Related Experiment Video
Updated: Jun 3, 2025
09:49
In Situ Transmission Electron Microscopy with Biasing and Fabrication of Asymmetric Crossbars Based on Mixed-Phased a-VOx
Published on: May 13, 2020
4.0K
Density Functional Theory Insights into Conduction Mechanisms in Perovskite-Type RCoO3 Nanofibers for Future
Quanli Hu1, Hanqiong Luo1, Chao Song1
1Inner Mongolia Key Lab of Solid State Chemistry for Battery, Inner Mongolia Engineering Research Center of Lithium-Sulfur Battery Energy Storage, College of Chemistry and Materials Science, Inner Mongolia Minzu University, Tongliao 028000, China.
Molecules (Basel, Switzerland)
|January 8, 2025
Summary
Rare-earth cobaltate perovskites show promise for resistive random-access memory (RRAM) devices. Oxygen vacancies in LaCoO3, NdCoO3, and SmCoO3 facilitate conductive filaments, enabling potential applications in advanced data storage.
Area of Science:
- Materials Science
- Solid State Physics
- Nanotechnology
Background:
- The proliferation of artificial intelligence and the Internet of Things necessitates advancements in data storage technologies.
- Resistive random-access memory (RRAM) is a key area of research for future data storage solutions.
- Perovskite-type rare-earth metal oxides, specifically rare-earth cobaltates (RCoO3), exhibit unique electronic properties suitable for RRAM applications.
Purpose of the Study:
- To investigate the resistive switching effect in rare-earth cobaltate (RCoO3) structures.
- To explore the potential of LaCoO3, NdCoO3, and SmCoO3 as materials for RRAM devices.
- To understand the role of oxygen vacancies in the resistive switching mechanism.
Main Methods:
- Fabrication of perovskite materials (LaCoO3, NdCoO3, SmCoO3) using electrospinning and calcination.
- Investigation of resistive switching phenomena in Pt/RCoO3/Pt devices.
- Analysis of electronic properties, including barrier height and conductive filament characteristics.
Main Results:
- Oxygen vacancies were identified as crucial for forming conductive filaments in RCoO3.
- The formation of conductive filaments dictates the resistance transition mechanism in Pt/RCoO3/Pt devices.
- Key electronic properties, such as barrier height and filament shape, were characterized.
Conclusions:
- LaCoO3, NdCoO3, and SmCoO3 demonstrate significant potential for application in memory storage devices.
- The understanding of oxygen vacancy-mediated conductive filaments provides insights into RRAM device operation.
- These rare-earth cobaltates represent promising candidates for next-generation data storage technologies.
Related Concept Videos
01:17Theory of Metallic Conduction
1.3K
The conduction of free electrons inside a conductor is best described by quantum mechanics. However, a classical model makes predictions close to the results of quantum mechanics. It is called the theory of metallic conduction.
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
In this theory, Newton's second law of motion is used to determine the acceleration of an electron in the presence of an applied electric field. Then, its velocity is expressed via this acceleration.
An electron moves through the crystal, containing positive ions,...
1.3K
01:25MOS Capacitor
699
A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
699
01:13Electrical Conductivity
1.1K
In perfect conductors, the electric field inside is always zero due to the abundance of free electrons, which nullify any field by flowing. As a result, any residual charge resides on the surface.
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
In a practical conductor, an applied electric field may be sustained, causing a flow of electrons, which produce a current. The differential form of the current, the current density, is related to the electric field.
More generally, it is related to the force per unit charge, which involves the...
1.1K
01:14Design Example: Resistive Touchscreen
279
A device engineer plays a crucial role in designing user interfaces for mobile devices. One such interface is the resistive touchscreen, which fundamentally consists of two metallic layers: a flexible upper layer and a rigid lower layer, separated by a narrow gap. The high resistance between these two layers is a key characteristic of this design.
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
When a user touches the screen, the two layers make contact at a specific point known as the touchpoint. This contact reduces the resistance between...
279
01:21Carrier Transport
399
The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
399
01:19Ohm's Law
689
Resistors are fundamental components in electrical circuits, often manufactured from metallic alloys or carbon compounds. They model a material's ability to resist the flow of electric current, a characteristic that is crucial in controlling and regulating electrical power within a circuit.
This current-resisting behavior of resistors is governed by Ohm's law, which states that the voltage across a resistor is directly proportional to the current flowing through it.
This current-resisting behavior of resistors is governed by Ohm's law, which states that the voltage across a resistor is directly proportional to the current flowing through it.
689