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Related Concept Videos

Semiconductors01:22

Semiconductors

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There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
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Binary fission is the primary mode of asexual reproduction in prokaryotes, such as bacteria. It results in the production of two genetically identical daughter cells. This highly efficient process ensures the rapid propagation of bacterial populations under favorable conditions and involves coordinated cellular and molecular events.DNA Replication and SeparationThe process begins with the replication of the bacterial chromosome. The circular DNA molecule unwinds at a specific origin of...
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Fission is the division of a single entity into two or more parts, which regenerate into separate entities that resemble the original. Organisms in the Archaea and Bacteria domains reproduce using binary fission, in which a parent cell splits into two parts that can each grow to the size of the original parent cell. This asexual method of reproduction produces cells that are all genetically identical.
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Types of Semiconductors01:20

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Intrinsic semiconductors are highly pure materials with no impurities. At absolute zero, these semiconductors behave as perfect insulators because all the valence electrons are bound, and the conduction band is empty, disallowing electrical conduction. The Fermi level is a concept used to describe the probability of occupancy of energy levels by electrons at thermal equilibrium. In intrinsic semiconductors, the Fermi level is positioned at the midpoint of the energy gap at absolute zero. When...
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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.
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2D Binary Plasmonic Nanoassemblies with Semiconductor n/p-Doping-Like Properties.

Qianqian Shi1,2, Debabrata Sikdar3,4,5, Runfang Fu1,2

  • 1Department of Chemical Engineering, Faculty of Engineering, Monash University, Clayton, 3800, Victoria, Australia.

Advanced Materials (Deerfield Beach, Fla.)
|May 16, 2018
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Summary
This summary is machine-generated.

Researchers extended semiconductor doping concepts to plasmonic nanomaterials, observing n/p-doping-like properties in gold-silver nanocubes. This "plasmonic doping" offers a new design principle for tunable optoelectronic devices.

Keywords:
2Dassembliesbinarydopingplasmonic

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Condensed Matter Physics

Background:

  • Semiconductor properties are tunable via dopant concentration.
  • Plasmonic nanomaterials offer unique optical properties.

Purpose of the Study:

  • To investigate the extension of semiconductor doping concepts to plasmonic nanomaterials.
  • To explore tunable properties of two-dimensional (2D) assemblies of gold-silver (Au@Ag) and gold (Au) nanocubes (NCs).

Main Methods:

  • Experimental and theoretical studies on 2D assemblies of Au@Ag and Au NCs.
  • Analysis of collective semiconductor n/p-doping-like plasmonic properties.
  • Selective removal of silver (Ag) from Au@Ag NCs to create "void" dopants.

Main Results:

  • Observed collective semiconductor n/p-doping-like plasmonic properties in Au@Ag and Au NC assemblies.
  • Identified a threshold doping concentration in Au@Ag NCs, with p-doping dominating below and n-doping above.
  • Demonstrated conversion of Ag dopants to "void" dopants without structural compromise.

Conclusions:

  • The "plasmonic doping" concept is a viable extension of semiconductor doping principles.
  • This concept provides a general design strategy for synthesizing plasmonic metamaterials.
  • Enables the development of plasmonic metamaterials for programmable optoelectronic devices.