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Related Concept Videos

P-N junction01:11

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...
Schottky Barrier Diode01:27

Schottky Barrier Diode

Schottky barrier diodes are specialized semiconductor devices characterized by their unique construction. This construction involves combining a metal layer with a moderately doped n-type semiconductor material. This combination leads to the formation of a Schottky barrier, a pivotal element that defines the diode's operational characteristics. The core functionality of Schottky barrier diodes is their capacity to allow current to flow in only one direction due to their distinctive...
Metal-Semiconductor Junctions01:24

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...
Biasing of P-N Junction01:16

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...
Diode: Forward bias01:20

Diode: Forward bias

In semiconductor devices, diodes play a crucial role in directing current flow, and its operation is primarily categorized into forward bias and reverse bias. A diode is said to be forward-biased when its p-type region is connected to the positive terminal of a battery and its n-type region is linked to the negative terminal. This configuration reduces the potential barrier within the diode, allowing current to flow easily from the p to the n-type region.
The behavior of a diode in forward bias...
Photoelectric Effect02:26

Photoelectric Effect

When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Preparation and Use of Photocatalytically Active Segmented Ag|ZnO and Coaxial TiO2-Ag Nanowires Made by Templated Electrodeposition
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Multisegment CdTe nanowire homojunction photodiode.

Elena Matei1, Lucian Ion, Stefan Antohe

  • 1National Institute of Materials Physics, Atomistilor Street 105 bis, Magurele, Ilfov 77125, Romania.

Nanotechnology
|February 18, 2010
PubMed
Summary
This summary is machine-generated.

Researchers created multisegment cadmium telluride (CdTe) nanowires using electrochemical deposition. By controlling deposition potentials, they tailored the nanowire

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Nanoporous membranes enable precise fabrication of nanostructures.
  • Electrochemical deposition is a versatile technique for synthesizing semiconductor materials.
  • Controlling deposition parameters is crucial for tailoring nanowire properties.

Purpose of the Study:

  • To prepare multisegment cadmium telluride (CdTe) homojunction diode nanowires.
  • To investigate the influence of deposition overpotential on nanowire composition and properties.
  • To demonstrate the fabrication of functional nanostructures with tunable electronic and optical characteristics.

Main Methods:

  • Electrochemical deposition within nanoporous ion track membranes.
  • Utilizing controlled voltage pulse patterns for sequential deposition.
  • Characterization via scanning electron microscopy (SEM), energy dispersive X-ray analysis (EDX), optical spectroscopy, and X-ray diffraction (XRD).
  • Measurement of current-voltage (I-V) characteristics.

Main Results:

  • Successfully fabricated multisegment CdTe nanowires with controllable composition.
  • Demonstrated that deposition overpotential dictates nanowire properties.
  • Achieved both ohmic and rectifying behaviors in CdTe nanowire devices by adjusting voltage pulses.
  • Observed light sensitivity characteristic of CdTe in the synthesized semiconducting nanowires.

Conclusions:

  • Electrochemical deposition in nanoporous membranes offers a reproducible method for creating tailored CdTe nanowires.
  • Tunable transport properties (ohmic/rectifying) can be achieved by controlling deposition potentials.
  • These functional nanostructures hold significant potential for optoelectronic applications.