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Related Experiment Video

Updated: Jul 13, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

Ligand-Mediated Shape Engineering of SWIR InAs Colloidal Quantum Dots for Photodetector Applications.

Taewan Kim1, Jae Taek Oh1, Hao Wu1

  • 1ICFO-Insitut De Ciències Fotòniques, The Barcelona Institute of Science and Technology, Castelldefels, Barcelona, Spain.

Advanced Materials (Deerfield Beach, Fla.)
|July 11, 2026
PubMed
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Researchers developed new indium arsenide colloidal quantum dots (InAs CQDs) for short-wave infrared optoelectronics. Bulky oleic acid ligands enabled shape control, achieving longer wavelengths and improved photodetector performance.

Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Indium arsenide colloidal quantum dots (InAs CQDs) are key for short-wave infrared (SWIR) optoelectronics.
  • Current synthesis methods using amino-arsine precursors struggle to achieve wavelengths beyond 1300 nm due to growth stagnation and surface control issues.

Purpose of the Study:

  • To develop a robust strategy for synthesizing high-quality SWIR InAs CQDs with extended wavelength capabilities.
  • To overcome kinetic barriers and achieve precise morphological control for bandgap tunability.

Main Methods:

  • Introducing bulky oleic acid (OA) ligands during InAs CQD synthesis.
  • Modulating the steric hindrance of OA ligands and (111) facet stabilization to control nanocrystal shape evolution.
  • Utilizing OA-mediated surface chemistry for conductive ink formulation.
Keywords:
InAs quantum dotsSWIR‐photodetectorshape‐controlled nanocrystal growthsolution‐phase ligand‐exchange

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Related Experiment Videos

Last Updated: Jul 13, 2026

Compact Quantum Dots for Single-molecule Imaging
17:14

Compact Quantum Dots for Single-molecule Imaging

Published on: October 9, 2012

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

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes
09:28

Engineering Molecular Recognition with Bio-mimetic Polymers on Single Walled Carbon Nanotubes

Published on: January 10, 2017

Main Results:

  • Achieved a morphological transition from spheres to tetrahedrons, reducing nanocrystal volume while maintaining absorption wavelength.
  • Enabled bandgap tunability for InAs CQDs, accessing SWIR region (>1700 nm) under mild conditions (260-280°C).
  • Developed photodetectors using amino-arsine-synthesized InAs CQDs with spectral coverage up to 1.6 µm, showing 19.1% EQE at 1300 nm and D* of 3.4 × 10^10 Jones.

Conclusions:

  • The OA ligand strategy effectively overcomes synthesis limitations for InAs CQDs.
  • This approach provides a novel pathway for tuning InAs CQD bandgaps for advanced SWIR optoelectronic applications.
  • The developed photodetectors demonstrate promising performance for SWIR detection.