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Related Concept Videos

Photoluminescence: Applications01:14

Photoluminescence: Applications

Photoluminescence offers a wide range of applications due to its inherent sensitivity and selectivity. This technique allows for both direct and indirect analyses of the analyte. Direct quantitative analysis is possible when the analyte exhibits a favorable quantum yield for fluorescence or phosphorescence. However, an indirect analysis may be feasible if the analyte is not fluorescent or phosphorescent, or if the quantum yield is unfavorable. Indirect methods include reacting the analyte with...
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...

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Related Experiment Video

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Synthesis of Hierarchical ZnO/CdSSe Heterostructure Nanotrees
06:50

Synthesis of Hierarchical ZnO/CdSSe Heterostructure Nanotrees

Published on: November 29, 2016

Electrically driven light emission from individual CdSe nanowires.

Yong-Joo Doh1, Kristin N Maher, Lian Ouyang

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, USA.

Nano Letters
|December 5, 2008
PubMed
Summary
This summary is machine-generated.

Electroluminescence in cadmium selenide (CdSe) nanowires occurs at the interface with a positively biased electrode. This light emission is linked to a Schottky barrier and rapid potential drop, suggesting hole leakage or inelastic scattering.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Individual nanowires are promising for electronic and optoelectronic devices.
  • Understanding electroluminescence (EL) mechanisms in nanowire-based devices is crucial for their development.
  • Cadmium selenide (CdSe) nanowires are investigated for their semiconductor properties.

Purpose of the Study:

  • To investigate the origin of electroluminescence (EL) in individual n-type CdSe nanowire devices.
  • To correlate optical and electrical properties with surface potential and band profiles.
  • To elucidate the physical mechanisms responsible for light emission at the nanowire-electrode interface.

Main Methods:

  • Fabrication of three-terminal devices using individual n-type CdSe nanowires.
  • Simultaneous electroluminescence (EL) and electrical measurements.
  • Kelvin probe microscopy for surface potential profiling.
  • Scanning photocurrent microscopy for band profile analysis.

Main Results:

  • Electroluminescence (EL) was observed near the contact between the CdSe nanowire and a positively biased electrode.
  • Kelvin probe microscopy revealed an abrupt potential drop at the EL emission site.
  • Scanning photocurrent microscopy indicated an n-type Schottky barrier at the nanowire-electrode interface.

Conclusions:

  • The observed electroluminescence (EL) originates from the n-type Schottky barrier at the nanowire-electrode interface.
  • Light emission is attributed to hole leakage or inelastic scattering induced by the rapid potential drop.
  • These findings provide insight into the fundamental processes governing light emission in nanowire devices.