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Related Concept Videos

Carrier Transport01:21

Carrier Transport

386
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:
386

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Controlling Charge Carrier Lifetime in Defective WSe2 Monolayer through Interface Engineering: a Time-Domain Ab

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Chemically functionalizing defective transition metal dichalcogenide (TMD) monolayers with C20 molecules or oxygen heals chalcogenide vacancies. This defect engineering enhances carrier charge lifetime in WSe2 beyond pristine materials.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Surface Chemistry

Background:

  • Defective transition metal dichalcogenide (TMD) monolayers exhibit trap states from chalcogenide vacancies, negatively impacting charge carrier lifetime and device efficiency.
  • Chemical functionalization offers a promising route for defect healing in 2D materials.

Purpose of the Study:

  • To investigate the efficacy of C20 molecular adsorption and oxygen passivation in mitigating nonradiative recombination and enhancing carrier charge lifetime in defective WSe2 monolayers.
  • To elucidate the underlying mechanisms responsible for improved carrier dynamics.

Main Methods:

  • Ab initio time-domain density functional theory (TDDFT).
  • Nonadiabatic molecular dynamics (NA-MD) simulations.
  • Analysis of energy gap variations, nonadiabatic coupling, and decoherence times.

Main Results:

  • Both C20 molecular adsorption and oxygen passivation significantly reduce nonradiative electron-hole recombination in defective WSe2.
  • These passivation methods enhance carrier charge lifetime, surpassing that of pristine WSe2 monolayers.
  • Improvements are attributed to modifications in energy gap, nonadiabatic coupling, and decoherence.

Conclusions:

  • Healing chalcogenide vacancies in defective TMDs via chemical functionalization provides precise control over charge carrier lifetime.
  • This defect engineering approach advances the development of 2D materials for electronic applications.