Carbon Storage Nonvolatile Memory Cell Architecture
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Solution Overview
Problem
Existing nonvolatile memory arrays face challenges in creating erasable or multi-state memory cells that are scalable to small sizes and capable of storing more than 1 bit per cell, with complex solutions like floating gate and SONOS memory cells being difficult to fabricate and operate effectively.
Innovation Solution
A nonvolatile memory cell design featuring a steering element, such as a diode, in series with a carbon-based storage element, allowing for rewritable cells with multiple memory levels by controlling resistivity states through electrical pulses, reducing leakage current and enabling efficient data storage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If floating gate and SONOS memory cells are used to achieve erasable or multi-state cells, then the memory cells can store multiple data states, but the device complexity and fabrication difficulty increase significantly
Solution Approach 1:
The patent extracts the complex three-terminal transistor structure from the memory cell design and replaces it with a simpler two-terminal structure using a carbon storage element in series with a selector element. This extraction removes the problematic floating gate and tunnel oxide layers while retaining the essential charge storage function, thereby reducing fabrication complexity while maintaining multi-state capability
Solution Approach 2:
The patent employs a carbon-based storage element that can be formed using simple deposition techniques rather than complex ion implantation or charge trapping structures. The carbon element serves as a disposable, easily fabricatable storage medium that achieves multi-state functionality through controlled deposition parameters, eliminating the need for sophisticated processing steps
2Adaptability or versatility
If floating gate and SONOS memory cells are used to achieve erasable or multi-state cells, then the memory cells can store multiple data states, but the difficulty of operating at very small dimensions increases
Solution Approach 1:
The patent transitions from planar two-dimensional scaling to vertical three-dimensional architecture by stacking multiple memory levels above a common substrate. Each memory level consists of a carbon storage element with selective areas that can be independently programmed, allowing multi-state storage without requiring further lateral dimension reduction, thus improving scalability to small dimensions
Solution Approach 2:
The patent divides the carbon storage element into multiple selective areas within a single memory cell, where each area can be independently programmed to different resistance states. This segmentation allows multiple data states to be stored in a single cell without increasing the overall cell footprint, enabling easy scaling to small dimensions while maintaining multi-state capability
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 solution provides a high-density, simplified architecture for nonvolatile memory cells with well-defined read current levels and multiple distinct memory states, reducing leakage current and enhancing manufacturing robustness by using a diode and carbon resistivity switching material.
Implementation Method 1
The storage element includes a carbon material and the memory cell includes a rewritable cell having multiple memory levels
Implementation Method 2
A nonvolatile memory cell design featuring a steering element, such as a diode, in series with a carbon-based storage element
Data Source
AI summary
A nonvolatile memory cell includes a steering element located in series with a storage element. The storage element includes a carbon material and the memory cell includes a rewritable cell having multiple memory levels.