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Silicon Nanowires and Optical Stimulation for Investigations of Intra- and Intercellular Electrical Coupling
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Optical emission of InAs nanowires.

M Möller1, M M de Lima, A Cantarero

  • 1Instituto de Ciencia de los Materiales, Universidad de Valencia, Valencia, Spain. michael.moeller@uv.es

Nanotechnology
|August 28, 2012
PubMed
Summary
This summary is machine-generated.

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Wurtzite indium arsenide (InAs) nanowires show optical emissions from quantum wells and donor-acceptor pairs. Researchers observed a blue-shift and a new band, estimating the wurtzite InAs band gap energy.

Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Indium arsenide (InAs) nanowires are promising semiconductor materials.
  • Understanding their optical properties is crucial for device applications.
  • Wurtzite and zincblende phases in InAs nanowires can lead to unique electronic structures.

Purpose of the Study:

  • To analyze the optical emission properties of wurtzite InAs nanowires.
  • To investigate the origin of observed photoluminescence bands.
  • To determine the band gap energy of wurtzite InAs.

Main Methods:

  • Chemical beam epitaxy for nanowire growth.
  • Photoluminescence spectroscopy for optical analysis.
  • Variable excitation power and temperature measurements.

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Main Results:

  • Two main emission bands observed at low temperatures: quantum well recombination and donor-acceptor pair recombination.
  • A blue-shift in the quantum well emission with increasing excitation power, consistent with type-II band alignment.
  • An additional band attributed to wurtzite InAs band-to-band recombination at higher temperatures and excitation power.
  • Estimated lower bound for wurtzite InAs band gap energy at ~0.46 eV.

Conclusions:

  • The optical properties are dominated by quantum confinement effects and phase-boundary interactions.
  • The findings support theoretical predictions of type-II band alignment in wurtzite/zincblende InAs heterostructures.
  • The study provides valuable insights into the fundamental properties of wurtzite InAs nanowires.