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Related Concept Videos

Colloids03:22

Colloids

21.2K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
21.2K
Electron Carriers01:24

Electron Carriers

92.0K
Electron carriers can be thought of as electron shuttles. These compounds can easily accept electrons (i.e., be reduced) or lose them (i.e., be oxidized). They play an essential role in energy production because cellular respiration is contingent on the flow of electrons.
Over the many stages of cellular respiration, glucose breaks down into carbon dioxide and water. Electron carriers pick up electrons lost by glucose in these reactions, temporarily storing and releasing them into the electron...
92.0K
Colloids and Suspensions01:17

Colloids and Suspensions

3.5K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
3.5K
Colloidal precipitates01:09

Colloidal precipitates

6.5K
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...
6.5K
Carrier Transport01:21

Carrier Transport

972
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:
972
The ADP/ATP Carrier Protein01:42

The ADP/ATP Carrier Protein

4.3K
ADP/ATP carrier or AAC protein is the most abundant carrier protein in the inner mitochondrial membrane. It transports large quantities of ADP and ATP, equivalent to the average human body weight, every day. Among other transporters, ACC protein is one of the best-studied members of the mitochondrial carrier protein family. The ADP/ATP carrier protein comprises two transmembrane helices connected to a loop and a single alpha-helix on the matrix side. It switches between two conformational...
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Related Experiment Video

Updated: Feb 9, 2026

Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation
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Photodeposition of Pd onto Colloidal Au Nanorods by Surface Plasmon Excitation

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Efficient Carrier Multiplication in Colloidal Silicon Nanorods.

Carl Jackson Stolle1, Xiaotang Lu1, Yixuan Yu1

  • 1McKetta Department of Chemical Engineering, Texas Materials Institute, Center for Nano- and Molecular Science and Technology, The University of Texas at Austin , Austin, Texas 78712, United States.

Nano Letters
|August 2, 2017
PubMed
Summary

Silicon nanorods show enhanced carrier multiplication (CM) compared to nanocrystals. Longer nanorods increase Auger lifetimes, but optimal CM quantum yield occurs at a critical length, exceeding that of spherical silicon nanocrystals.

Keywords:
Auger recombinationCarrier multiplicationmultiple exciton generationnanorodsquantum confinementsilicon nanocrystals

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photophysics

Background:

  • Silicon nanostructures are promising for optoelectronic applications.
  • Understanding carrier multiplication (CM) is crucial for efficient light harvesting.

Purpose of the Study:

  • To investigate the impact of nanorod aspect ratio on CM properties.
  • To compare CM efficiency in silicon nanorods versus nanocrystals.

Main Methods:

  • Transient absorption spectroscopy (TAS) was used to measure lifetimes and quantum yields.
  • Silicon nanorods and nanocrystals were synthesized and passivated with organic ligands.

Main Results:

  • Auger lifetimes increased with nanorod length.
  • Silicon nanorods exhibited higher CM quantum yields than nanocrystals.
  • Optimal CM quantum yield was observed for nanorods with an aspect ratio of 19.3.

Conclusions:

  • Nanorod aspect ratio significantly influences carrier multiplication efficiency.
  • Silicon nanorods offer advantages over nanocrystals for enhanced multiexciton generation.