Ferroelectric based capacitor for use in memory systems and meth

Details Ferroelectric based capacitor for use in memory systems and meth Ferroelectric based capacitor for use in memory systems and meth

1995-03-17

1996-07-30

Picard, Leo P.

Electricity: electrical systems and devices

Electrostatic capacitors

Fixed capacitor

3613213, 3613214, 361311, 361312, 361313, 365145, 257295, 257296, 4271263, 501134, H01G 406

Patent

active

055418074

ABSTRACT:
A ferroelectric based capacitor structure and method for making the same. The capacitor includes a bottom electrode having a layer of Pt in contact with a first layer of an ohmic material. The capacitor dielectric is constructed from a layer of lead zirconium titanate doped with an element having an oxidation state greater than +4. The top electrode of the capacitor is constructed from a second layer of ohmic material in contact with a layer of Pt. The preferred ohmic material is LSCO; although RuO.sub.2 may also be utilized. The capacitor is preferably constructed over the drain of an FET such that the bottom electrode of the capacitor is connected to the drain of the FET. The resulting capacitor structure has both low imprint and low fatigue.

REFERENCES:
patent: 5216572 (1993-06-01), Larson et al.
patent: 5342648 (1994-08-01), Mackenzie et al.

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