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Related Concept Videos

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...
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,...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

Engineering band structure in nanoscale quantum-dot supercrystals.

Anvar S Baimuratov1, Ivan D Rukhlenko, Anatoly V Fedorov

  • 1Saint Petersburg National Research University of Information Technologies, Mechanics and Optics, Saint Petersburg 197101, Russia.

Optics Letters
|July 2, 2013
PubMed
Summary

Supercrystals of semiconductor quantum dots offer tunable optical properties for nanophotonics. Researchers can engineer exciton energy bands by altering quantum dot arrangement for advanced nanoscale devices.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Semiconductor quantum dots (QDs) arranged in supercrystals show potential for nanophotonics.
  • Their optical responses can be finely tuned by manipulating QD arrangement.

Purpose of the Study:

  • To demonstrate engineering opportunities in two-dimensional quantum-dot supercrystals.
  • To explore tailoring exciton energy bands through QD arrangement.
  • To achieve unprecedented control over supercrystal optical properties.

Main Methods:

  • Fabrication of two-dimensional quantum-dot supercrystals.
  • Systematic alteration of quantum dot arrangement within supercrystals.
  • Characterization of resulting exciton energy bands and optical properties.

Main Results:

  • Demonstrated broad engineering opportunities by tailoring exciton energy bands.
  • Achieved precise control over the optical properties of quantum-dot supercrystals.
  • Established a versatile material base for advanced nanoscale photonics devices.

Conclusions:

  • Quantum dot arrangement in supercrystals provides significant control over optical properties.
  • This approach enables the development of novel nanoscale photonics devices.
  • Tailoring exciton energy bands is key to advancing supercrystal-based nanophotonics.