Carrier relaxation dynamics in lead sulfide colloidal quantum dots

Emanuel Istrate; Sjoerd Hoogland; Vlad Sukhovatkin; Larissa Levina; Stefan Myrskog; Peter W.E. Smith; Edward H. Sargent

doi:10.1021/jp076809g

Carrier relaxation dynamics in lead sulfide colloidal quantum dots

Emanuel Istrate^*, Sjoerd Hoogland, Vlad Sukhovatkin, Larissa Levina, Stefan Myrskog, Peter W.E. Smith, Edward H. Sargent

^*Corresponding author for this work

Chemistry

Research output: Contribution to journal › Article › peer-review

10 Scopus citations

Abstract

We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 × 10^-30 cm⁶/s for dots of 5.5 nm diameter, and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements.

Original language	English (US)
Pages (from-to)	2757-2760
Number of pages	4
Journal	Journal of Physical Chemistry B
Volume	112
Issue number	10
DOIs	https://doi.org/10.1021/jp076809g
State	Published - Mar 13 2008

ASJC Scopus subject areas

Physical and Theoretical Chemistry
Surfaces, Coatings and Films
Materials Chemistry

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title = "Carrier relaxation dynamics in lead sulfide colloidal quantum dots",

abstract = "We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 × 10-30 cm6/s for dots of 5.5 nm diameter, and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements.",

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T1 - Carrier relaxation dynamics in lead sulfide colloidal quantum dots

AU - Istrate, Emanuel

AU - Hoogland, Sjoerd

AU - Sukhovatkin, Vlad

AU - Levina, Larissa

AU - Myrskog, Stefan

AU - Smith, Peter W.E.

AU - Sargent, Edward H.

PY - 2008/3/13

Y1 - 2008/3/13

N2 - We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 × 10-30 cm6/s for dots of 5.5 nm diameter, and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements.

AB - We report transient absorption saturation measurements on lead sulfide colloidal nanocrystals at the first and second exciton energies and fit the results to a model incorporating intraband and interband relaxation processes. We study in detail the Auger recombination from the first excited state, which takes place when more than one electron-hole pair is excited in a dot. We find an Auger coefficient of 4.5 × 10-30 cm6/s for dots of 5.5 nm diameter, and observe saturation of the absorption bleaching when the (8-fold degenerate) first level is filled. We develop a model for the absorption dynamics using Poisson statistics and find a good fit with our experimental measurements.

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Carrier relaxation dynamics in lead sulfide colloidal quantum dots

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