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Related Concept Videos

Semiconductors01:22

Semiconductors

1.5K
There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
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Types of Semiconductors01:20

Types of Semiconductors

1.4K
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...
1.4K
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

1.0K
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...
1.0K
Biasing of Metal-Semiconductor Junctions01:27

Biasing of Metal-Semiconductor Junctions

586
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...
586
Band Theory02:35

Band Theory

17.2K
When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
17.2K
The Periodic Table03:25

The Periodic Table

115.2K
As early chemists discovered more elements, they realized that various elements could be grouped by their similar chemical behaviors. One such grouping includes lithium (Li), sodium (Na), and potassium (K). All of these elements are shiny, conduct heat and electricity well, and have similar chemical properties. A second grouping includes calcium (Ca), strontium (Sr), and barium (Ba), which also are shiny, good conductors of heat and electricity, and have chemical properties in common. However,...
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Facile Synthesis of Colloidal Lead Halide Perovskite Nanoplatelets via Ligand-Assisted Reprecipitation
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Semiconductor Nanoplatelet Excimers.

Benjamin T Diroll1, Wooje Cho2, Igor Coropceanu2

  • 1Center for Nanoscale Materials , Argonne National Laboratory , Lemont , Illinois 60439 , United States.

Nano Letters
|September 25, 2018
PubMed
Summary
This summary is machine-generated.

Excimers, or excited dimers, are observed for the first time in semiconductor nanoplatelets. This discovery in cadmium selenide (CdSe) nanoplatelets opens new avenues for advanced laser gain media.

Keywords:
Excimeramplified spontaneous emissionnanoplateletphotoluminescencetwo-dimensional

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photophysics

Background:

  • Excimers (excited dimers) are crucial for laser gain media, typically found in molecular fluorophores.
  • Atomically precise semiconductor nanoplatelets offer novel material properties.

Purpose of the Study:

  • To investigate the formation and characteristics of excimers in atomically precise two-dimensional semiconductor nanoplatelets.
  • To explore the potential of these excimers as gain media for lasers.

Main Methods:

  • Low-temperature photoluminescence spectroscopy of colloidal cadmium selenide (CdSe) nanoplatelets.
  • Analysis of fluorescence bands and their dependence on nanoplatelet concentration and stacking.

Main Results:

  • Two-color photoluminescence observed in CdSe nanoplatelets, with one band attributed to excimer fluorescence.
  • Excimer emission intensity correlates positively with nanoplatelet concentration and cofacial stacking.
  • Amplified spontaneous emission observed from the excimer emission line, indicating gain medium potential.

Conclusions:

  • Evidence confirms excimer formation in semiconductor nanoplatelets, a novel material class.
  • CdSe nanoplatelet excimers exhibit characteristics suitable for low-threshold laser gain media.
  • This finding expands the scope of excimer applications into nanomaterials.