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Preparation and Reactions of Sulfides

Preparation and Reactions of Sulfides

Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.

Sulfur Assimilation

Sulfur Assimilation

Sulfur is an essential element in biological systems, contributing to synthesizing key biomolecules, including amino acids such as cysteine and methionine, and cofactors such as coenzyme A and biotin. Microorganisms primarily assimilate sulfur as sulfate (SO₄²⁻) from the environment, which must undergo a series of biochemical transformations before it can be incorporated into cellular components. As sulfate is highly oxidized, it must undergo assimilatory sulfate reduction to...

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Related Experiment Video

Updated: May 1, 2026

Enhanced Electron Injection and Exciton Confinement for Pure Blue Quantum-Dot Light-Emitting Diodes by Introducing Partially Oxidized Aluminum Cathode

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High-performance quantum-dot solids via elemental sulfur synthesis.

Mingjian Yuan¹, Kyle W Kemp, Susanna M Thon

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

Advanced Materials (Deerfield Beach, Fla.)

|March 25, 2014

Summary

Researchers developed a low-cost synthesis for lead sulfide colloidal quantum dot (PbS-CQD) solar cells. This method significantly boosts power conversion efficiency, achieving a record 5.4% for 1 eV bandgap devices.

Keywords:

PbS colloidal quantum dots depleted heterojunctions photovoltaics synthesis

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Area of Science:

Materials Science
Nanotechnology
Renewable Energy

Background:

Colloidal quantum dots (CQDs) offer tunable bandgaps for photovoltaic applications.
Lead sulfide (PbS) CQDs are promising due to their small bandgap, suitable for infrared light absorption.
Improving the efficiency and stability of PbS-CQD solar cells is crucial for commercial viability.

Purpose of the Study:

To develop a cost-effective and high-quality synthesis platform for small-bandgap PbS-CQD devices.
To enhance the power conversion efficiency (PCE) of 1 eV bandgap PbS-CQD photovoltaic devices.
To establish a new record PCE for 1 eV PbS CQD solar cells.

Main Methods:

Elemental sulfur-based synthesis of PbS CQDs.
Size-selective precipitation for improved size dispersion.
Cadmium chloride passivation for defect reduction and enhanced performance.

Main Results:

Achieved a low-cost, high-quality synthesis platform for PbS-CQD devices.
Demonstrated significant improvements in PCE for 1 eV bandgap CQD photovoltaic devices.
Attained a record power conversion efficiency of 5.4% for a 1 eV PbS CQD solar cell.

Conclusions:

The elemental sulfur-based synthesis, coupled with size-selective precipitation and CdCl2 passivation, provides an effective route to high-performance PbS-CQD solar cells.
This approach offers a scalable and economical pathway for developing advanced CQD-based photovoltaic technologies.
The record PCE highlights the potential of PbS CQDs as a viable material for efficient solar energy conversion.