02

1997-09-23

Bowers, Jr., Charles L.

Fishing, trapping, and vermin destroying

437 47, 437 52, 437919, 148DIG14, H01L 218242

Patent

active

056704089

ABSTRACT:
A thin film capacitor uses a dielectric film of high dielectric constant. A lower electrode is disposed on a contact, an interlayer insulating film is in contact with the lower electrode, a dielectric film of high dielectric constant covers the lower electrode, and an upper electrode covers the dielectric film. Thicknesses of the dielectric film at lower end portions of the lower electrode are thin but thick enough to make a leakage current value lower than a tolerable value thereof. At locations immediately below the lower electrode, the interlayer insulating film has portions whose thicknesses are larger than thicknesses of other portions thereof. The interlayer insulating film is such that, immediately below the regions of the dielectric film which are located at lower end portions of sides of the lower electrode and at which thicknesses of the dielectric film are very thin, the thicknesses of the interlayer insulating film are made larger than the rest thereof, or the dielectric film is such that lower end portions thereof are thin but thick enough to make a leakage current value lower than a tolerable value thereof. In this way, the occurrence of leakage current at the lower end portions of the lower electrode is suppressed.

REFERENCES:
patent: 5293510 (1994-03-01), Takenaka
patent: 5568352 (1996-10-01), Hwang
patent: 5576928 (1996-11-01), Summerfelt et al.
patent: 5585300 (1996-12-01), Summerfelt
T. Ema et al., "3-Dimensional Stacked Capacitor Cell for 16M and 64M DRAMs", International Electron Devices Meeting Digest of Technical Paper, 1988, pp. 592-594.

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