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Related Concept Videos

Colloids03:22

Colloids

20.9K
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...
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Quantum Numbers02:43

Quantum Numbers

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It is said that the energy of an electron in an atom is quantized; that is, it can be equal only to certain specific values and can jump from one energy level to another but not transition smoothly or stay between these levels.
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The Quantum-Mechanical Model of an Atom02:45

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Shortly after de Broglie published his ideas that the electron in a hydrogen atom could be better thought of as being a circular standing wave instead of a particle moving in quantized circular orbits, Erwin Schrödinger extended de Broglie’s work by deriving what is now known as the Schrödinger equation. When Schrödinger applied his equation to hydrogen-like atoms, he was able to reproduce Bohr’s expression for the energy and, thus, the Rydberg formula governing hydrogen spectra.
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Colloids and Suspensions01:17

Colloids and Suspensions

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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...
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Colloidal precipitates01:09

Colloidal precipitates

5.9K
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...
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Dot Product01:29

Dot Product

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The dot product is an essential concept in mathematics and physics.
In engineering, the dot product of any two vectors is the product of the magnitudes of the vectors and the cosine of the angle between them. It is denoted by a dot symbol between the two vectors.
Consider a vehicle pulling an object along the ground using a rope. If the rope makes an angle with the horizontal axis, the work done can be calculated using the dot product of the force applied and the object's displacement.
The dot...
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Production and Targeting of Monovalent Quantum Dots
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Nanostructured Back Reflectors for Efficient Colloidal Quantum-Dot Infrared Optoelectronics.

Se-Woong Baek1, Pau Molet2, Min-Jae Choi1

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

Advanced Materials (Deerfield Beach, Fla.)
|June 22, 2019
PubMed
Summary
This summary is machine-generated.

Colloidal quantum dots (CQDs) solar cells can now capture more infrared light using nanostructured back electrodes. This innovation enhances solar power conversion efficiency by improving light trapping in thin CQD layers.

Keywords:
colloidal quantum dotsconjugated polymershole transporting layersinfrared optoelectronicsnanoimprinting

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Photovoltaics

Background:

  • Colloidal quantum dots (CQDs) extend solar cell response to infrared (IR) light, beyond the capabilities of silicon and perovskites.
  • Achieving complete IR photon absorption in CQD solids necessitates micrometer-scale thicknesses, which exceed typical photoexcited charge diffusion lengths (≈300 nm).
  • This limitation hinders efficient IR light utilization in thin-film CQD solar cells.

Purpose of the Study:

  • To develop nanostructured metal back electrodes for efficient IR light trapping in thin CQD solar cell active layers.
  • To create a novel, moldable hole-transport layer (HTL) suitable for nanoimprint lithography and effective charge extraction.
  • To enhance the photoelectric conversion efficiency of CQD solar cells, particularly in the infrared spectrum.

Main Methods:

  • Development of a moldable HTL material with suitable mechanical, chemical, and optoelectronic properties for CQD devices.
  • Direct nanostructuring of the HTL into a 2D lattice using nanoimprint lithography.
  • Conformal coating of the nanostructured HTL with Molybdenum trioxide (MoO3) and Silver (Ag) to form the back electrode photonic structure.

Main Results:

  • Demonstration of nanostructured metal back electrodes enabling efficient IR light trapping in thin CQD layers without compromising electrical properties.
  • The new HTL successfully facilitates efficient charge extraction through an optically thick layer.
  • A record photoelectric conversion efficiency of 86% was achieved for light beyond the silicon bandgap, with a 22% increase in IR power conversion efficiency compared to previous reports.

Conclusions:

  • Nanostructured metal back electrodes, utilizing a novel, directly nanostructured HTL, significantly improve IR light absorption and charge extraction in CQD solar cells.
  • This approach overcomes the limitations imposed by short charge diffusion lengths in thin CQD films.
  • The developed technology offers a pathway to substantially enhance solar power conversion efficiency, particularly for infrared spectrum utilization.