Polymer Memory Adhesion Layer Immobilized Metal Catalyst

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Solution Overview

Problem

Ferroelectric memory devices face challenges such as material degradation due to reactions with and migration of adjacent metal electrode materials, high temperature or high energy processing damage, and parasitic capacitance from additional dielectric layers, which affect the performance and longevity of polymer ferroelectric memory devices.

Innovation Solution

The implementation of a layered structure with immobilized palladium catalysts and electrolessly plated metal barriers to improve adhesion and prevent reactions between metal electrodes and the ferroelectric polymer, reducing exposure to high-energy processes and eliminating the need for additional dielectric layers, thereby mitigating degradation and parasitic capacitance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If metal electrode materials are used adjacent to ferroelectric polymer, then electrical conductivity and electrode functionality are improved, but material degradation occurs due to reactions with and migration into the polymer

Engineering Contradiction:

Improvedevice longevityVSAvoidmaterial degradation

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

A barrier layer comprising a metal nitride or metal oxynitride is introduced between the metal electrode material and the ferroelectric polymer. This intermediary layer prevents direct contact and chemical reactions between the electrode metal and polymer, while also blocking metal migration into the polymer, thereby eliminating material degradation without compromising electrode functionality.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Object-affected harmful factors

If additional dielectric layers are added to prevent metal-polymer reactions, then material protection is improved, but parasitic capacitance increases

Engineering Contradiction:

Improvematerial protectionVSAvoidparasitic capacitance

Core Design Contradiction:

Object-affected harmful factorsVSDevice complexity

Solution Approach 1:

The barrier layer is formed with specific material composition (metal nitride or metal oxynitride) and controlled thickness to provide adequate protection against metal-polymer reactions while maintaining low dielectric constant properties. This parameter optimization ensures sufficient material protection without introducing excessive parasitic capacitance that would arise from thicker or higher-k dielectric materials.

Inventive Principle:

Principle #35Parameter changes

3Ease of manufacture

If high temperature or high energy processing is used during fabrication, then manufacturing capability is improved, but polymer ferroelectric material degradation occurs

Engineering Contradiction:

Improvefabrication capabilityVSAvoidpolymer integrity

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The barrier layer is formed prior to subsequent high temperature or high energy processing steps. This preliminary protective action shields the polymer ferroelectric material from thermal and energetic damage during fabrication, enabling the use of aggressive processing conditions to improve manufacturing capability without compromising polymer integrity.

Inventive Principle:

Principle #10Preliminary action

4Reliability

If barrier layers are added to prevent metal migration, then adhesion and protection are improved, but device complexity increases

Engineering Contradiction:

Improveadhesion and protectionVSAvoidlayer structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The barrier layer utilizes composite material properties of metal nitride or metal oxynitride, which provide both protective functions (preventing metal migration and reactions) and electrical insulation properties in a single layer. This composite approach achieves superior protection while minimizing the number of discrete layers required, thereby reducing overall device complexity.

Inventive Principle:

Principle #40Composite materials

Applied Scientific Principles

This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.

Function Achieved in This Case

This approach extends the useful life of ferroelectric memory devices by reducing material degradation, improving adhesion, and minimizing exposure to damaging processes, resulting in enhanced reliability and performance of polymer ferroelectric memory devices.

Implementation Method 1

incorporating an immobilized catalyst to improve the adhesion between electrolessly plated electrodes and adjacent layers, and in particular, between the electrolessly plated electrodes and the ferroelectric polymer

Methodology Applied

Scientific EffectCatalysis: Catalysis

Implementation Method 2

The plated metal barrier decreases or prevents a reaction between the plated metal electrode and the ferroelectric polymer and decreases or prevents migration of the plated metal electrode material into the ferroelectric polymer

Methodology Applied

Scientific EffectDiffusion Barrier: Diffusion Barrier

Data Source

PatentUS7709873B2Polymer memory with adhesion layer containing an immobilized metal

Publication Date: 2010.05.04 INTEL CORP

AI summary

An embodiment mitigates one or more of the limiting factors of fabricating polymer ferroelectric memory devices. For example, an embodiment reduces the degradation of the ferroelectric polymer due to the polymer's reaction with, and migration or diffusion of, adjacent metal electrode material. Further, the ferroelectric polymer is exposed to fewer potentially high temperature or high energy processes that may damage the polymer. An embodiment further incorporates an immobilized catalyst to improve the adhesion between adjacent layers, and particularly between the electrolessly plated electrodes and the ferroelectric polymer.