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P-N junction

P-N junction

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...

Metal-Semiconductor Junctions

Metal-Semiconductor Junctions

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 semiconductor's...

Induced Electric Fields

Induced Electric Fields

The fact that emfs are induced in circuits implies that work is being done on the conduction electrons in the wires. What can possibly be the source of this work? We know that it’s neither a battery nor a magnetic field, as a battery does not have to be present in a circuit where current is induced, and magnetic fields never do any work on moving charges. The source of the work is in fact an electric field that is induced in the wires. For example, if a stationary conductor is placed in a...

Induced Electric Fields: Applications

Induced Electric Fields: Applications

An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...

Electrochemical Systems

Electrochemical Systems

Electrochemical systems provide a fascinating insight into the dynamic interplay of charged species within various phases. One notable example is the interaction between a membrane permeable to K⁺ ions but not to Cl⁻ ions, separating an aqueous KCl solution from pure water. As K⁺ ions diffuse through the membrane, they generate net charges on each phase, leading to a potential difference between them.Similarly, when a piece of Zn is immersed in an aqueous ZnSO₄ solution, the Zn metal, composed...

Biasing of P-N Junction

Biasing of P-N Junction

The operation of a p-n junction diode involves various biasing conditions, including forward bias, reverse bias, and equilibrium.
In equilibrium, no external voltage is applied across the p-n junction. The depletion region is formed at the junction interface due to the diffusion of carriers, which leaves behind charged dopants, acceptors on the p-side, and donors on the n-side. These immobile charges create an electric field that prevents further diffusion of carriers. The related energy band...

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Related Experiment Video

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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating

Electric-field Control of Electronic States in WS₂ Nanodevices by Electrolyte Gating

Published on: April 12, 2018

Void formation induced electrical switching in phase-change nanowires.

Stefan Meister¹, David T Schoen, Mark A Topinka

¹Department of Materials Science and Engineering, Stanford University, Stanford, California 94305, USA.

|April 16, 2009

Summary

Phase-change germanium telluride (GeTe) nanowires switch memory states by forming and closing voids, not just crystalline-amorphous changes. This novel void mechanism offers new possibilities for nonvolatile information storage devices.

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Area of Science:

Materials Science
Nanotechnology
Solid-State Physics

Background:

Nonvolatile information storage relies on solid-state structural transformations and electronic property changes.
Phase-change memories are a key technology utilizing these mechanisms.

Purpose of the Study:

To directly correlate nanoscale structural transformations with electrical switching in GeTe nanowire devices.
To investigate the dominant switching mechanism in phase-change GeTe single-nanowire devices.

Main Methods:

Utilized phase-change GeTe single-nanowire devices.
Employed ex situ and in situ transmission electron microscopy (TEM).
Correlated nanoscale structural changes with electrical switching behavior.

Main Results:

The dominant switching mechanism involves the opening and closing of voids within the nanowires due to material migration.
Observed composition changes and the formation of banded structural defects during switching.
Identified a novel void-based mechanism distinct from traditional crystalline-amorphous transformations.

Conclusions:

Void formation and closure represent a new mechanism for phase-change memory operation.
The findings are significant for advancing phase-change memory technology.
This research impacts devices reliant on nanoscale structural transformations for operation.