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Atomistically resolved hot exciton relaxation dynamics in CdSe quantum dots: Experiment and theory

Journal Article · · The Journal of Chemical Physics
DOI:https://doi.org/10.1063/5.0272621· OSTI ID:2998202

Semiconductor quantum dots (QDs) are well known to give rise to a quantum confined structure of excitons. Because of this quantum confinement, new physics of hot exciton relaxation dynamics arises. Decades of work using transient absorption (TA) spectroscopy have yielded initial simple observations, such as estimates of the cooling rate from single pump photon energy experiments. More detailed TA experiments employed variable pump photon energies to measure excitonic state-resolved transition rates. These TA measurements, usually the simplest form, have been employed to characterize QDs and their relaxation dynamics to this day. Yet, these TA measurements are fundamentally lacking in their ability to measure energy-resolved hot exciton cooling, which requires observation of the full cooling history through the real excitonic manifold. Here, we employ coherent multi-dimensional spectroscopy (CMDS) to perform an atomistically directed study of hot exciton cooling in CdSe QDs, revealing energy resolved relaxation dynamics. CMDS experiments are compared with simulations and prior TA measurements and simpler theories. Our findings reveal a hot exciton relaxation dynamics landscape. This relaxation dynamics landscape is a linear or sub-linear function of excess energy for different structures of QDs, with a strong size dependence. Furthermore, our model simulations parameterized by the empirical pseudopotential model reproduces the experimental functional form and the dependence upon QD diameter and shell.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE); USDOE Office of Science (SC), High Energy Physics (HEP); USDOE Office of Science (SC), Basic Energy Sciences (BES). Scientific User Facilities (SUF)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2998202
Journal Information:
The Journal of Chemical Physics, Journal Name: The Journal of Chemical Physics Journal Issue: 10 Vol. 163; ISSN 1089-7690; ISSN 0021-9606
Publisher:
AIP PublishingCopyright Statement
Country of Publication:
United States
Language:
English

References (114)

Intraband Cooling in All‐Inorganic and Hybrid Organic–Inorganic Perovskite Nanocrystals journal July 2019
Fast Parallel Algorithms for Short-Range Molecular Dynamics journal March 1995
Breaking the phonon bottleneck in nanometer quantum dots: Role of Auger-like processes journal January 1995
Two-dimensional electronic spectroscopy journal November 1998
Surface and interface effects on non-radiative exciton recombination and relaxation dynamics in CdSe/Cd,Zn,S nanocrystals journal June 2016
Spin relaxation in zinc blende and wurtzite CdSe quantum dots journal May 2010
Quantum size effect in semiconductor microcrystals journal December 1985
Coherent Two-Dimensional and Broadband Electronic Spectroscopies journal January 2022
Spectroscopic and Device Aspects of Nanocrystal Quantum Dots journal September 2016
Role of Atomic Structure on Exciton Dynamics and Photoluminescence in NIR Emissive InAs/InP/ZnSe Quantum Dots journal April 2022
Spectator Exciton Effects on Nanocrystal Photophysics II: PbS journal November 2022
Controlling the Surface of Semiconductor Nanocrystals for Efficient Light Emission from Single Excitons to Multiexcitons journal June 2015
Interfacial Electronic Structure in Graded Shell Nanocrystals Dictates Their Performance for Optical Gain journal August 2016
Excited State Phononic Processes in Semiconductor Nanocrystals Revealed by Excitonic State-Resolved Pump/Probe Spectroscopy journal January 2019
Solving Quantum-Dot Excitonic Riddles with Absolute Pump–Probe Spectroscopy journal September 2021
Origin of Vibronic Coherences During Carrier Cooling in Colloidal Quantum Dots journal December 2023
Two-Dimensional Electronic Spectroscopy Reveals Dynamics within the Bright Fine Structure of CdSe Quantum Dots journal February 2024
Spin Blockades to Relaxation of Hot Multiexcitons in Nanocrystals journal April 2019
Interplay of Surface and Interior Modes in Exciton–Phonon Coupling at the Nanoscale journal October 2021
Polaritonic Bottleneck in Colloidal Quantum Dots journal November 2023
Intrinsically Slow Cooling of Hot Electrons in CdSe Nanocrystals Compared to CdS journal December 2024
Origins of Stokes Shift in PbS Nanocrystals journal November 2017
Tuning Electron–Phonon Interactions in Nanocrystals through Surface Termination journal March 2018
Seeing Multiexcitons through Sample Inhomogeneity: Band-Edge Biexciton Structure in CdSe Nanocrystals Revealed by Two-Dimensional Electronic Spectroscopy journal March 2018
