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Related Concept Videos

Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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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...
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Lattice Centering and Coordination Number02:33

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The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
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Carrier Transport01:21

Carrier Transport

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The generation of electrical current in semiconductors is fundamentally driven by two mechanisms: drift and diffusion. These processes are essential for the functionality and performance of semiconductor-based devices.
Drift Current:
The drift of charge carriers is started by an external electric field (E). Charged particles, such as electrons and holes, experience an acceleration between collisions with lattice atoms. For electrons, this results in a drift velocity (vd) given by:
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Energy Bands in Solids01:01

Energy Bands in Solids

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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...
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Stereoisomerism of Cyclic Compounds02:33

Stereoisomerism of Cyclic Compounds

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In this lesson, we delve into the role of ring conformation and its stability, which determines the spatial arrangement and, consequently, the molecular symmetry and stereoisomerism of cyclic compounds. 1,2-Dimethylcyclohexane is used as a case study to evaluate the possible number of stereoisomers. Here, given the multiple (n = 2) chiral centers, there are 2n = 4 possible configurations that lack a plane of symmetry, as the ring skeleton exists in a non-planar chair conformation. In addition,...
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2D NMR: Homonuclear Correlation Spectroscopy (COSY)01:06

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Homonuclear correlation spectroscopy, or COSY, is a 2-dimensional NMR technique that provides information about coupled protons. Typically, the geminal and vicinal coupling are observed. For example, consider the COSY spectrum of ethyl acetate, where its 1D proton NMR spectrum is plotted along the vertical and horizontal axes with their corresponding chemical shift scale. Three spots on the diagonal corresponding to the three peaks in the 1D proton spectrum are called diagonal peaks. The COSY...
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Related Experiment Video

Updated: Oct 3, 2025

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Carrier localization in zero-dimensional and one-dimensional CdSe-CdS heterostructures.

Yannic U Staechelin1, Michael Deffner2, Sonja Krohn3

  • 1Institut für Physikalische Chemie, Universität Hamburg, Hamburg, Germany.

The Journal of Chemical Physics
|February 16, 2022
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Summary

Mobile charge carriers in nanostructures are key for energy applications. Shell-located electrons in quantum rods enable photoconductivity, while core carriers form immobile excitons.

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Area of Science:

  • Nanotechnology
  • Materials Science
  • Physical Chemistry

Background:

  • Mobile charge carriers in heterostructured nanoparticles are crucial for applications demanding efficient charge separation and extraction.
  • Understanding carrier dynamics in these systems is essential for optimizing device performance.

Purpose of the Study:

  • To investigate the behavior of mobile charge carriers in benchmark heterostructured nanoparticles, specifically CdSe-CdS core-shell quantum dots and quantum dots in quantum rods.
  • To correlate photoconductivity with carrier location within these nanostructures.

Main Methods:

  • Utilized optical and terahertz (THz) pump-probe spectroscopy to study carrier dynamics.
  • Investigated charge carrier location and its influence on photoconductivity.

Main Results:

  • Observed that only electrons located in the shell of quantum rods contribute to measurable photoconductivity.
  • Demonstrated that in quasi-type II heterostructures, core-located carriers form immobile excitons.
  • Showcased that these immobile excitons respond to external electrical fields through polarization.

Conclusions:

  • The location of charge carriers within heterostructured nanoparticles dictates their contribution to photoconductivity.
  • Shell-located electrons are essential for charge transport in quantum rods.
  • Immobile excitons in core locations can be polarized by electric fields, offering potential for other applications.