Bottom Electrode Reactivity Reduction in RRAM Devices
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Solution Overview
Problem
Resistive random-access memory (RRAM) devices face challenges in achieving reliable data retention and cycling due to the reactivity of the bottom electrode with oxygen in the data storage layer, which affects their performance and endurance.
Innovation Solution
Incorporating a reactivity reducing layer with a higher electronegativity than the bottom electrode material to reduce its reactivity with oxygen, thereby improving the reliability of the RRAM device by enhancing data retention and increasing the number of read/write cycles without errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a bottom electrode is used in RRAM devices, then electrical conduction is enabled, but reactivity with oxygen reduces reliability and data retention
Solution Approach 1:
A reactivity reducing layer is introduced as an intermediary between the bottom electrode and the oxygen-containing environment. This layer has higher electronegativity than the bottom electrode material, which attracts oxygen away from the bottom electrode interface, thereby reducing the harmful reactivity between oxygen and the bottom electrode while maintaining electrical functionality.
2Reliability
If the bottom electrode material is highly conductive, then electrical performance is improved, but reactivity with oxygen increases reducing endurance
Solution Approach 1:
The reactivity reducing layer serves as a protective intermediary that allows highly conductive bottom electrode materials to be used without suffering from oxygen reactivity. The layer has higher electronegativity and acts as an oxygen sink, preventing oxygen from reacting with the conductive bottom electrode, thus maintaining both high conductivity and improved endurance.
Solution Approach 2:
The invention changes the electronegativity parameter of the interface layer between the bottom electrode and oxygen environment. By selecting materials with higher electronegativity for the reactivity reducing layer, the chemical reactivity parameters at the interface are modified to reduce oxygen uptake and improve device endurance.
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 reactivity reducing layer effectively decreases the bottom electrode's reactivity with oxygen, leading to improved data retention and increased endurance of RRAM devices, maintaining a sufficient read window for a larger number of read/write operations.
Implementation Method 1
Incorporating a reactivity reducing layer with a higher electronegativity than the bottom electrode material to reduce its reactivity with oxygen
Data Source
AI summary
In some embodiments, the present disclosure relates to a method of forming an integrated chip. The method includes forming a reactivity reducing coating over one or more lower interconnect layers disposed over a substrate. A bottom electrode layer is formed on and in contact with the reactivity reducing coating. The bottom electrode layer has a first electronegativity that is less than or equal to a second electronegativity of the reactivity reducing coating. A data storage element is formed over the bottom electrode layer and a top electrode layer is formed over the data storage element. The top electrode layer, the data storage element, the reactivity reducing coating, and the bottom electrode layer are patterned to define a memory device.