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Ultrafast Carrier Trapping in Thick-Shell Colloidal Quantum Dots.

Ankit Jain¹, Oleksandr Voznyy¹, Marek Korkusinski²

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

The Journal of Physical Chemistry Letters

|June 22, 2017

Summary

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Quantum dot performance is limited by Auger-assisted carrier trapping. Atomistic simulations show that CdSe/CdS core-shell structures require 6 nm shells to fully suppress this trapping, enabling efficient light emission.

Area of Science:

Materials Science
Quantum Mechanics
Nanotechnology

Background:

Auger processes cause femtosecond carrier trapping in quantum dots.
This trapping limits quantum dot performance in optoelectronic devices reliant on radiative recombination.

Purpose of the Study:

Investigate if a protective shell can prevent Auger-assisted carrier trapping in quantum dots.
Determine the shell thickness required for effective carrier protection.

Main Methods:

Atomistic simulations were employed.
Studies focused on Cadmium Selenide/Cadmium Sulfide (CdSe/CdS) core-shell quantum dots.
Quantum dots with total diameters up to 10 nm were analyzed.

Main Results:

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Trapping lifetimes as short as 1 picosecond were observed with 2 nm shells.

Shells with a thickness of 6 nm are necessary to completely suppress carrier trapping.

The primary recombination mechanism involves shallow empty traps.

Conclusions:

Thick shells are crucial for suppressing Auger-assisted trapping in quantum dots.
Eliminating surface traps, potentially through doping or electrochemical potential, is vital for efficient light emission.
Complete eradication of surface traps is necessary even in thick-shell quantum dots for optimal performance.