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Structural and spectroscopic studies of a nanostructured silicon-perovskite interface

Gonzalez-Rodriguez, Roberto ; Costa, Viviana C. P ; Delport, Géraud ; Frohna, Kyle ; Hoye, Robert L. Z ; Stranks, Samuel D ; Coffer, Jeffery L

Nanoscale, 2020-02, Vol.12 (7), p.4498-455 [Periódico revisado por pares]

England: Royal Society of Chemistry

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  • Título:
    Structural and spectroscopic studies of a nanostructured silicon-perovskite interface
  • Autor: Gonzalez-Rodriguez, Roberto ; Costa, Viviana C. P ; Delport, Géraud ; Frohna, Kyle ; Hoye, Robert L. Z ; Stranks, Samuel D ; Coffer, Jeffery L
  • Assuntos: Absorption spectra ; Diameters ; Evaluation ; Nanotubes ; Oxidation ; Perovskites ; Photoluminescence ; Photovoltaic cells ; Quantum efficiency ; Raman spectra ; Room temperature ; Silicon dioxide ; Thin films
  • É parte de: Nanoscale, 2020-02, Vol.12 (7), p.4498-455
  • Notas: housed within 30 nm ID Si and SiO
    NTs. See DOI
    formed within Si and SiO
    filled SiNTs; EDX linescans of perovskite filled SiNTs; table of EDX composition for samples prepared; XRD patterns of MAPbBr
    10.1039/c9nr09622a
    2
    3
    stabilized by various NTs; confocal PL image of Si NTs loaded with MAPbBr
    formed within SiNTs; HRTEM images of MAPbBr
    Electronic supplementary information (ESI) available: TEM images of empty and MAPbBr
    NTs; room temperature PL spectra of MAPbBr
    nanoscale Si boundaries; Raman spectra of as formed and annealed SiNTs; absorption spectra of MAPbBr
    PL intensity maps for MAPbBr
    ObjectType-Article-1
    SourceType-Scholarly Journals-1
    ObjectType-Feature-2
    content type line 23
  • Descrição: While extensively investigated in thin film form for energy materials applications, this work investigates the formation of APbBr 3 structures (A = CH 3 NH 3 + (MA), Cs + ) in silicon and oxidized silicon nanotubes (SiNTs) with varying inner diameter. We carefully control the extent of oxidation of the nanotube host and correlate the relative Si/Si oxide content in a given nanotube host with the photoluminescence quantum efficiency (PLQE) of the perovskite. Complementing these measurements is an evaluation of average PL lifetimes of a given APbBr 3 nanostructure, as evaluated by time-resolved confocal photoluminescence measurements. Increasing Si (decreasing oxide) content in the nanotube host results in a sensitive reduction of MAPbBr 3 PLQE, with a concomitant decrease in average lifetime ( τ ave ). We interpret these observations in terms of decreased defect passivation by a lower concentration of oxide species surrounding the perovskite. In addition, we show that the use of selected nanotube templates leads to more stable perovskite PL in air over time (weeks). Taken in concert, such fundamental observations have implications for interfacial carrier interactions in tandem Si/perovskite photovoltaics. This work investigates the formation of APbBr 3 structures (A = CH 3 NH 3 + (MA), Cs + ) in silicon and oxidized silicon nanotubes (SiNTs) with varying inner diameter, as well as the role of the interface in perovskite spectroscopic properties.
  • Editor: England: Royal Society of Chemistry
  • Idioma: Inglês
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