Auger Heating and Thermal Dissipation in Zero-Dimensional CdSe Nanocrystals Examined Using Femtosecond Stimulated Raman Spectroscopy

The Journal of Physical Chemistry Letters
Samantha M HarveyRichard D Schaller

Abstract

We report femtosecond stimulated Raman spectroscopy (FSRS) measurements on dispersions of CdSe semiconductor nanocrystals (NCs) as a function of particle size and pump fluence. Upon photoexcitation, we observe depletion of stimulated Raman gain corresponding to generation of longitudinal optical (LO) phonons followed by recovery on picosecond timescales. At higher fluences, production of multiple excitons slows recovery of FSRS signals, which we attribute to sustained increases of LO phonon populations due to multiexcitonic Auger heating. Owing to the discretized electronic structure of these NCs, such heating cannot be readily monitored via electronic spectroscopic analysis of high-energy band tails as has been performed for higher-dimensional materials. Notably, recovery timescales exceed those of the biexcitonic Auger recombination process and as such reveal overall thermalization timescales likely owing to an acoustic phonon thermalization bottleneck that dictates the cooling timescale.

References

Aug 15, 1995·Physical Review. B, Condensed Matter·V KlimovH Kurz
Oct 13, 2000·Science·V I KlimovM G Bawendi
Aug 12, 2004·The Journal of Chemical Physics·Soo-Y LeeRichard A Mathies
Jul 12, 2005·Annual Review of Biomedical Engineering·A Paul AlivisatosCarolyn Larabell
Nov 16, 2006·Annual Review of Physical Chemistry·Philipp KukuraRichard A Mathies
Sep 25, 2007·The Journal of Chemical Physics·Anshu Pandey, Philippe Guyot-Sionnest
Apr 17, 2008·The Journal of Chemical Physics·Zhigang SunSoo-Y Lee
Feb 13, 2009·Nano Letters·Baoquan SunVictor I Klimov
Oct 15, 2010·Accounts of Chemical Research·Patanjali Kambhampati
Mar 26, 2011·Chemical Reviews·Gregory V Hartland
Nov 10, 2012·Nano Letters·Matthew PeltonDmitri V Talapin
Feb 27, 2013·Proceedings of the National Academy of Sciences of the United States of America·Kenneth O ArudaEmily A Weiss
Mar 19, 2013·Nature Materials·Wee-Liat OngJonathan A Malen
Mar 25, 2014·ACS Nano·Chen LinAnne Myers Kelley
May 17, 2014·The Journal of Chemical Physics·A L DobryakovS A Kovalenko
Jun 25, 2015·Chemical Reviews·Graham H CareyEdward H Sargent
Sep 6, 2012·The Journal of Physical Chemistry Letters·Kristen E BrownMichael R Wasielewski
Jan 18, 2018·Physical Review Letters·Sridhar SadasivamPierre Darancet

❮ Previous
Next ❯

Related Concepts

Trending Feeds

COVID-19

Coronaviruses encompass a large family of viruses that cause the common cold as well as more serious diseases, such as the ongoing outbreak of coronavirus disease 2019 (COVID-19; formally known as 2019-nCoV). Coronaviruses can spread from animals to humans; symptoms include fever, cough, shortness of breath, and breathing difficulties; in more severe cases, infection can lead to death. This feed covers recent research on COVID-19.

Blastomycosis

Blastomycosis fungal infections spread through inhaling Blastomyces dermatitidis spores. Discover the latest research on blastomycosis fungal infections here.

Nuclear Pore Complex in ALS/FTD

Alterations in nucleocytoplasmic transport, controlled by the nuclear pore complex, may be involved in the pathomechanism underlying multiple neurodegenerative diseases including Amyotrophic Lateral Sclerosis and Frontotemporal Dementia. Here is the latest research on the nuclear pore complex in ALS and FTD.

Applications of Molecular Barcoding

The concept of molecular barcoding is that each original DNA or RNA molecule is attached to a unique sequence barcode. Sequence reads having different barcodes represent different original molecules, while sequence reads having the same barcode are results of PCR duplication from one original molecule. Discover the latest research on molecular barcoding here.

Chronic Fatigue Syndrome

Chronic fatigue syndrome is a disease characterized by unexplained disabling fatigue; the pathology of which is incompletely understood. Discover the latest research on chronic fatigue syndrome here.

Evolution of Pluripotency

Pluripotency refers to the ability of a cell to develop into three primary germ cell layers of the embryo. This feed focuses on the mechanisms that underlie the evolution of pluripotency. Here is the latest research.

Position Effect Variegation

Position Effect Variagation occurs when a gene is inactivated due to its positioning near heterochromatic regions within a chromosome. Discover the latest research on Position Effect Variagation here.

STING Receptor Agonists

Stimulator of IFN genes (STING) are a group of transmembrane proteins that are involved in the induction of type I interferon that is important in the innate immune response. The stimulation of STING has been an active area of research in the treatment of cancer and infectious diseases. Here is the latest research on STING receptor agonists.

Microbicide

Microbicides are products that can be applied to vaginal or rectal mucosal surfaces with the goal of preventing, or at least significantly reducing, the transmission of sexually transmitted infections. Here is the latest research on microbicides.