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

Journal Article · · Journal of Physical Chemistry Letters

In this paper, 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. Additionally, owing to 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-dimensionality 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.

Research Organization:
Argonne National Laboratory (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Chemical Sciences, Geosciences, and Biosciences Division
Grant/Contract Number:
AC02-06CH11357; FG02-99ER14999
OSTI ID:
1491813
Journal Information:
Journal of Physical Chemistry Letters, Vol. 9, Issue 16; ISSN 1948-7185
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 13 works
Citation information provided by
Web of Science

References (49)

Light-emitting diodes made from cadmium selenide nanocrystals and a semiconducting polymer journal August 1994
Full Color Emission from II-VI Semiconductor Quantum Dot-Polymer Composites journal July 2000
Quantum Dots as Cellular Probes journal August 2005
Bioanalytics and biolabeling with semiconductor nanoparticles (quantum dots) journal January 2007
Optical Gain and Stimulated Emission in Nanocrystal Quantum Dots journal October 2000
Effect of Auger Recombination on Lasing in Heterostructured Quantum Dots with Engineered Core/Shell Interfaces journal October 2015
Colloidal Quantum Dot Solar Cells journal June 2015
Hybrid Photovoltaics Based on Semiconductor Nanocrystals and Amorphous Silicon journal March 2009
Semiconductor Clusters, Nanocrystals, and Quantum Dots journal February 1996
Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy journal June 2011
Performance Degradation of High-Brightness Light Emitting Diodes Under DC and Pulsed Bias journal June 2008
Cooling of photovoltaic cells under concentrated illumination: a critical review journal April 2005
Exciton Fate in Semiconductor Nanocrystals at Elevated Temperatures: Hole Trapping Outcompetes Exciton Deactivation journal August 2013
Size- and temperature-dependence of exciton lifetimes in CdSe quantum dots journal August 2006
The effect of Auger heating on intraband carrier relaxation in semiconductor quantum rods journal July 2006
Carrier Cooling in Colloidal Quantum Wells journal February 2012
Observation of Size-Dependent Thermalization in CdSe Nanocrystals Using Time-Resolved Photoluminescence Spectroscopy journal October 2011
Transient Melting and Recrystallization of Semiconductor Nanocrystals Under Multiple Electron–Hole Pair Excitation journal August 2017
Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays journal March 2013
Electron and hole relaxation pathways in semiconductor quantum dots journal November 1999
Intraband relaxation in CdSe quantum dots journal July 1999
Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots journal January 2011
Femtosecond 1 P -to- 1 S Electron Relaxation in Strongly Confined Semiconductor Nanocrystals journal May 1998
Quantization of Multiparticle Auger Rates in Semiconductor Quantum Dots journal February 2000
Multiexcitons confined within a subexcitonic volume: Spectroscopic and dynamical signatures of neutral and charged biexcitons in ultrasmall semiconductor nanocrystals journal December 2003
Scaling of multiexciton lifetimes in semiconductor nanocrystals journal May 2008
Multicarrier recombination in colloidal quantum dots journal September 2007
Multiexciton fluorescence from semiconductor nanocrystals journal November 2005
Multiple temperature regimes of radiative decay in CdSe nanocrystal quantum dots: Intrinsic limits to the dark-exciton lifetime journal April 2003
Theory of Thermal Relaxation of Electrons in Semiconductors journal September 2017
Reverse Non-Equilibrium Molecular Dynamics Demonstrate That Surface Passivation Controls Thermal Transport at Semiconductor–Solvent Interfaces journal May 2015
Identification of parameters through which surface chemistry determines the lifetimes of hot electrons in small Au nanoparticles journal February 2013
Study of Heat Transfer Dynamics from Gold Nanorods to the Environment via Time-Resolved Infrared Spectroscopy journal January 2016
Energy Flow from Solute to Solvent Probed by Femtosecond IR Spectroscopy: Malachite Green and Heme Protein Solutions journal November 1994
Phonon Spectra of Small Colloidal II-VI Semiconductor Nanocrystals journal September 2012
Size-Dependent Photoconductivity in CdSe Nanoparticles as Measured by Time-Resolved Terahertz Spectroscopy journal September 2002
Direct Measurement of Lattice Dynamics and Optical Phonon Excitation in Semiconductor Nanocrystals Using Femtosecond Stimulated Raman Spectroscopy journal September 2013
Femtosecond stimulated Raman spectroscopy journal December 2010
Femtosecond Stimulated Raman Spectroscopy journal May 2007
Vibrational Dynamics of a Perylene–Perylenediimide Donor–Acceptor Dyad Probed with Femtosecond Stimulated Raman Spectroscopy journal August 2012
Excited-state Raman spectroscopy with and without actinic excitation: S 1 Raman spectra of trans-azobenzene journal May 2014
Resonance Femtosecond-Stimulated Raman Spectroscopy without Actinic Excitation Showing Low-Frequency Vibrational Activity in the S 2 State of All-Trans β-Carotene journal March 2015
Theory of femtosecond stimulated Raman spectroscopy journal August 2004
Quantum theory of (femtosecond) time-resolved stimulated Raman scattering journal April 2008
Resonance Raman depolarization in CdSe nanocrystals journal March 1993
The “Surface Optical” Phonon in CdSe Nanocrystals journal March 2014
Optical Studies of Dynamics in Noble Metal Nanostructures journal June 2011
Auger Processes in Nanosize Semiconductor Crystals book January 2003
Screening of hot-carrier relaxation in highly photoexcited semiconductors journal February 1981

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