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EP0503078A1 Expired / Lapsed EP ⏱️ 0.0 years remaining

Semiconductor device

Assignee: Ramtron International Corp
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Filing: 1991-09-26
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Granted: —
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Expires: 2011-09-26
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Abstract

Abstract There are a transistor (TR) comprising a gate electrode (23), a source region (24) and a drain region (25), and the structural body of a ferroelectric capacitor (C) on a local oxide film (26). This structural body has a ferroelectric film (29) sandwiched between an upper electrode (32) and a lower electrode (28). The upper electrode (32) and the source region (24) are connected by a wiring in which a conductive film (35) for preventing reactions and a wiring electrode (34) comprising Al are deposited. The conductive film (35) for preventing reactions is of TiN, MoSi, W or the like. Even when, after forming the wiring electrode, for the purpose of improving characteristics, an annealing treatment is performed or a final protective film is formed, the wiring electrode (34) does not react with the upper electrode (32), and a good ferroelectric film characteristic is obtained, and further, a ferroelectric memory of high performance and highly dense integration can be formed.

Inventors

  • 👤 Kazuhiro Takenaka

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 16:18
CPC Classifications
H; H10; H10B; H10B69/00; H10B53/00

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 41 words
A semiconductor device comprising a capacitor formed of a ferroelectric film or a high dielectric constant film as an elemental component, which is characterized in that at least one of electrodes of the capacitor has a connection through a ferroelectric film.
Claim 2
Dependent Claim 85 words
A semiconductor device comprising, as elemental components, an active element formed on the principal surface or in the inside of a semiconductor body, a capacitor formed of a ferroelectric film or a high dielectric constant film formed through an electrode, an isolation oxide film for the active element and a wiring electrode for the connection of the capacitor, which is characterized in that at least a conductive, reaction-preventing film is formed at the wiring electrode, and that the electrode contacts with the conductive, reaction-preventing film.
Claim 3
Dependent Claim 101 words
A semiconductor device comprising, as elemental components, an active element formed on the principal surface or in the inside of a semiconductor body, a capacitor formed of a ferroelectric film or a high dielectric constant film formed through an electrode, an isolation oxide film for the active element and a wiring electrode for the connection of the capacitor, which is characterized in that the electrode connected to the wiring electrode is formed as a stacked structure which comprises a conductive, reaction-preventing film contacting with the wiring electrode and an electrode contacting with the ferroelectric film or the high dielectric constant film.
Claim 4
Dependent Claim 92 words
A semiconductor device comprising, as elemental components, an active element formed on the principal surface or in the inside of a semiconductor body, a capacitor formed of a ferroelectric film or a high dielectric constant film formed through an electrode, an isolation oxide film for the active element and a wiring electrode for the connection of the capacitor, which is characterized in that the electrode of the capacitor is connected to a diffusion layer formed at the principal surface or in the inside of the semiconductor body through a conductive, reaction-preventing film.
Claim 5
Dependent Claim 46 words
A semiconductor device as claimed in claim 2 or 4, which is characterized in that a metal silicide is formed at an interface where the ferroelectric, reaction-preventing film contacts with a diffusion layer formed at the principal surface or in the inside of the semiconductor body.
Claim 6
Dependent Claim 99 words
A semiconductor device as claimed in any one of claims 1 to 5, which is characterized in that the conductive, reaction-preventing film is any one of films selected from a group of a high melting point metal film of Mo, W, Ti, Ta, Ru or Re, a high melting point metal silicide film of Mo, W, Ti, Ta, Ru or Re, a high melting point metal oxide film of Mo, W, Ti, Ta, Ru or Re, a high melting point metal nitride oxide film of Mo, W, Ti, Ta, Ru or Re and at least one compound film thereof.
Claim 7
Dependent Claim 49 words
A semiconductor device as claimed in claim 5, which is characterized in that the metal silicide film is any one of films selected from a group of a high melting point metal silicide film of Mo, W, Ti, Ta, Ru or Re and at least one compound film thereof.
Claim 8
Dependent Claim 33 words
A semiconductor device as claimed in any one of claims 1 to 7, which is characterized in that the ferroelectric film or the high dielectric constant film is PZT, PLZT, SrTiO₃ or Ta₂O₅.

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