Phase Change Memory Via Resistance Reduction

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Solution Overview

Problem

Phase change memory devices face challenges in achieving high-density memory structures with optimal operational efficiency and material stability, particularly due to increased electrical resistance and energy consumption caused by metal ceramic composite material layers between bitlines and vias.

Innovation Solution

The implementation of memory structures with a metal ceramic composite material layer between the memory cell and conductive layers, along with a dielectric material and a conductive layer in direct contact with the via, minimizes programming current and enhances thermal efficiency by optimizing the placement and thickness of these layers.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Stability of the object's composition

If metal ceramic composite material layers are placed between bitlines and vias, then material stability is improved, but electrical resistance increases

Engineering Contradiction:

Improvematerial stabilityVSAvoidelectrical resistance

Core Design Contradiction:

Stability of the object's compositionVSReliability

Solution Approach 1:

The patent removes the metal ceramic composite material layer from between the bitline and via, extracting the problematic component that caused high electrical resistance. The via is placed in direct contact with the bitline, eliminating the intermediate layer that compromised electrical conductivity while preserving material stability through alternative structural arrangements.

Inventive Principle:

Principle #2Taking out (Extraction)

Solution Approach 2:

The patent introduces a dielectric material as an intermediary element that enables direct contact between the via and bitline while maintaining proper material stability. This mediator allows the via to penetrate through the metal ceramic composite material layer and establish direct electrical contact with the bitline, resolving the contradiction between stability and resistance.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Stability of the object's composition

If metal ceramic composite material layers are used, then material stability is improved, but energy consumption increases

Engineering Contradiction:

Improvematerial stabilityVSAvoidenergy consumption

Core Design Contradiction:

Stability of the object's compositionVSUse of energy by moving object

Solution Approach 1:

The patent extracts the metal ceramic composite material layer from the electrical current path by placing the via in direct contact with the bitline. This removal eliminates the energy loss associated with current passage through the high-resistance intermediate layer, reducing programming energy consumption while maintaining material stability through the via's direct connection architecture.

Inventive Principle:

Principle #2Taking out (Extraction)

3Productivity

If via resistance is reduced, then programming efficiency is improved, but structural complexity increases

Engineering Contradiction:

Improveprogramming efficiencyVSAvoidstructural complexity

Core Design Contradiction:

ProductivityVSDevice complexity

Solution Approach 1:

The patent segments the metal ceramic composite material layer to allow the via to penetrate through it and make direct contact with the bitline. This segmentation approach reduces via resistance and improves programming efficiency by creating a direct electrical pathway, while the segmented structure actually simplifies the overall device architecture by eliminating the need for complex alternative routing.

Inventive Principle:

Principle #1Segmentation

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 configuration reduces electrical resistivity and energy consumption, enabling better thermal efficiency and material stability in phase change memory devices, thereby improving programming efficiency and memory cell performance.

Implementation Method 1

a conductive layer on the metal ceramic composite material layer and the via, where the conductive layer is in direct contact with an upper surface of the via

Methodology Applied

Scientific EffectElectrical Conduction: Conduction (electrical)

Implementation Method 2

Different physical states of the phase change material have different levels of electrical resistance. For example, one state, such as an amorphous state, can have a high electrical resistance, while another state, such as a crystalline state, can have a low electrical resistance.

Methodology Applied

Scientific EffectPhase Change: Phase Change

Implementation Method 3

a metal ceramic composite material layer on the memory cell and the dielectric material

Methodology Applied

Scientific EffectThermal Conduction: Conduction (thermal)

Data Source

PatentUS10600844B2Memory structures having reduced via resistance

Publication Date: 2020.03.24 INTEL CORP

AI summary

A memory structure can include a memory cell, a via, a dielectric material separating the memory cell from the via, a metal ceramic composite material layer on the memory cell and the dielectric material, and a conductive layer on the metal ceramic composite material layer and the via. The conductive layer can be in direct contact with the top surface of the via.