Double Self-Aligned Phase Change Memory Structure
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Solution Overview
Problem
Current phase change memory devices face challenges in achieving efficient heat confinement and small feature size dimensions, particularly in structures with characteristic dimensions below 10 nm, which affects their heating efficiency and resistivity-based data storage capabilities.
Innovation Solution
The development of a double self-aligned phase change memory device structure featuring spaced-apart phase change memory film members, each with a conductive element contact, and a protective dielectric layer, allowing for precise control of film thickness and contact areas, enabling efficient heat management and data storage in confined cell structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the characteristic dimensions of phase change memory structures are reduced to below 10 nm, then the storage density is improved, but the heating efficiency deteriorates
Solution Approach 1:
The patent transitions from planar 2D phase change memory structures to three-dimensional vertical structures with multiple stacked memory layers. Each layer includes phase change material films separated by dielectric layers, with conductive elements extending through multiple layers. This dimensional change allows increased storage density while maintaining adequate heating efficiency through the vertical stacking architecture.
Solution Approach 2:
The patent divides the phase change memory structure into multiple discrete layers stacked vertically. Each memory layer contains phase change material films separated by dielectric layers, and conductive elements are segmented to contact specific layers. This segmentation enables independent addressing of memory layers and maintains heating efficiency in each layer while achieving high overall density.
2Volume of moving object
If the phase change memory material thickness is reduced to increase storage density, then the storage capacity is improved, but the data retention and phase change reliability worsen
Solution Approach 1:
The patent employs composite material structures where phase change material films are combined with dielectric materials and conductive elements in a stacked configuration. The dielectric layers provide thermal isolation while the conductive elements ensure proper heating. This composite approach maintains adequate film thickness for reliability while achieving high storage density through vertical stacking.
Solution Approach 2:
The patent utilizes thin film structures for the phase change material layers, with each layer being sufficiently thin to increase density but maintained at a thickness that ensures reliable phase change. The thin films are supported by dielectric and conductive layers that provide mechanical support and functional properties, enabling the use of thin films without sacrificing reliability.
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 enables effective heat confinement and improved resistivity-based data storage in small feature sizes, enhancing the performance of phase change memory devices by optimizing film thickness, contact areas, and structural arrangements, thereby improving heating efficiency and storage capabilities.
Implementation Method 1
Phase change memory (PCM) is a type of non-volatile computer memory that utilizes differences in the electrical resistivity of the crystalline and amorphous phase states of memory materials
Implementation Method 2
The conduction of current is effected through the deposited memory material, with the level of current being dependent on the resistivity and heating efficiency of such memory material and its alloy properties on phase change
Data Source
AI summary
A double self-aligned phase change memory device structure, comprising spaced-apart facing phase change memory film members symmetrically arranged with respect to one another, each of the phase change memory film members at an upper portion thereof being in contact with a separate conductive element, and each of the phase change memory film members being in a range of from 5 nm to 25 nm in thickness. Also described are various methods of making such phase change memory device structure.