Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Imperfections in Crystal Structure: Stoichiometric Point Defects01:26

Imperfections in Crystal Structure: Stoichiometric Point Defects

101
Schottky defects arise when some lattice points in a crystal, such as those in NaCl, remain unoccupied, creating lattice vacancies without disturbing the overall electrical neutrality of the crystal. This defect is common in ionic crystals where the positive and negative ions are similar in size, as seen in sodium chloride and cesium chloride. The presence of Schottky defects enables the crystal to conduct electricity to a small extent through an ionic mechanism. Electric fields cause nearby...
101
Imperfections in Crystal Structure: Non-Stoichiometric Defects01:29

Imperfections in Crystal Structure: Non-Stoichiometric Defects

101
Non-stoichiometric defects refer to a type of defect in the crystal structure of a compound where the ratio of its constituent elements deviates from the ideal stoichiometric ratio. There are two main types of non-stoichiometric defects: metal excess defects and metal deficiency defects.Metal excess defects occur when there is a slight surplus of metal ions than what is required by the stoichiometric ratio of the compound. For example, heating a sodium chloride crystal in sodium vapor results...
101
Colloidal precipitates01:09

Colloidal precipitates

7.0K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
7.0K
The Colloidal State01:29

The Colloidal State

167
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
167
Types of Semiconductors01:20

Types of Semiconductors

1.9K
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...
1.9K
Imperfections in Crystal Structure: Point, Line and Plane Defects01:25

Imperfections in Crystal Structure: Point, Line and Plane Defects

130
A perfect crystal, in theory, has a uniform structure with the same unit cell and lattice points throughout. However, any deviation from this periodic arrangement is known as an imperfection or defect. These defects can be categorized into three types: point, line, and plane defects.Point defects occur when there is a deviation from the ideal due to missing atoms, displaced atoms, or additional atoms. These imperfections might occur due to imperfect packing during crystallization or because of...
130

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

A High-Purity Ethylene Epoxide Stream Produced Using a Supported Electrocatalyst.

Journal of the American Chemical Society·2026
Same author

Crystalline Dion-Jacobson 2D Layered Sn-Based Perovskites for Field-Effect Transistors.

Journal of the American Chemical Society·2026
Same author

Triple-junction solar cells with improved carrier and photon management.

Nature·2026
Same author

Ligand-Driven Tuning of Adsorption Energy in Nanocrystals for High-Performance H<sub>2</sub>O<sub>2</sub> Electrosynthesis.

Journal of the American Chemical Society·2026
Same author

Electrified release of pure CO<sub>2</sub> from postcapture liquid: A two-stage system lowers the total energy cost.

Proceedings of the National Academy of Sciences of the United States of America·2026
Same author

Small alkali cations direct CO electroreduction to hydrocarbons rather than oxygenates.

Nature chemistry·2026
Same journal

Engineered Young Brown Adipose Tissue-Derived Exosomes Alleviate Radiation-Induced Lung Injury by Promoting G Protein-Coupled Receptor 183 Ubiquitination.

ACS nano·2026
Same journal

Pore Geometry-Driven Capture of Trace Aromatic Volatile Organic Compounds in Al-Based MOFs.

ACS nano·2026
Same journal

Dual-Bridged Porphyrin-Based Covalent Organic Framework with Integrated Specific Fluorescent Recognition and Cooperative Adsorption Capabilities.

ACS nano·2026
Same journal

Split-Gate Memtransistors for Energy-Efficient Adaptive Reinforcement Learning.

ACS nano·2026
Same journal

Interface Coordination Nucleation of Copper Nanoclusters on Covalent Organic Frameworks for Electrocatalytic Ammonia Synthesis.

ACS nano·2026
Same journal

High-Performance Near-Infrared Quantum Emission from Color Centers in hBN.

ACS nano·2026
See all related articles

Related Experiment Video

Updated: Apr 21, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

8.1K

Electronically active impurities in colloidal quantum dot solids.

Graham H Carey1, Illan J Kramer, Pongsakorn Kanjanaboos

  • 1The Edward S. Rogers Department of Electrical and Computer Engineering, University of Toronto , 10 King's College Road, Toronto, Ontario M5S 3G4, Canada.

ACS Nano
|November 8, 2014
PubMed
Summary
This summary is machine-generated.

Researchers found that an acidic treatment during colloidal quantum dot film processing removes unwanted complexes, improving photovoltaic device performance by reducing resistance and increasing the fill factor.

Keywords:
colloidal quantum dotcomplexelectroluminescenceimpuritiesligandsphotovoltaics

More Related Videos

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

15.6K
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

9.7K

Related Experiment Videos

Last Updated: Apr 21, 2026

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy
10:40

High Resolution Phonon-assisted Quasi-resonance Fluorescence Spectroscopy

Published on: June 28, 2016

8.1K
Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping
14:58

Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

Published on: June 3, 2015

15.6K
Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection
12:57

Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

Published on: October 13, 2017

9.7K

Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Colloidal quantum dot (CQD) films are promising for photodetection, light emission, and photovoltaics due to solution-phase processing and potential cost reductions.
  • Current fabrication involves solid-state ligand exchange, replacing long insulating ligands with short conductive ones to form insoluble semiconducting films.

Purpose of the Study:

  • To investigate unintended side effects of solid-state ligand exchange in CQD film processing.
  • To develop a method to improve CQD film quality and enhance photovoltaic device performance.

Main Methods:

  • Investigated the formation of high molecular weight complexes during solid-state ligand exchange in CQD films.
  • Introduced an acidic treatment during film processing to remove these complexes.
  • Fabricated and characterized photovoltaic devices using treated and untreated CQD films.

Main Results:

  • Identified the formation of a poorly soluble complex containing lead oleate and short conductive ligands, embedded within the CQD active layer.
  • Demonstrated that acidic treatment effectively breaks up and removes these complexes, yielding a higher quality CQD solid.
  • Photovoltaic devices fabricated with the improved CQD solid exhibited reduced series resistance and an enhanced fill factor compared to controls.

Conclusions:

  • Solid-state ligand exchange in CQD film processing can lead to detrimental complex formation.
  • An acidic treatment is an effective strategy to mitigate these issues, improving CQD film quality.
  • The enhanced CQD material significantly boosts the performance of photovoltaic devices.