PRAM Heat Efficiency Element for Reset Current Reduction
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Solution Overview
Problem
Conventional phase change random access memory (PRAM) devices face challenges in increasing integration density due to high reset currents, which are difficult to reduce without compromising data storage capabilities.
Innovation Solution
Incorporating a heat efficiency improving element, such as a carbon nanotube or fullerene layer, between the electrodes and phase change layer to decrease the reset current by enhancing heat efficiency and maintaining the phase change layer in an amorphous state at lower currents.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the size of the transistor is reduced to increase integration density, then the integration density is improved, but the maximum current allowed in the transistor is reduced making it impossible to achieve data storage using phase change characteristic
Solution Approach 1:
A heat efficiency improving element is introduced as an intermediary component between the transistor and the phase change layer. This mediator enhances heat transfer efficiency from the transistor to the phase change layer, enabling effective phase change operation even with reduced transistor current capacity, thus resolving the contradiction between integration density and data storage capability
Solution Approach 2:
The patent changes the thermal parameters of the system by introducing a heat efficiency improving element with specific thermal conductivity properties. This parameter change allows the phase change layer to reach required temperatures for data storage using lower currents, enabling smaller transistor sizes while maintaining functionality
2Length of moving object
If the reset current is reduced to enable smaller transistor sizes, then the transistor size can be reduced, but the phase change layer cannot be maintained in an amorphous state effectively
Solution Approach 1:
The heat efficiency improving element acts as a thermal mediator that concentrates and directs heat efficiently to the phase change layer. This allows the system to maintain the phase change layer in an amorphous state using reduced reset currents, enabling smaller transistor sizes without compromising phase change state maintenance
Solution Approach 2:
The heat efficiency improving element creates localized high thermal conductivity regions at the interface with the phase change layer. This local quality enhancement ensures that sufficient heat is delivered to the phase change layer even when the overall reset current is reduced, maintaining reliable phase change operation with smaller transistors
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 use of heat efficiency improving elements reduces the reset current, allowing for smaller transistor sizes and increased integration density in PRAM devices while maintaining data storage capabilities.
Implementation Method 1
A PRAM is a nonvolatile memory device capable of recording and reading data using the resistance characteristic
Implementation Method 2
a heat efficiency improving element formed between the first electrode and the phase change layer
Implementation Method 3
A phase change layer of a phase change random access memory (PRAM), in which data is recorded, has a crystal structure or an amorphous structure depending on a heating temperature and a cooling speed
Data Source
AI summary
A phase change random access memory (PRAM), and a method of operating the PRAM are provided. In the PRAM comprising a switching element and a storage node connected to the switching element, the storage node comprises a first electrode, a second electrode, a phase change layer between the first electrode and a second electrode, and a heat efficiency improving element formed between the first electrode and the phase change layer. The heat efficiency improving element may be one of a carbon nanotube (CNT) layer, a nanoparticle layer, and a nanodot layer, and the nanoparticle layer may be a fullerene layer.