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Related Concept Videos

Carrier Generation and Recombination01:22

Carrier Generation and Recombination

Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
This process is given by the generation rate G and is efficient due to the conservation of momentum between the valence band maximum and conduction band minimum.
Indirect generation involves an...
Carrier Transport01:21

Carrier Transport

The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:

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Sub-Picosecond Carrier Dynamics Explored using Automated High-Throughput Studies of Doping Inhomogeneity within a

Ruqaiya Al-Abri1, Nawal Al Amairi1, Stephen Church1

  • 1Department of Physics and Astronomy and the Photon Science Institute, University of Manchester, Oxford Road, Manchester, M13 9PL, UK.

Small (Weinheim an Der Bergstrasse, Germany)
|April 24, 2023
PubMed
Summary

This study reveals inhomogeneity in semiconductor nanomaterials using photoluminescence spectroscopy and Bayesian analysis. It uncovers correlations between doping and diameter, and details hot-carrier dynamics in zinc-doped gallium arsenide nanowires.

Keywords:
Bayesianhigh-throughputnanowiresphotoluminescencesplit-off

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid State Physics

Background:

  • Bottom-up synthesis of semiconductor nanomaterials often leads to property variations due to factors like geometry, crystal quality, stoichiometry, and doping.
  • Inhomogeneity in nanomaterial properties complicates their application and understanding of fundamental electronic behavior.

Purpose of the Study:

  • To investigate the inhomogeneity in zinc-doped gallium arsenide nanowires.
  • To correlate doping concentration with nanowire diameter.
  • To reveal sub-picosecond hot-carrier dynamics in these nanomaterials.

Main Methods:

  • High-throughput photoluminescence spectroscopy of over 11,000 individual nanowires.
  • Application of a Bayesian statistical approach to analyze spectral data.
  • Exploitation of carrier lifetime variations to probe dynamics.

Main Results:

  • Demonstrated inhomogeneity in electronic properties across the nanowire population.
  • Established a correlation between zinc doping and nanowire diameter.
  • Identified hot-carrier recombination as the source of the photoluminescence lineshape.
  • Revealed interband electronic dynamics on a sub-picosecond timescale.

Conclusions:

  • High-throughput spectroscopy combined with Bayesian analysis offers powerful insights into inhomogeneous nanomaterial systems.
  • This approach can elucidate complex electronic dynamics without requiring advanced pump-probe techniques.
  • The findings provide a deeper understanding of carrier behavior in doped semiconductor nanowires.