Non-volatile Memory Cell With In-cell Resistor for Transient Current Control
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Solution Overview
Problem
Non-volatile memory cells face challenges in managing high transient currents during programming, which can lead to subsequent high current operation and affect data retention, especially in devices lacking a dielectric resistor to control filament formation.
Innovation Solution
Incorporating a dielectric resistor in series with the steering element and metal oxide storage element, which prevents conductive filament formation through it during programming, thereby maintaining unchanged resistivity and minimizing transient currents, and allowing for smaller filament formation for low current operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a dielectric resistor is added in series with the storage element, then transient current during programming is reduced and data retention is improved, but device complexity increases
Solution Approach 1:
The dielectric resistor layer is merged with the metal oxide storage element to form an integrated structure. The resistor is formed in-situ within the same device stack, eliminating the need for separate external resistor components and reducing overall device complexity while maintaining the reliability benefits of transient current suppression.
Solution Approach 2:
The metal oxide layer serves dual functions: as the storage element that forms conductive filaments for data storage, and as the dielectric resistor that limits transient current during programming. This multi-functionality reduces the need for additional dedicated resistor components, thereby simplifying the device structure while improving data retention.
2Object-generated harmful factors
If a dielectric resistor is used to control filament formation, then transient current is minimized, but manufacturing precision requirements increase
Solution Approach 1:
The resistivity of the dielectric resistor is controlled by adjusting fabrication parameters such as oxidation conditions, temperature, and duration. By changing these processing parameters, the resistor value can be tuned to achieve optimal transient current suppression without requiring extremely tight dimensional tolerances, thus reducing manufacturing precision requirements.
Solution Approach 2:
The dielectric resistor properties are optimized locally at the interface with the metal oxide storage element, where filament formation occurs. The resistor provides localized current control exactly where needed during programming, suppressing transient currents at the critical interface region without requiring uniform precision across the entire device 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
The solution results in lower read currents and improved data retention by managing resistance and filament size, ensuring stable operation with minimal detectable transient currents and maintaining low current levels even after multiple set and reset operations.
Implementation Method 1
at least one electrically conductive filament is formed through the metal oxide storage element, to switch the metal oxide storage element from a higher resistivity state to a lower resistivity state
Implementation Method 2
No conductive filament is formed through the dielectric resistor during the forming programming step such that a resistivity of the dielectric resistor is substantially unchanged after the forming programming step
Data Source
AI summary
A non-volatile memory cell includes a first electrode, a steering element, a metal oxide storage element located in series with the steering element, a dielectric resistor located in series with the steering element and the metal oxide storage element, and a second electrode.