Suppression of auger recombination in ""giant"" core/shell nanocrystals Metadata

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Title

  • Main Title Suppression of auger recombination in ""giant"" core/shell nanocrystals

Creator

  • Author: Garcia Santamaria, Florencio
    Creator Type: Personal
    Creator Info: Los Alamos National Laboratory
  • Author: Vela, Javier
    Creator Type: Personal
    Creator Info: Los Alamos National Laboratory
  • Author: Schaller, Richard D
    Creator Type: Personal
    Creator Info: Los Alamos National Laboratory
  • Author: Hollingsworth, Jennifer A
    Creator Type: Personal
    Creator Info: Los Alamos National Laboratory
  • Author: Klimov, Victor I
    Creator Type: Personal
    Creator Info: Los Alamos National Laboratory
  • Author: Chen, Yongfen
    Creator Type: Personal
    Creator Info: NON LANL

Contributor

  • Sponsor: United States. Department of Energy.
    Contributor Type: Organization

Publisher

  • Name: Los Alamos National Laboratory
    Place of Publication: [New Mexico]
    Additional Info: LANL

Date

  • Creation: 2009-01-01

Language

  • English

Description

  • Content Description: Many potential applications of semiconductor nanocrystals are hindered by nonradiative Auger recombination wherein the electron-hole (exciton) recombination energy is transferred to a third charge carrier. This process severely limits the lifetime and bandwidth of optical gain, leads to large nonradiative losses in light emitting diodes and photovoltaic cells, and is believed to be responsible for intermittency ('blinking') of emission from single nanocrystals. The development of nanostructures in which Auger recombination is suppressed has been a longstanding goal in colloidal nanocrystal research. Here, we demonstrate that such suppression is possible using so-called 'giant' nanocrystals that consist of a small CdSe core and a thick CdS shell. These nanostructures exhibit a very long biexciton lifetime ({approx}10 ns) that is likely dominated by radiative decay instead of non-radiative Auger recombination. As a result of suppressed Auger recombination, even high-order multiexcitons exhibit high emission efficiencies, which allows us to demonstrate optical amplification with an extraordinarily large bandwidth (>500 me V) and record low excitation thresholds.

Subject

  • Keyword: Amplification
  • Keyword: Nanostructures
  • Keyword: Photovoltaic Cells
  • Keyword: Excitation
  • Keyword: Recombination
  • STI Subject Categories: 36
  • Keyword: Excitons
  • Keyword: Charge Carriers
  • Keyword: Radiative Decay
  • Keyword: Lifetime
  • Keyword: Light Emitting Diodes

Source

  • Journal Name: Science

Collection

  • Name: Office of Scientific & Technical Information Technical Reports
    Code: OSTI

Institution

  • Name: UNT Libraries Government Documents Department
    Code: UNTGD

Resource Type

  • Article

Format

  • Text

Identifier

  • Report No.: LA-UR-09-01139
  • Report No.: LA-UR-09-1139
  • Grant Number: AC52-06NA25396
  • Office of Scientific & Technical Information Report Number: 956462
  • Archival Resource Key: ark:/67531/metadc930034
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