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Valence Bond Theory02:42

Valence Bond Theory

Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

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 semiconductor's...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
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...

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Related Experiment Video

Updated: Jun 2, 2026

Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
12:21

Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence

Published on: March 6, 2020

Surface-state-mediated charge-transfer dynamics in CdTe/CdSe core-shell quantum dots.

Sachin Rawalekar1, Sreejith Kaniyankandy, Sandeep Verma

  • 1Radiation and Photochemistry Division, Bhabha Atomic Research Centre, Mumbai, India.

Chemphyschem : a European Journal of Chemical Physics and Physical Chemistry
|May 14, 2011
PubMed
Summary
This summary is machine-generated.

We synthesized aqueous cadmium telluride/cadmium selenide (CdTe/CdSe) type-II core-shell quantum dots (QDs) using 3-mercaptopropionic acid. These QDs show enhanced emission lifetime and efficient charge separation, with shell thickness influencing optical properties.

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Close-Space Sublimation-Deposited Ultra-Thin CdSeTe/CdTe Solar Cells for Enhanced Short-Circuit Current Density and Photoluminescence
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11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Quantum dots (QDs) are semiconductor nanocrystals with size-dependent optical and electronic properties.
  • Type-II core-shell QDs offer unique charge separation characteristics beneficial for optoelectronic applications.
  • Controlling shell thickness is crucial for tuning QD performance.

Purpose of the Study:

  • To synthesize and characterize aqueous CdTe/CdSe type-II core-shell quantum dots.
  • To investigate the effect of CdSe shell thickness on the optical and electronic properties of CdTe QDs.
  • To understand charge carrier dynamics and the role of traps in these core-shell structures.

Main Methods:

  • Synthesis of CdTe and CdTe/CdSe core-shell QDs using 3-mercaptopropionic acid.
  • Characterization using X-ray diffraction (XRD) and high-resolution transmission electron microscopy (HR-TEM).
  • Optical property analysis via steady-state absorption, emission spectroscopy, time-resolved emission, and transient absorption studies.

Main Results:

  • A red shift in absorption and emission spectra was observed with increasing CdSe shell thickness.
  • XRD indicated peak shifts, and HR-TEM confirmed spherical morphology with a ~2 nm size increase post-shell formation.
  • Average emission lifetime increased from 12 ns for CdTe QDs to 23.5 ns for CdTe/CdSe QDs, indicating efficient charge separation.
  • Transient absorption and carrier quenching studies revealed the significant impact of traps on carrier cooling dynamics.

Conclusions:

  • The synthesis of aqueous CdTe/CdSe type-II core-shell QDs was successfully achieved.
  • Increasing CdSe shell thickness enhances emission lifetime and promotes efficient charge separation.
  • Carrier dynamics are influenced by trap states, particularly hole traps, in these core-shell nanostructures.