Phonon-Mediated and Weakly Size-Dependent Electron and Hole Cooling in CsPbBr 3 Nanocrystals Revealed by Atomistic Simulations and Ultrafast Spectroscopy journal February 2020
Nanocrystal Quantum Dots: From Discovery to Modern Development journal April 2021
Strongly Confined CsPbBr3 Quantum Dots as Quantum Emitters and Building Blocks for Rhombic Superlattices journal January 2023
Breaking Phonon Bottlenecks through Efficient Auger Processes in Perovskite Nanocrystals journal February 2023
Ligands Slow Down Pure-Dephasing in Semiconductor Quantum Dots journal August 2015
Hole Cooling Is Much Faster than Electron Cooling in PbSe Quantum Dots journal December 2015
Broadband Cooling Spectra of Hot Electrons and Holes in PbSe Quantum Dots journal May 2017
Origins of the Stokes Shift in PbS Quantum Dots: Impact of Polydispersity, Ligands, and Defects journal February 2018
Unraveling the Structure and Dynamics of Excitons in Semiconductor Quantum Dots journal January 2011
Photoinduced Dynamics in Semiconductor Quantum Dots: Insights from Time-Domain ab Initio Studies journal December 2009
Spectator Exciton Effects in Nanocrystals III: Unveiling the Stimulated Emission Cross Section in Quantum Confined CsPbBr3 Nanocrystals journal July 2024
Mechanisms for Photogeneration and Recombination of Multiexcitons in Semiconductor Nanocrystals:  Implications for Lasing and Solar Energy Conversion journal August 2006
Hot Exciton Relaxation Dynamics in Semiconductor Quantum Dots: Radiationless Transitions on the Nanoscale journal October 2011
Theoretical Study of Electron–Phonon Relaxation in PbSe and CdSe Quantum Dots: Evidence for Phonon Memory journal October 2011
Control of Phonons in Semiconductor Nanocrystals via Femtosecond Pulse Chirp-Influenced Wavepacket Dynamics and Polarization journal September 2013
State-Resolved Exciton−Phonon Couplings in CdSe Semiconductor Quantum Dots journal May 2008
High-Energy Excitonic Transitions in CdSe Quantum Dots journal August 1998
Optical Nonlinearities and Ultrafast Carrier Dynamics in Semiconductor Nanocrystals journal July 2000
Ultrafast Exciton Fine Structure Relaxation Dynamics in Lead Chalcogenide Nanocrystals journal May 2008
Bulklike Hot Carrier Dynamics in Lead Sulfide Quantum Dots journal July 2010
Controlling Piezoelectric Response in Semiconductor Quantum Dots via Impulsive Charge Localization journal July 2010
Slow Hot-Carrier Relaxation in Colloidal Graphene Quantum Dots journal January 2011
Femtosecond Cooling of Hot Electrons in CdSe Quantum-Well Platelets journal March 2015
Surface Ligands Increase Photoexcitation Relaxation Rates in CdSe Quantum Dots journal June 2012
Three-Pulse Femtosecond Spectroscopy of PbSe Nanocrystals: 1S Bleach Nonlinearity and Sub-Band-Edge Excited-State Absorption Assignment journal January 2015
Breaking the Phonon Bottleneck in PbSe and CdSe Quantum Dots: Time-Domain Density Functional Theory of Charge Carrier Relaxation journal December 2008
Observation of a phonon bottleneck in copper-doped colloidal quantum dots journal October 2019
Two-dimensional electronic spectroscopy reveals liquid-like lineshape dynamics in CsPbI3 perovskite nanocrystals journal October 2019
Circumventing the phonon bottleneck by multiphonon-mediated hot exciton cooling at the nanoscale journal August 2023
Ultrafast hole relaxation dynamics in quantum dots revealed by two-dimensional electronic spectroscopy journal March 2023
Two-dimensional electronic spectroscopy journal November 2023
Testing the fate of nascent holes in CdSe nanocrystals with sub-10 fs pump–probe spectroscopy journal January 2021
Colloidal chemical synthesis and characterization of InAs nanocrystal quantum dots journal September 1996
Comparison of the k⋅p and the direct diagonalization approaches for describing the electronic structure of quantum dots journal December 1997
Comment on “Comparison of the k⋅p and the direct diagonalization approaches for describing the electron structure of quantum dots” [Appl. Phys. Lett. 71, 3433 (1997)] journal August 1998
Two-dimensional Fourier transform electronic spectroscopy journal October 2001
State-resolved studies of biexcitons and surface trapping dynamics in semiconductor quantum dots journal August 2008
Experimental tests of effective mass and atomistic approaches to quantum dot electronic structure: Ordering of electronic states journal June 2009
Electron–electron and electron‐hole interactions in small semiconductor crystallites: The size dependence of the lowest excited electronic state journal May 1984
The band edge luminescence of surface modified CdSe nanocrystallites: Probing the luminescing state journal June 1997
Kilohertz generation of high contrast polarization states for visible femtosecond pulses via phase-locked acousto-optic pulse shapers journal September 2015
