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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 28 May 2013, Vol.138(20)
Main Author: Mooney, Jonathan
Other Authors: Krause, Michael M. , Saari, Jonathan I. , Kambhampati, Patanjali
Format: Electronic Article Electronic Article
Language: English
Subjects:
ID: ISSN: 0021-9606 ; E-ISSN: 1089-7690 ; DOI: 10.1063/1.4807054
Link: http://dx.doi.org/10.1063/1.4807054
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recordid: aip_complete10.1063/1.4807054
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:
  • Articles
ispartof: The Journal of Chemical Physics, 28 May 2013, Vol.138(20)
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 ; E-ISSN: 1089-7690 ; DOI: 10.1063/1.4807054
fulltext: fulltext
issn:
  • 0021-9606
  • 1089-7690
  • 00219606
  • 10897690
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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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.
pubAmerican Institute of Physics
doi10.1063/1.4807054
pages204705
date2013-05-28