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Electron and Hole Adducts Formed in Illuminated InP Colloidal Quantum Dots Studied by Electron Paramagnetic Resonance

Mićić, Olga I ; Nozik, Arthur J ; Lifshitz, Efrat ; Rajh, Tijana ; Poluektov, Oleg G ; Thurnauer, Marion C

J. Phys. Chem. B, 2002-05, Vol.106 (17), p.4390-4395 [Periódico revisado por pares]

United States: American Chemical Society

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  • Título:
    Electron and Hole Adducts Formed in Illuminated InP Colloidal Quantum Dots Studied by Electron Paramagnetic Resonance
  • Autor: Mićić, Olga I ; Nozik, Arthur J ; Lifshitz, Efrat ; Rajh, Tijana ; Poluektov, Oleg G ; Thurnauer, Marion C
  • Assuntos: ADDUCTS ; BIPHENYL ; DEFECTS ; ELECTRON SPIN RESONANCE ; ELECTRONS ; ETCHING ; ILLUMINANCE ; LINE WIDTHS ; MAGNETIC RESONANCE ; PHYSICS OF ELEMENTARY PARTICLES AND FIELDS ; QUANTUM DOTS ; REDUCING AGENTS ; SODIUM
  • É parte de: J. Phys. Chem. B, 2002-05, Vol.106 (17), p.4390-4395
  • Notas: istex:3BD2E4BDA5BB78A0801C3070A32E5F8910AFC181
    ark:/67375/TPS-1S6TPBNF-7
    FOR
    ANL/CHM/JA-41258
    USDOE Office of Science (SC)
    DE-AC02-06CH11357
  • Descrição: An electron paramagnetic resonance (EPR) study of photoexcited colloidal InP quantum dots (QD) shows the formation of electron and hole adducts. An EPR signal at g = 0.58 is assigned to a nonradiative hole trap that does not form immediately upon illumination, but forms only after the illuminated sample ages and becomes stabilized at room temperature; it then becomes permanent at the InP QD surface. This signal completely disappears upon electron injection into the QD from a reducing agent (sodium biphenyl). Light immediately quenches the signal at g = 0.58, and it re-forms reversibly when the light is turned off. A signal at g = 2.055 is assigned to electron surface traps, and it appears in nonetched QD samples; it completely disappears after etching with HF. A signal at g = 2.001 has a very narrow line width and is assigned to delocalized mobile holes that are located in the QD core. A defect model for InP QDs is proposed based on the EPR results reported here plus results from optically detected magnetic resonance experiments reported separately.
  • Editor: United States: American Chemical Society
  • Idioma: Inglês
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  • Realização: ABCD-USP USP   Logos de Redes Sociais: Freepik

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