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Related Concept Videos

Colloids03:22

Colloids

21.1K
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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Band Theory02:35

Band Theory

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When two or more atoms come together to form a molecule, their atomic orbitals combine and molecular orbitals of distinct energies result. In a solid, there are a large number of atoms, and therefore a large number of atomic orbitals that may be combined into molecular orbitals. These groups of molecular orbitals are so closely placed together to form continuous regions of energies, known as the bands.
The energy difference between these bands is known as the band gap.
Conductor, Semiconductor,...
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The Quantum-Mechanical Model of an Atom02:45

The Quantum-Mechanical Model of an Atom

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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

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...
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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...
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Updated: Feb 5, 2026

Production and Targeting of Monovalent Quantum Dots
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Production and Targeting of Monovalent Quantum Dots

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Dual-Band Infrared PbS Colloidal Quantum Dot Focal Plane Array.

Yunxiang Di1,2, Kun Ba3,4,5, Lingfeng Ye6

  • 1College of Integrated Circuits & Micro-Nano Electronics, Fudan University, Shanghai, China.

Nature Communications
|February 3, 2026
PubMed
Summary
This summary is machine-generated.

A new top-illuminated photodetector uses lead sulfide colloidal quantum dots for dual-band infrared detection. This scalable technology enables high-performance, low-cost infrared imagers for various applications.

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Area of Science:

  • Optoelectronics
  • Materials Science
  • Infrared Technology

Background:

  • Dual-band detection is crucial for material identification, biological diagnostics, and machine vision.
  • Existing dual-band photodetectors face challenges in large-area manufacturing and integration with standard circuits.

Purpose of the Study:

  • To develop a novel top-illuminated p-i-n-i-p dual-band photodetector.
  • To enable bias-switchable spectral response in near-infrared and short-wave infrared regimes.

Main Methods:

  • Utilized solution-processed lead sulfide (PbS) colloidal quantum dots of two distinct sizes.
  • Fabricated a top-illuminated p-i-n-i-p device architecture.
  • Demonstrated a monolithic 128x128 dual-band focal plane array.

Main Results:

  • Achieved specific detectivity > 1x10^11 cm·Hz^1/2·W^-1 in both bands.
  • Reported low crosstalk: 0.5% for short-wave infrared and 7.7% for near-infrared.
  • Successfully demonstrated a functional dual-band infrared imager.

Conclusions:

  • Established a scalable, silicon-compatible platform for high-performance, low-cost dual-band infrared imagers.
  • The developed photodetector technology offers significant advantages over current architectures.