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A microscopic picture of surface charge trapping in semiconductor nanocrystals

Several different compositions of semiconductor nanocrystals are subjected to numerous spectroscopic techniques to elucidate the nature of surface trapping in these systems. We find a consistent temperature-dependent relationship between core and surface photoluminescence intensity and marked differ... Full description

Journal Title: The Journal of chemical physics 2013-05-28, Vol.138 (20), p.204705-204705
Main Author: Mooney, Jonathan
Other Authors: Krause, Michael M , Saari, Jonathan I , Kambhampati, Patanjali
Format: Electronic Article Electronic Article
Language: English
Subjects:
Publisher: United States
ID: ISSN: 0021-9606
Link: https://www.ncbi.nlm.nih.gov/pubmed/23742498
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recordid: cdi_proquest_miscellaneous_1365990899
title: A microscopic picture of surface charge trapping in semiconductor nanocrystals
format: Article
creator:
  • Mooney, Jonathan
  • Krause, Michael M
  • Saari, Jonathan I
  • Kambhampati, Patanjali
subjects:
  • Luminescence
  • Microscopy
  • Nanoparticles - chemistry
  • Semiconductors
  • Spectrum Analysis, Raman
  • Surface Properties
  • Temperature
ispartof: The Journal of chemical physics, 2013-05-28, Vol.138 (20), p.204705-204705
description: Several different compositions of semiconductor nanocrystals are subjected to numerous spectroscopic techniques to elucidate the nature of surface trapping in these systems. We find a consistent temperature-dependent relationship between core and surface photoluminescence intensity and marked differences in electron-phonon coupling for core and surface states based on ultrafast measurements and Resonance Raman studies, respectively. These results support a minimal model of surface charge trapping applicable to a range of nanocrystal systems involving a single surface state in which the trapped charge polarization leads to strong phonon couplings, with transitions between the surface and band edge excitonic states being governed by semiclassical electron-transfer theory.
language: eng
source:
identifier: ISSN: 0021-9606
fulltext: no_fulltext
issn:
  • 0021-9606
  • 1089-7690
url: Link


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descriptionSeveral different compositions of semiconductor nanocrystals are subjected to numerous spectroscopic techniques to elucidate the nature of surface trapping in these systems. We find a consistent temperature-dependent relationship between core and surface photoluminescence intensity and marked differences in electron-phonon coupling for core and surface states based on ultrafast measurements and Resonance Raman studies, respectively. These results support a minimal model of surface charge trapping applicable to a range of nanocrystal systems involving a single surface state in which the trapped charge polarization leads to strong phonon couplings, with transitions between the surface and band edge excitonic states being governed by semiclassical electron-transfer theory.
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abstractSeveral different compositions of semiconductor nanocrystals are subjected to numerous spectroscopic techniques to elucidate the nature of surface trapping in these systems. We find a consistent temperature-dependent relationship between core and surface photoluminescence intensity and marked differences in electron-phonon coupling for core and surface states based on ultrafast measurements and Resonance Raman studies, respectively. These results support a minimal model of surface charge trapping applicable to a range of nanocrystal systems involving a single surface state in which the trapped charge polarization leads to strong phonon couplings, with transitions between the surface and band edge excitonic states being governed by semiclassical electron-transfer theory.
copUnited States
pmid23742498
doi10.1063/1.4807054