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Photoelectric Effect

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When light of a particular wavelength strikes a metal surface, electrons are emitted. This is called the photoelectric effect. The minimum frequency of light that can cause such emission of electrons is called the threshold frequency, which is specific to the metal. Light with a frequency lower than the threshold frequency, even if it is of high intensity, cannot initiate the emission of electrons. However, when the frequency is higher than the threshold value, the number of electrons ejected...

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Resonance Fluorescence of an InGaAs Quantum Dot in a Planar Cavity Using Orthogonal Excitation and Detection

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Published on: October 13, 2017

Resurfacing of InAs Colloidal Quantum Dots Equalizes Photodetector Performance across Synthetic Routes.

Hyeong Woo Ban¹, Maral Vafaie¹, Larissa Levina¹

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

Journal of the American Chemical Society

|August 28, 2024

Summary

This summary is machine-generated.

Researchers developed new protocols for synthesizing indium arsenide (InAs) colloidal quantum dots (CQDs). These advancements improve monodispersity and enable high-performance near-infrared photodetectors.

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Area of Science:

Materials Science
Nanotechnology
Quantum Dot Synthesis

Background:

Highly monodispersed Indium Arsenide (InAs) colloidal quantum dots (CQDs) are crucial for advanced optoelectronic devices.
Existing synthesis methods rely on hazardous arsenic precursors like tris-trimethylsilyl arsine ((TMSi)3As) and tris-trimethylgermyl arsine ((TMGe)3As).

Purpose of the Study:

To investigate the synthesis mechanism of InAs CQDs and identify strategies for improved monodispersity and performance.
To address challenges associated with arsenic precursors and surface defects in InAs CQDs.

Main Methods:

Investigated the role of cosurfactants, specifically dioctylamine, in achieving monodispersed InAs populations.
Utilized quantitative ligand analysis to characterize InAs CQDs synthesized with (TMGe)3As.
Developed materials processing strategies, including resurfacing protocols, to remove surface shells and optimize stoichiometry.

Main Results:

Dioctylamine was identified as a key cosurfactant for producing monodispersed InAs CQDs.
Synthesis using (TMGe)3As resulted in In-rich InAs CQDs with an amorphous In-oleate surface shell, leading to surface defects.
Developed tailored resurfacing protocols to achieve balanced In-to-As stoichiometry, independent of the synthetic route.

Conclusions:

Optimized InAs CQD synthesis through understanding precursor mechanisms and employing effective resurfacing strategies.
Fabricated near-infrared (NIR) photodetectors with best-in-class external quantum efficiencies (EQEs) at 940 nm, demonstrating the efficacy of the developed protocols.