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Time-resolved single dopant charge dynamics in silicon.

Mohammad Rashidi1,2, Jacob A J Burgess3,4, Marco Taucer1,2

  • 1Department of Physics, University of Alberta, Edmonton, Alberta, Canada T6G 2J1.

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|October 27, 2016
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Summary
This summary is machine-generated.

Investigating single dopants with scanning tunnelling microscopy reveals their ionization dynamics. This study quantifies dopant behavior at nanosecond timescales, crucial for future semiconductor device development.

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Area of Science:

  • Solid State Physics
  • Materials Science
  • Nanotechnology

Background:

  • Approaching ultimate semiconductor miniaturization necessitates understanding single dopant effects.
  • Single dopant behavior impacts conventional device function and enables novel device concepts.
  • Sub-nanometre resolution is required, making scanning tunnelling microscopy (STM) a suitable tool.

Purpose of the Study:

  • To clarify the effects of single dopants on semiconductor devices.
  • To investigate dopant dynamics at nanosecond timescales, a significant experimental challenge.
  • To enable quantitative measurement of time-resolved single dopant ionization dynamics.

Main Methods:

  • Utilized time-resolved scanning tunnelling microscopy (TR-STM) and spectroscopy.
  • Employed atomically resolved, electronic pump-probe STM for precise measurements.
  • Probed transport through a surface dangling bond on silicon to amplify weak signals.

Main Results:

  • Achieved unprecedented, quantitative measurement of time-resolved single dopant ionization dynamics.
  • Successfully measured distinct ionization and neutralization rates of a single dopant.
  • Identified the physical processes governing these dopant dynamics.

Conclusions:

  • TR-STM provides a feasible method to measure weak signals from single dopant ionization.
  • The study quantifies dopant dynamics at the single-atom level.
  • Understanding these dynamics is critical for the future of semiconductor device miniaturization.