Ferroelectric Memory Cell With Radial Electrode Structure
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Solution Overview
Problem
Current memory cell technologies face challenges in reducing the size and increasing the density of integrated circuits while maintaining the ability to store data in multiple states, particularly in nonvolatile memory cells that require efficient programmable materials and select devices.
Innovation Solution
The memory cell design incorporates a select device and a programmable device in series between two electrodes, with a ferroelectric material radially outward of the programmable device's sidewalls, allowing for efficient storage of data by determining the state of the programmable material and utilizing conductive lines to connect the components, enabling the formation of smaller and denser memory arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the number of components in individual memory cells is reduced to two electrodes with programmable material, then the size of finished constructions is reduced and processing is simplified, but the ability to store data in multiple states and maintain nonvolatile performance may be compromised
Solution Approach 1:
The memory cell is segmented into distinct functional components: a select device (diode or ovonic threshold switch) and a programmable material layer, arranged in a series configuration between two electrodes. This segmentation allows each component to be optimized for its specific function while maintaining overall cell compactness.
Solution Approach 2:
The memory cell employs composite material structures, combining the select device material with the programmable material in a layered configuration. This composite approach enables the cell to achieve both nonvolatile storage capability and multi-state retention while maintaining a reduced component count and smaller footprint.
2Reliability
If conventional nonvolatile memory cells are designed with multiple components to ensure data retention, then reliability is improved, but the density and size reduction of integrated circuits is limited
Solution Approach 1:
The select device and programmable material are merged into a single integrated structure where the programmable material serves dual purposes: as the storage medium and as part of the selection mechanism. This merging eliminates the need for separate select transistors and reduces the number of interconnect lines, thereby increasing integration density while maintaining data retention.
Solution Approach 2:
The programmable material is designed to perform multiple functions: storing data in multiple states, enabling selective access through its resistance characteristics, and providing nonvolatile retention. This multi-functionality allows a single component to replace what would traditionally require multiple separate components, thereby increasing productivity and integration density.
3Ease of manufacture
If the memory cell uses a simple two-electrode configuration with programmable material, then manufacturing complexity is reduced, but the capability to efficiently read and write multiple data states may be insufficient
Solution Approach 1:
The programmable material is positioned in a specific location between the select device and the second electrode, creating a localized region where multi-state storage occurs. This local quality approach allows the rest of the cell structure to remain simple and easy to manufacture, while the programmable material region provides the necessary adaptability for multi-state storage and efficient read/write operations.
Solution Approach 2:
The memory cell utilizes changes in the electrical parameters (resistance states) of the programmable material to encode multiple data states. By controlling the resistance of the programmable material through applied voltage pulses, the cell can store and retrieve multiple states (0, 1, and intermediate states) using a simple two-electrode configuration, thereby achieving versatility without increasing manufacturing complexity.
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 enables the creation of smaller, denser memory arrays capable of storing data in multiple states effectively, with the ferroelectric material enhancing the programmable device's functionality, thus addressing the need for improved nonvolatile memory cell performance.
Implementation Method 1
Ferroelectric material is radially outward of the outer sidewalls of the inner electrode
Data Source
AI summary
A memory cell includes a first electrode and a second electrode. A select device and a programmable device are in series with each other between the first and second electrodes. The select device is proximate and electrically coupled to the first electrode. The programmable device is proximate and electrically coupled to the second electrode. The programmable device includes a radially inner electrode having radially outer sidewalls. Ferroelectric material is radially outward of the outer sidewalls of the inner electrode. A radially outer electrode is radially outward of the ferroelectric material. One of the outer electrode or the inner electrode is electrically coupled to the select device. The other of the outer electrode and the inner electrode is electrically coupled to the second electrode. Arrays of memory cells are disclosed.