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Related Concept Videos

Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The...
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Biasing of Metal-Semiconductor Junctions01:27

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Biasing metal-semiconductor junctions involves applying a voltage across the junction. Specifically, the metal is connected to a voltage source, while the semiconductor is grounded. This technique is essential for controlling the direction and magnitude of current flow in electronic devices, including diodes, transistors, and photovoltaic cells.
In Schottky junctions, where the semiconductor is n-type, applying a positive voltage to the metal relative to the semiconductor reduces its Fermi...
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Related Experiment Video

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Creating Sub-50 Nm Nanofluidic Junctions in PDMS Microfluidic Chip via Self-Assembly Process of Colloidal Particles
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Semiconductor-Metal Nanofloret Hybrid Structures by Self-Processing Synthesis.

Ori Hazut1, Sharon Waichman1, Thangavel Subramani1

  • 1Institute of Chemistry and the Center for Nanoscience and Nanotechnology, The Hebrew University of Jerusalem , Edmond J. Safra Campus, Givat Ram, Jerusalem, 91904, Israel.

Journal of the American Chemical Society
|March 15, 2016
PubMed
Summary

We developed a self-processing synthesis for Nanofloret hybrid nanostructures. This method uses semiconductor nanowire asymmetry for localized wet-chemistry steps, creating metallic nanoshell caps on SiGe nanowires for plasmonic applications.

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Area of Science:

  • * Nanotechnology
  • * Materials Science
  • * Surface Chemistry

Background:

  • * Semiconductor nanowires (NWs) exhibit inherent asymmetry useful for controlled synthesis.
  • * Au-catalyzed chemical vapor deposition (CVD) produces asymmetric NWs.
  • * Metal-semiconductor junctions can activate localized chemical reactions.

Purpose of the Study:

  • * To present a novel synthetic strategy for creating hybrid nanostructures.
  • * To utilize NW asymmetry for localized tip-area modifications.
  • * To develop a one-step, self-processing synthesis for Nanofloret structures.

Main Methods:

  • * Employed Au-catalyzed CVD for semiconductor nanowire synthesis.
  • * Utilized wet-chemistry approach for localized etch, deposition, and modification.
  • * Monitored synthesis using ex situ transmission electron microscopy (TEM), in situ scanning transmission electron microscopy (STEM), and inductively coupled plasma mass spectrometry (ICP-MS).

Main Results:

  • * Developed Nanofloret hybrid nanostructures (SiGe NW with metallic nanoshell cap) using coinage metals (Cu, Ag, Au).
  • * Demonstrated a programmable cascade of events for autonomous, one-step synthesis (self-processing synthesis).
  • * Identified key synthesis steps: localized oxide etch, metal deposition, and process termination, with controllable parameters (etchant concentration, alloy composition, reducing agent, metal redox potential, surfactants).

Conclusions:

  • * The self-processing synthesis enables efficient, one-step fabrication of Nanofloret hybrid nanostructures.
  • * These nanostructures exhibit broad plasmonic absorption, suitable for applications like surface-enhanced Raman scattering (SERS).
  • * The method offers precise control over nanostructure morphology and properties through various synthesis parameters.