RRAM Solid Solution Layer for Voltage Stability
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Solution Overview
Problem
Conventional resistive random access memory (RRAM) exhibits unstable voltage and resistance variations due to an unstable resistance level of the resistive layer, leading to decreased reliability.
Innovation Solution
A transition metal solid solution layer is formed between the electrode and the resistive layer, stabilizing voltage and resistance variations by using a solid solution layer composed of transition metals like Ni, Hf, Zr, Zn, W, Co, Au, Pt, Ru, Ir, and Ti, which is formed through methods such as sputtering and atomic layer deposition, with controlled gas pressure to enhance the stability of set and reset voltages and resistances.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional resistive layer is used in RRAM, then the device structure is simple, but the voltage and resistance variations are unstable leading to decreased reliability
Solution Approach 1:
A solid solution layer composed of transition metals (Ni, Hf, Zr, Zn, W, Co, Au, Pt, Ru, Ir, or Ti) is introduced as an intermediary layer between the electrode and the resistive layer. This intermediate layer stabilizes the interface and reduces voltage and resistance variations, thereby improving reliability without fundamentally changing the overall device architecture.
Solution Approach 2:
The solid solution layer is formed by creating a composite structure where transition metal atoms are dissolved in a host metal matrix. This composite material approach allows tuning of electrical properties and stabilization of the electrode-resistive layer interface, addressing the reliability issue while maintaining structural simplicity.
2Reliability
If additional solid solution layer is added to stabilize voltage and resistance, then reliability improves, but manufacturing process complexity increases
Solution Approach 1:
The solid solution layer formation is merged with the existing sputtering process used for depositing the resistive layer. By adjusting process parameters such as gas pressure and target composition during the sputtering step, the solid solution layer is formed simultaneously with the resistive layer, avoiding the need for a separate fabrication step and minimizing manufacturing complexity.
3Reliability
If solid solution layer is formed through controlled sputtering, then voltage stability improves, but manufacturing time increases
Solution Approach 1:
The composition and structure of the solid solution layer are optimized in advance through process parameter selection (gas pressure, target material, sputtering power). This preliminary optimization allows the layer to form with desired stabilizing properties in a single sputtering step, preventing the need for multiple iterative adjustments or additional processing steps that would extend manufacturing time.
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 implementation of a transition metal solid solution layer results in a more reliable RRAM with stable set and reset voltages and resistances, improving data retention and operational speed while reducing manufacturing time and costs.
Implementation Method 1
formed through methods such as sputtering and atomic layer deposition
Implementation Method 2
formed through methods such as sputtering and atomic layer deposition
Data Source
AI summary
A resistive random access memory (RRAM) having a solid solution layer and a method of manufacturing the RRAM are provided. The RRAM includes a lower electrode, a solid solution layer on the lower electrode, a resistive layer on the solid solution layer, and an upper electrode on the resistive layer. The method of manufacturing the RRAM includes forming a lower electrode, forming a solid solution layer on the lower electrode, forming a resistive layer on the solid layer and forming an upper electrode on the resistive layer, wherein the RRAM is formed of a transition metal solid solution.