RRAM Top Electrode Protrusion for Field Enhancement
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Solution Overview
Problem
The formation of RRAM cells with decreasing sizes results in random distributions of electrical operating parameters due to non-uniformity and quality issues in the dielectric data storage layer, leading to reliability and performance problems.
Innovation Solution
The introduction of a top electrode with a protrusion having a sharp tip geometry overlying a micro-trench in the RRAM cell, which enhances the electric field within the dielectric data storage layer, minimizing non-uniformities by increasing the distance oxygen vacancies can be moved, thereby improving performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If RRAM cell size is decreased, then storage density is improved, but electrical operating parameter uniformity deteriorates
Solution Approach 1:
The top electrode is designed with a protrusion having a sharp tip geometry that creates a localized region of enhanced electric field strength directly over the micro-trench. This local quality modification allows the electric field to be concentrated where needed (in the dielectric data storage layer over the micro-trench) to improve oxygen vacancy movement and switching uniformity, while the rest of the electrode maintains its standard geometry. This resolves the contradiction by improving electrical uniformity locally without requiring overall cell size increase.
2Force
If a protrusion with sharp tip geometry is added to the top electrode, then electric field strength is improved, but device complexity increases
Solution Approach 1:
The top electrode is segmented into two distinct geometric regions: a main body portion and a protrusion portion with a sharp tip. This segmentation allows each region to serve a specific function - the main body provides overall electrical connection while the protrusion creates the enhanced electric field. The protrusion can be formed as a separate structural element that extends from the electrode, making the complexity localized rather than distributed throughout the entire electrode structure.
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 configuration enhances the uniformity of operating parameters and improves the electric performance of RRAM cells by increasing the strength of the electric field, leading to more reliable data storage states.
Implementation Method 1
The protrusion generates a region having an enhanced electric field within the dielectric data storage layer
Data Source
AI summary
The present disclosure relates to an RRAM (resistive random access memory) cell having a top electrode with a geometry configured to improve the electric performance of the RRAM cell, and an associated method of formation. In some embodiments, the RRAM cell has a lower insulating layer with a micro-trench located over a lower metal interconnect layer disposed within a lower inter-level dielectric (ILD) layer that overlies a semiconductor substrate. A bottom electrode is disposed over the micro-trench, and a dielectric data storage layer is located over the bottom electrode. A top electrode is disposed over the dielectric data storage layer. The top electrode has a protrusion that extends outward from a bottom surface of the top electrode at a position overlying the micro-trench. The protrusion generates a region having an enhanced electric field within the dielectric data storage layer, which improves performance of the RRAM cell.