RRAM Composite Layers for Fast Switching and Low Current
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Resistive random access memory (RRAM) devices have higher programming current and longer programming time compared to spin-transfer torque magnetoresistive RAM (STT-MRAM), which hinders their efficiency and speed in data storage and retrieval.
Innovation Solution
A resistive memory device structure is developed with composite material layers comprising a metal-based high-K dielectric material layer and a metal layer, where the layers are alternately stacked between the upper and lower electrodes, reducing the thickness of each layer to less than 5 nm, and utilizing metals like Hf, Ti, and Al, to facilitate faster switching between conducting and non-conducting states, thereby lowering programming current and time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional RRAM structure is used, then data storage capability is achieved, but programming current is high and programming time is long
Solution Approach 1:
The patent uses composite material layers consisting of metal-based high-K dielectric material layers and metal layers alternately stacked between electrodes. This composite structure enables faster switching between conducting and non-conducting states, reducing programming current to 1E-5A and programming time to 10 ns, thereby resolving the contradiction between programming speed and energy consumption.
Solution Approach 2:
The patent reduces the thickness of each layer in the composite structure to less than 5 nm. This parameter change (reducing thickness) facilitates faster electron transport and switching, which directly reduces both programming time and the current required for programming, addressing the technical contradiction.
2Loss of time
If layer thickness is reduced to less than 5 nm, then programming time is shortened, but manufacturing precision requirements increase
Solution Approach 1:
The patent specifies reducing layer thickness to less than 5 nm to achieve faster switching and shorter programming time (10 ns). This parameter change directly addresses the time loss issue while establishing a clear manufacturing target that balances speed improvement with fabrication feasibility.
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 proposed structure reduces programming current to 1E-5A and shortens programming time to 10 ns, enhancing the efficiency and speed of data storage in RRAM devices compared to conventional methods.
Implementation Method 1
Each memory cell has a large conductive bridge between the upper and lower electrodes. The conductive bridge forms a conductive path, which, depending on the applied voltage, can switch between a conducting state and a non-conducting state.
Implementation Method 2
The first layer is a metal-based high-K dielectric material layer having a first metal element. The high-K dielectric material layer has a dielectric constant that is higher than the dielectric constant of silicon dioxide.
Data Source
AI summary
A resistive memory storage device includes a lower electrode, an upper electrode and a plurality of composite material layers disposed between the lower electrode and the upper electrode. Each composite material layer includes a first layer and a second layer. The first layer is a metal-based high-K dielectric material layer having a first metal element, and the second layer is a metal layer having the first metal element.