Boron Nitride Liner for Phase Change Memory Thermal Management
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Solution Overview
Problem
The fabrication of PCM-based memory architectures faces challenges due to the phase change material's vulnerability to oxidation and poor heat dissipation, particularly when using traditional low-temperature dielectric layers with high hydrogen content.
Innovation Solution
A liner layer composed of boron nitride is introduced to protect the phase change material, allowing for low-temperature deposition with low hydrogen content and high thermal conductivity, enhancing barrier protection and heat dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If traditional low-temperature dielectric layers are used to protect the phase change material, then the deposition temperature is reduced, but the hydrogen content increases and thermal conductivity decreases
Solution Approach 1:
The patent uses a composite liner structure consisting of multiple layers including silicon nitride, boron nitride, and silicon oxide deposited in sequence. This composite structure combines the low-temperature deposition capability of silicon nitride with the high thermal conductivity and low hydrogen content of boron nitride, resolving the contradiction between low deposition temperature and high barrier protection/heat dissipation performance
Solution Approach 2:
The boron nitride layer acts as an intermediary between the phase change material and the silicon nitride layer. It provides a transition that maintains low deposition temperature while introducing high thermal conductivity and low hydrogen content properties, thereby mediating the contradiction between temperature and reliability
2Ease of manufacture
If traditional dielectric layers are used, then the process is simple, but oxidation protection is insufficient and heat dissipation is poor
Solution Approach 1:
The multi-layer composite liner structure combines materials with complementary properties: silicon nitride for ease of deposition, boron nitride for high thermal conductivity and oxidation resistance, and silicon oxide for additional barrier protection. This composite approach maintains manufacturing simplicity while dramatically improving oxidation protection and heat dissipation
Solution Approach 2:
The boron nitride layer performs multiple functions simultaneously: it provides oxidation protection, enhances thermal conductivity for heat dissipation, and maintains low hydrogen content. This multi-functionality addresses multiple harmful factors without significantly complicating the fabrication process
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
The boron nitride liner layer effectively protects the phase change material from oxidation and improves heat dissipation, addressing the limitations of traditional dielectric layers in PCM-based memory cells.
Implementation Method 1
The boron nitride liner layer effectively protects the phase change material from oxidation
Implementation Method 2
exhibits a high thermal conductivity resulting in improved operation of the memory cell
Data Source
AI summary
A new liner structure for improving memory cell design is disclosed that incorporates a boron nitride dielectric layer. An example memory device includes an array of memory cells with each of at least some of the memory cells having a stack of layers, the stack comprising at least one phase change layer. A dielectric layer is provisioned over one or more sidewalls of at least the phase change layer. The dielectric layer comprises both nitrogen and boron. The dielectric layer may be part of a liner structure that includes multiple layers, such as an alternating layer stack of boron nitride and silicon nitride. The dielectric layer can be deposited at low temperature (e.g., less than about 300° C.) while maintaining a low hydrogen content and a relatively high thermal conductivity.