Memristor Oxygen-Depleted Region Formation via Sink Layer
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods face difficulties in uniformly forming oxygen-depleted regions in metal oxide materials for memristor and RRAM cells, which affects the consistency and efficiency of memory cell formation across a memory array.
Innovation Solution
The use of an oxygen-sink material layered over a metal oxide material, where oxygen is transferred to form an oxygen-depleted region, subdividing the metal oxide into regions with varying oxygen concentrations, thereby creating a memory cell structure that can be thermally or electrically treated to achieve a self-limiting thickness for the depletion region.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If oxygen-depleted regions are formed by direct deposition methods, then memory cell formation can be achieved, but uniformity and consistency across the memory array deteriorate
Solution Approach 1:
An oxygen-sink material layer is introduced as an intermediary between the metal oxide material and the upper electrode. This oxygen-sink material acts as a mediator that selectively absorbs oxygen during thermal or electrical treatment, enabling controlled formation of oxygen-depleted regions in the metal oxide material below. The intermediary layer facilitates uniform oxygen depletion across the entire memory array area, resolving the contradiction between manufacturing precision and productivity.
Solution Approach 2:
The oxygen-sink material layer is deposited beforehand onto the metal oxide material before final memory cell formation. This preliminary action prepares the structure for subsequent uniform oxygen depletion by positioning the oxygen-absorbing material in advance, allowing consistent formation of oxygen-depleted regions across the entire array during a single thermal or electrical treatment step.
2Manufacturing precision
If oxygen-sink material is used to transfer oxygen and form depleted regions, then uniformity of memory cell formation is improved, but device structure complexity increases
Solution Approach 1:
The oxygen-sink material layer undergoes parameter changes during thermal or electrical treatment, transitioning from a metallic state to an oxidized state as it absorbs oxygen from the metal oxide material. This parameter change (oxidation state transformation) enables the formation of uniform oxygen-depleted regions without requiring complex structural modifications to the overall memory cell design.
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
This approach allows for the consistent formation of memory cells with tailored oxygen-depleted regions, enhancing the uniformity and efficiency of memory cell production across multiple cells, overcoming previous challenges in directly depositing oxygen-depleted regions.
Implementation Method 1
oxygen is transferred to form an oxygen-depleted region, subdividing the metal oxide into regions with varying oxygen concentrations
Implementation Method 2
The first metal oxide material has at least two regions which differ in oxygen concentration relative to one another
Data Source
AI summary
Some embodiments include memory cells which contain, in order; a first electrode material, a first metal oxide material, a second metal oxide material, and a second electrode material. The first metal oxide material has at least two regions which differ in oxygen concentration relative to one another. One of the regions is a first region and another is a second region. The first region is closer to the first electrode material than the second region, and has a greater oxygen concentration than the second region. The second metal oxide material includes a different metal than the first metal oxide material. Some embodiments include methods of forming memory cells in which oxygen is substantially irreversibly transferred from a region of a metal oxide material to an oxygen-sink material. The oxygen transfer creates a difference in oxygen concentration within one region of the metal oxide material relative to another.