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Carrier Transport01:21

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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.
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Quantum Transport in Large-Scale Patterned Nitrogen-Doped Graphene.

Aleksander Bach Lorentzen1, Mehdi Bouatou2, Cyril Chacon2

  • 1Department of Physics, Technical University of Denmark, DK-2800 Kongens Lyngby, Denmark.

Nanomaterials (Basel, Switzerland)
|September 28, 2023
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Summary
This summary is machine-generated.

Nitrogen doping in graphene can create electron beam focusing structures. However, scattering from nitrogen dopants degrades quantized conductance, impacting device performance.

Keywords:
graphenenitrogen dopingpatterningquantum transport calculationstight-binding model

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Spatial control of nitrogen dopant concentration in graphene at the nanoscale is achievable using molecular masks.
  • This technique enables the creation of structures for ballistic electron optics, potentially focusing electron beams by exploiting quantum wave propagation.

Purpose of the Study:

  • To theoretically investigate the impact of nitrogen dopant distribution and scattering on charge transport in graphene.
  • To explore the feasibility of creating current-guiding structures and understand their effect on quantized conductance.

Main Methods:

  • Large-scale Greens function transport calculations using a tight-binding approach.
  • Benchmarking of different tight-binding models for nitrogen in graphene, informed by density functional theory (DFT) and virtual crystal approximation (VCA).
  • Theoretical study of transport behavior at sharp n-p and n-n' interfaces with realistic nitrogen concentrations.

Main Results:

  • The random distribution and discreteness of nitrogen scattering centers significantly impact transport properties at doped interfaces.
  • Patterned high/low doping regions can form constrictions that guide electronic current.
  • Quantized conductance is substantially diminished by nitrogen scattering, though current focusing in p-n junctions remains viable.

Conclusions:

  • Nitrogen-doped graphene structures offer potential for current focusing applications.
  • Optimizing nitrogen concentration in guiding channels can preserve quantized conductance features and low-noise characteristics for device applications.