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Fabrication and Operation of a Nano-Optical Conveyor Belt

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Single Trap States in Single CdSe Nanoplatelets.

Stijn O M Hinterding^1,2, Bastiaan B V Salzmann³, Sander J W Vonk^1,2

¹Soft Condensed Matter, Debye Institute for Nanomaterials Science, Utrecht University, Princetonplein 1, 3584CC Utrecht, The Netherlands.

|March 24, 2021

Summary

This summary is machine-generated.

Studying trap states in semiconductor nanocrystals reveals that reversible hole trapping causes delayed and near-infrared photoluminescence (PL). This research offers insights into trap state inhomogeneity at the single-particle level.

Keywords:

CdSe nanoplatelets single-particle spectroscopy spectral diffusion transient absorption trap states

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Area of Science:

Materials Science
Quantum Dots
Nanotechnology

Background:

Trap states significantly impact semiconductor nanocrystal photoluminescence (PL), causing quenching, delays, and spectral shifts.
Studying trap states is challenging, especially at the single-trap level, hindering detailed analysis.
Cadmium Selenide (CdSe) nanoplatelets (NPLs) display notable delayed and near-infrared emission, indicative of trap state activity.

Purpose of the Study:

To investigate trap states in CdSe NPLs using delayed and trap emission as spectroscopic probes.
To elucidate the role of reversible hole trapping in influencing photoluminescence properties.
To characterize trap states at both ensemble and single-particle levels.

Main Methods:

Utilizing photoluminescence (PL) spectroscopy to analyze delayed emission and near-infrared trap emission from CdSe NPLs.
Employing single-particle spectroscopy to resolve individual trap state dynamics.
Correlating delayed PL and trap PL to understand the underlying trapping mechanisms.

Main Results:

Reversible hole trapping was identified as the source of both delayed and trap PL, originating from the same trap states.
Single-particle studies revealed exponential decay kinetics for delayed and trap PL, with lifetimes spanning 40–1300 ns.
Single-trap PL exhibited spectral diffusion and single-photon emission, contrasting with exciton PL.

Conclusions:

The findings demonstrate that reversible hole trapping is a key mechanism governing delayed and trap emission in CdSe NPLs.
Single-particle analysis highlights significant inhomogeneity of trap states, even within individual nanocrystals.
This work provides a deeper understanding of trap state dynamics and their impact on the optical properties of semiconductor nanocrystals.