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Electron-Surface Scattering from First-Principles.

Chenmu Zhang1, Yuanyue Liu1

  • 1Texas Materials Institute and Department of Mechanical Engineering, The University of Texas at Austin, Austin, Texas 78712, United States.

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|September 26, 2024
PubMed
Summary
This summary is machine-generated.

We developed a new parameter-free method to accurately calculate electron-surface scattering in copper interconnects. This reveals that the (111) surface is less conductive than (001), challenging common assumptions.

Keywords:
Boltzmann transport theorycarrier transportfinite-size effect on resistivityfirst-principles calculationsinterconnectsmetalssurface scattering

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Surface Science

Background:

  • Electron-surface scattering significantly impacts electronic transport properties, crucial for microelectronics.
  • Copper interconnects face limitations due to strong surface scattering, hindering conductivity in downscaled devices.
  • Current theories for surface scattering lack predictive power due to reliance on unknown phenomenological parameters.

Purpose of the Study:

  • To develop an accurate, parameter-free computational approach for electronic transport with surface scattering.
  • To investigate the influence of different surface orientations on the electrical conductivity of copper films.
  • To provide a more accurate phenomenological model for surface scattering.

Main Methods:

  • Development of a novel, parameter-free first-principles calculation method for electronic transport.
  • Application of the method to simulate conductivity in copper films with (001) and (111) surface orientations.
  • Analysis of electronic structure symmetry to explain observed conductivity differences.

Main Results:

  • The (111) copper surface exhibits lower electrical conductivity compared to the (001) surface, contrary to expectations.
  • Electronic structure symmetry is identified as the key factor influencing conductivity variations across different surface orientations.
  • A refined phenomenological model shows improved agreement with first-principles calculations.

Conclusions:

  • The developed parameter-free method enables accurate prediction of electronic transport phenomena influenced by surface scattering.
  • Findings challenge conventional understanding of surface orientation effects on conductivity in metallic films.
  • This work provides fundamental insights for designing advanced electronic materials and devices.