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Metal-Semiconductor Junctions01:24

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Ultrahigh Density Array of Vertically Aligned Small-molecular Organic Nanowires on Arbitrary Substrates
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Published on: June 18, 2013

Solution-based II-VI core/shell nanowire heterostructures.

Jim A Goebl1, Robert W Black, James Puthussery

  • 1Department of Chemistry and Biochemistry and Notre Dame Radiation Laboratory, University of Notre Dame, Notre Dame, Indiana 46556, USA.

Journal of the American Chemical Society
|October 14, 2008
PubMed
Summary
This summary is machine-generated.

We synthesized core/shell nanowires (NWs) like CdS/CdSe using solution-phase chemistry. Shell coatings altered NW optical properties, suppressing Auger recombination, which is key for future NW applications.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Semiconductor Physics

Background:

  • Low-dimensional heteroassemblies are crucial for advanced electronic and optical devices.
  • Solution-phase chemistry offers a versatile route for synthesizing complex nanostructures.
  • Understanding core-shell interactions in nanowires (NWs) is vital for property tuning.

Purpose of the Study:

  • To demonstrate the solution-phase synthesis of various core/shell nanowire (NW) heterostructures (CdS/CdSe, CdSe/CdS, CdSe/ZnTe).
  • To investigate the growth mechanisms and structural characteristics of these core/shell NWs.
  • To explore the electronic and optical property modifications induced by shell coatings, particularly Auger kinetics.

Main Methods:

  • Solution-phase synthesis of core/shell NWs at moderate temperatures (215-250°C).
  • Characterization using transmission electron microscopy (TEM), selected area electron diffraction (SAED), and energy dispersive X-ray analysis (EDX).
  • Optical studies including UV-vis extinction, photoluminescence (PL), and transient differential absorption spectroscopy (TDAS).

Main Results:

  • Successfully synthesized CdS/CdSe, CdSe/CdS, and CdSe/ZnTe core/shell NWs, forming type-I and type-II heterostructures.
  • Observed Stranski-Krastanov or Volmer-Weber growth initially, followed by polycrystalline shell formation beyond a critical thickness.
  • TDAS revealed suppression of three-carrier Auger kinetics in CdS/CdSe and CdSe/CdS NWs, indicating shell-induced electronic modifications.

Conclusions:

  • Solution-phase chemistry enables the creation of tunable core/shell NW heterostructures.
  • Shell coatings significantly influence the optical properties of NWs, specifically impacting carrier dynamics like Auger recombination.
  • These findings highlight the potential of core/shell NWs for advanced optical applications and fundamental studies.