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Related Experiment Video

Updated: Jul 30, 2025

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

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Sequential Co-Passivation in InAs Colloidal Quantum Dot Solids Enables Efficient Near-Infrared Photodetectors.

Pan Xia1, Bin Sun2, Margherita Biondi1

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

Advanced Materials (Deerfield Beach, Fla.)
|May 12, 2023
PubMed
Summary

Researchers developed a new co-passivation strategy for indium arsenide colloidal quantum dots (CQDs), significantly improving photodetector efficiency. This method enhances passivation and maintains charge carrier mobility, leading to record performance.

Keywords:
III-V compound semiconductorsindium arsenidenear-infrared photodetectors

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • III-V colloidal quantum dots (CQDs) offer heavy-metal-free optoelectronic solutions with broad absorption spectra.
  • Existing passivation strategies using single ligands are insufficient for fabricating efficient conductive CQD solids due to the covalent nature of III-V CQDs.

Purpose of the Study:

  • To develop an effective passivation strategy for III-V CQDs to enhance optoelectronic device performance.
  • To fabricate efficient indium arsenide (InAs) CQD-based photodetectors.

Main Methods:

  • Density functional theory (DFT) simulations guided the development of a novel co-passivation strategy.
  • A combination of X-type methyl ammonium acetate (MaAc) and Z-type InBr3 ligands was employed for co-passivation.
  • Fabrication and characterization of InAs CQD photodetectors using the developed co-passivation technique.

Main Results:

  • The co-passivation strategy significantly improved CQD passivation, evidenced by a 25% decrease in Stokes shift and a fourfold reduction in exciton absorption linewidth broadening.
  • Charge carrier mobility was maintained, and photoluminescence (PL) lifetime doubled.
  • The fabricated InAs CQD photodetectors achieved a record 37% external quantum efficiency (EQE) at 950 nm.

Conclusions:

  • The developed co-passivation strategy using MaAc and InBr3 ligands is highly effective for III-V CQDs.
  • This approach overcomes limitations of single-ligand exchanges and enables high-performance optoelectronic devices.
  • The findings pave the way for advanced InAs CQD photodetectors and other optoelectronic applications.