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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

Colloidal InSb Quantum Dots for eSWIR Photodetection via Decoupling Nucleation and Growth.

Haiyun Ma1,2, Ran An2, Qiyu Cao2

  • 1Materials Innovation Institute For Life Sciences and Energy (MILES), HKU-SIRI, Shenzhen, P. R. China.

Small (Weinheim an Der Bergstrasse, Germany)
|July 11, 2026
PubMed
Summary

Researchers developed a two-step synthesis for large, heavy-metal-free Indium Antimonide (InSb) quantum dots. This enables tunable extended short-wave infrared (eSWIR) optoelectronics with improved performance.

Keywords:
IR photodetectorscolloidal InSb quantum dotsextended short‐wave infrared (eSWIR)group III‐V semiconductorsnucleation and growthsurface ligand exchange

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Optoelectronics

Background:

  • Colloidal Indium Antimonide (InSb) quantum dots (QDs) are promising for heavy-metal-free extended short-wave infrared (eSWIR) optoelectronics.
  • Synthesizing large InSb QDs (>1700 nm) is challenging due to coupled nucleation and growth in traditional methods.

Purpose of the Study:

  • To develop a novel synthetic route for large, monodisperse InSb QDs.
  • To enable tunable absorption in the eSWIR region (1600-2500 nm).
  • To fabricate high-performance eSWIR photodetectors using these QDs.

Main Methods:

  • A two-step hot-injection method: low-temperature co-reduction followed by growth in hot solvent.
  • Decoupling nucleation and growth stages for independent control.
  • Utilizing non-coordinating solvents like nonadecene to accelerate Ostwald ripening.

Main Results:

  • Achieved monodisperse InSb QDs tunable from 5-12 nm with absorption from 1600-2500 nm.
  • Demonstrated a nonclassical crystallization and growth pathway via amorphous-crystalline intermediates and Ostwald ripening.
  • Fabricated InSb QD-based photoconductors with high responsivity (45.77 mA/W) and EQE (3.03%) at 1875 nm.

Conclusions:

  • The two-step synthesis successfully overcomes limitations of conventional methods for large InSb QD production.
  • This heavy-metal-free InSb QD system is suitable for high-performance eSWIR optoelectronic applications.
  • The developed method provides a pathway for advanced IR detector technologies.