Related Experiment Video
Updated: Apr 20, 2026
10:36
Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
Published on: April 12, 2018
12.1K
Giant electrode effect on tunnelling electroresistance in ferroelectric tunnel junctions
Rohit Soni1, Adrian Petraru1, Paul Meuffels2
1Nanoelektronik, Technische Fakultät, Christian-Albrechts-Universität zu Kiel, 24143 Kiel, Germany.
Nature Communications
|November 18, 2014
Summary
The tunnelling electroresistance (TER) effect in ferroelectric tunnel junctions (FTJs) shows a significant electrode influence. This study clarifies the ferroelectric interface role, distinguishing it from redox effects in these quantum nanostructures.
Area of Science:
- Condensed matter physics
- Materials science
- Nanotechnology
Background:
- Ferroelectric tunnel junctions (FTJs) exhibit the tunnelling electroresistance (TER) effect, crucial for next-generation electronics.
- Understanding interfacial effects is key to optimizing FTJ performance for memory and computing.
Purpose of the Study:
- To investigate the influence of electrode materials on the TER effect in asymmetric FTJs.
- To differentiate ferroelectric-driven TER from electrochemical resistance switching.
Main Methods:
- Fabrication of epitaxial FTJs with BaTiO(3) barriers and La(0.7)Sr(0.3)MnO(3) bottom electrodes.
- Integration of different top electrodes (Au, Cu) to study interfacial effects.
- Comprehensive electrical characterization of the junctions.
Main Results:
- Demonstrated a significant 'giant electrode effect' on the TER in asymmetric FTJs.
- Attributed the observed TER phenomena to microscopic interfacial effects of ferroelectric origin.
- Distinguished ferroelectric TER from redox-based switching, observed at higher voltages.
Conclusions:
- The electrode material plays a critical role in the TER effect of FTJs.
- Interfacial engineering is essential for harnessing the full potential of FTJs in electronic applications.
- This work clarifies fundamental aspects of TER, paving the way for advanced device development.
More Related Videos
11:33All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
10.4K
05:39Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
10.5K
Related Concept Videos
01:22Biasing of FET
993
Biasing a Junction Field Effect Transistor (JFET) is crucial for setting operational parameters and ensuring efficient functioning in electronic circuits. JFETs are characterized by using a single carrier type in N-channel or P-channel configurations, where the channel is surrounded by PN junctions. These junctions are central to the device's ability to control current flow.
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
In an N-channel JFET, the structure consists of N-type material forming the channel on a P-type substrate, with the...
993
01:24Metal-Semiconductor Junctions
1.4K
The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
1.4K
01:29Field Effect Transistor
1.8K
Field-effect transistors (FETs) are integral to electronic circuits and distinguished by their three-terminal setup: the gate, drain, and source. These transistors operate as unipolar devices, which utilize either electrons or holes as charge carriers, in contrast to bipolar transistors, which use both types of carriers. The primary function of the FET is to modulate the flow of these carriers from the source to the drain through a channel. The voltage difference between the gate and source...
1.8K
01:30The Electrical Double Layer
210
In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
210
01:27Biasing of Metal-Semiconductor Junctions
867
Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
867
01:11P-N junction
1.8K
A p-n junction is formed when p-type and n-type semiconductor materials are joined together. At the interface of the p-n junction, holes from the p-side and electrons from the n-side begin to diffuse into the opposite sides due to the concentration gradient. This diffusion of carriers leads to a region around the junction where there are no free charge carriers, known as the depletion region. The charge density within the depletion region for the n-side and p-side can be described by the...
1.8K