Resistance Change Device With Ferroelectric Layer For Data Retention
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Solution Overview
Problem
Resistance change devices face challenges in maintaining data retention characteristics due to the instability of conductive filaments, which are prone to oxidation and disconnection, leading to degradation of resistance states and information retention.
Innovation Solution
Incorporating a ferroelectric layer with remanent polarization that generates an electric field, which induces electron flow and suppresses oxidation, thereby enhancing the structural reliability and integrity of conductive filaments in the resistance switching layer, ensuring improved data retention and stability of resistance states.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conductive filament is formed in the resistance switching layer to enable resistance change, then the device can store logic information, but the conductive filament is unstable and prone to oxidation and disconnection, leading to poor data retention
Solution Approach 1:
A ferroelectric layer is introduced as an intermediary between the resistance switching layer and the electrode. This ferroelectric layer generates a spontaneous electric field that acts as a mediator to suppress oxidation of the conductive filament and maintain its structural integrity, thereby improving data retention without affecting the resistance switching function
Solution Approach 2:
The invention changes the electrical parameter (electric field) by introducing a ferroelectric layer with remanent polarization. This electric field parameter modification creates a protective environment that prevents filament oxidation and disconnection, resolving the stability issue while maintaining the resistance change capability
2Ease of manufacture
If the conductive filament structure is simplified for easier manufacture, then fabrication becomes easier, but the filament becomes more susceptible to oxidation and disconnection
Solution Approach 1:
The ferroelectric layer serves as a protective intermediary that shields the conductive filament from oxidation without complicating the fabrication process. It can be deposited using standard thin-film techniques, maintaining ease of manufacture while significantly improving structural reliability through the spontaneous electric field it generates
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 ferroelectric layer's electric field continuously induces electron flow, maintaining the conductive filament's integrity and improving data retention characteristics, reducing standby and operating power consumption, and enhancing the reliability of resistance change devices.
Implementation Method 1
a ferroelectric layer having a remanent polarization
Implementation Method 2
The remanent polarization generates an electric field that induces an inflow of electrons
Implementation Method 3
generates an electric field that induces an inflow of electrons from at least one of the first and second electrodes into the conductive filament
Data Source
AI summary
A resistance change device according to an embodiment of the disclosure includes a first electrode, a resistance switching layer disposed on the first electrode, a second electrode disposed on the resistance switching layer, a ferroelectric layer disposed on the second electrode, and a third electrode disposed on the ferroelectric layer.