Probing Dopant Locations in Silicon Nanocrystals via High Energy X-ray Diffraction and Reverse Monte Carlo Simulation

Katharine I. Hunter, Nicholas Bedford, Katelyn Schramke, Uwe R. Kortshagen

Research output: Contribution to journalArticle

2 Scopus citations

Abstract

Understanding the locations of dopant atoms in ensembles of nanocrystals is crucial to controlling the dopants' function. While electron microscopy and atom probe tomography methods allow investigation of dopant location for small numbers of nanocrystals, assessing large ensembles has remained a challenge. Here, we are using high energy X-ray diffraction (HE-XRD) and structure reconstruction via reverse Monte Carlo simulation to characterize nanocrystal structure and dopant locations in ensembles of highly boron and phosphorus doped silicon nanocrystals (Si NCs). These plasma-synthesized NCs are a particularly intriguing test system for such an investigation, as elemental analysis suggests that Si NCs can be "hyperdoped" beyond the thermodynamic solubility limit in bulk silicon. Yet, free carrier densities derived from local surface plasmon resonances suggest that only a fraction of dopants are active. We demonstrate that the structural characteristics garnered from HE-XRD and structure reconstruction elucidate dopant location and doping efficacy for doped Si NCs from an atomic-scale perspective.

Original languageEnglish (US)
Pages (from-to)852-859
Number of pages8
JournalNano letters
Volume20
Issue number2
DOIs
StatePublished - Feb 12 2020

Keywords

  • Doping
  • High energy X-ray diffraction
  • Nanocrystals
  • Reverse Monte Carlo simulation
  • Silicon
  • Structure reconstruction

How much support was provided by MRSEC?

  • Primary

Reporting period for MRSEC

  • Period 6

PubMed: MeSH publication types

  • Journal Article

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