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Related Concept Videos

Semiconductors01:22

Semiconductors

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...
Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...
Types of Semiconductors01:20

Types of Semiconductors

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...
Band Theory02:35

Band Theory

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,...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Fermi Level01:18

Fermi Level

The Fermi-Dirac function is represented by an S-shaped curve indicating the probability of an energy state being occupied by an electron at a given temperature. The Fermi level is the energy level at which there is a fifty percent chance of finding an electron, and it is positioned between the lower-energy valence band and the higher-energy conduction band.
At absolute zero temperature, electrons fill all energy states up to the Fermi level, leaving upper states empty. As the temperature rises,...

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Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids
13:29

Harvesting Solar Energy by Means of Charge-Separating Nanocrystals and Their Solids

Published on: August 23, 2012

Semiconductor nanocrystals: structure, properties, and band gap engineering.

Andrew M Smith1, Shuming Nie

  • 1Department of Biomedical Engineering, Emory University and Georgia Institute of Technology, 101 Woodruff Circle, Suite 2001, Atlanta, Georgia 30322, USA.

Accounts of Chemical Research
|October 16, 2009
PubMed
Summary
This summary is machine-generated.

Semiconductor nanocrystals, tiny light-emitting particles, offer tunable optical properties for diverse applications. Their quantum confinement effect allows precise control over light emission across various spectral ranges.

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13:29

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Electric-field Control of Electronic States in WS2 Nanodevices by Electrolyte Gating
10:36

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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures
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Ohmic Contact Fabrication Using a Focused-ion Beam Technique and Electrical Characterization for Layer Semiconductor Nanostructures

Published on: December 5, 2015

Area of Science:

  • Materials Science
  • Nanotechnology
  • Quantum Physics

Background:

  • Semiconductor nanocrystals are nanoscale light-emitting particles with significant applications.
  • Their unique properties stem from the quantum confinement effect, enclosing charge carriers within the crystal.

Purpose of the Study:

  • To review recent advancements in understanding semiconductor nanocrystal atomic structure and optical properties.
  • To discuss strategies for engineering band gaps and electronic wave functions for charge carrier control.

Main Methods:

  • Tuning particle size and shape to control electronic energy states and optical transitions.
  • Engineering band gaps and electronic wave functions.
  • Utilizing methodologies like alloying, doping, strain-tuning, and band-edge warping.

Main Results:

  • Precise tuning of light emission across UV, visible, and infrared spectra.
  • Observation of novel optical properties, including carrier multiplication and single-particle blinking.
  • Development of complex nanostructures for imaging and therapy.

Conclusions:

  • Semiconductor nanocrystals are versatile building blocks with tunable optical properties.
  • Advanced engineering strategies are crucial for future optoelectronic and biomedical applications.