Coherent multi-dimensional spectroscopy at optical frequencies in a single beam with optical readout journal September 2017
Investigating exciton structure and dynamics in colloidal CdSe quantum dots with two-dimensional electronic spectroscopy journal August 2018
An analysis of hollow-core fiber for applications in coherent femtosecond spectroscopies journal September 2020
Investigating the electronic structure of confined multiexcitons with nonlinear spectroscopies journal March 2020
Fifth-order two-quantum absorptive two-dimensional electronic spectroscopy of CdSe quantum dots journal December 2020
Simulations of nonradiative processes in semiconductor nanocrystals journal July 2022
Exciton–polaron interactions in metal halide perovskite nanocrystals revealed via two-dimensional electronic spectroscopy journal November 2023
Polariton-assisted incoherent to coherent excitation energy transfer between colloidal nanocrystal quantum dots journal October 2024
Atomic fluctuations in electronic materials revealed by dephasing journal May 2020
State-to-state exciton dynamics in semiconductor quantum dots journal December 2006
Unified picture of electron and hole relaxation pathways in semiconductor quantum dots journal June 2007
Size dependent, state-resolved studies of exciton-phonon couplings in strongly confined semiconductor quantum dots journal June 2008
Direct observation of the structure of band-edge biexcitons in colloidal semiconductor CdSe quantum dots journal August 2009
State-resolved observation in real time of the structural dynamics of multiexcitons in semiconductor nanocrystals journal December 2011
Gain Control in Semiconductor Quantum Dots via State-Resolved Optical Pumping journal March 2009
Spectral Analysis of Photoemissive Yields in Si, Ge, GaAs, GaSb, InAs, and InSb journal August 1965
Band Structures and Pseudopotential Form Factors for Fourteen Semiconductors of the Diamond and Zinc-blende Structures journal January 1966
Phonon scattering and energy relaxation in two-, one-, and zero-dimensional electron gases journal November 1990
Local-density-derived semiempirical pseudopotentials journal June 1995
Measurement and assignment of the size-dependent optical spectrum in CdSe quantum dots journal June 1996
Size dependence of exciton fine structure in CdSe quantum dots journal June 1996
Band-edge exciton in quantum dots of semiconductors with a degenerate valence band: Dark and bright exciton states journal August 1996
Electron and hole relaxation pathways in semiconductor quantum dots journal November 1999
Many-body pseudopotential theory of excitons in InP and CdSe quantum dots journal July 1999
Ultrafast dynamics of inter- and intraband transitions in semiconductor nanocrystals: Implications for quantum-dot lasers journal July 1999
Mechanisms for intraband energy relaxation in semiconductor quantum dots: The role of electron-hole interactions journal May 2000
Electron-hole excitations and optical spectra from first principles journal August 2000
Hole intraband relaxation in strongly confined quantum dots: Revisiting the “phonon bottleneck” problem journal January 2002
Optical transitions and nature of Stokes shift in spherical CdS quantum dots journal April 2006
Stillinger-Weber potential for the II-VI elements Zn-Cd-Hg-S-Se-Te journal August 2013
Long-Range Electronic-to-Vibrational Energy Transfer from Nanocrystals to Their Surrounding Matrix Environment journal February 2008
Observation of the "Dark Exciton" in CdSe Quantum Dots journal November 1995
Direct Pseudopotential Calculation of Exciton Coulomb and Exchange Energies in Semiconductor Quantum Dots journal February 1997
Femtosecond 1 P -to- 1 S Electron Relaxation in Strongly Confined Semiconductor Nanocrystals journal May 1998
Pseudopotential Theory of Auger Processes in CdSe Quantum Dots journal July 2003
Breaking the Phonon Bottleneck in Semiconductor Nanocrystals via Multiphonon Emission Induced by Intrinsic Nonadiabatic Interactions journal October 2005
Direct Observation of Electron-to-Hole Energy Transfer in CdSe Quantum Dots journal February 2006
Breaking the Phonon Bottleneck for Holes in Semiconductor Quantum Dots journal April 2007
Polaronic quantum confinement in bulk CsPbBr3 perovskite crystals revealed by state-resolved pump/probe spectroscopy journal May 2021
Relations between absorption, emission, and excited state chemical potentials from nanocrystal 2D spectra journal May 2021
CHEMISTRY: Multidimensional Snapshots of Chemical Dynamics journal September 2004
Slow Electron Cooling in Colloidal Quantum Dots journal November 2008
The Electronic Structure of Semiconductor Nanocrystals journal August 2000
The Quantum Mechanics of Larger Semiconductor Clusters ("Quantum Dots") journal October 1990
S PECTROSCOPY AND H OT E LECTRON R ELAXATION D YNAMICS IN S EMICONDUCTOR Q UANTUM W ELLS AND Q UANTUM D OTS journal October 2001
T WO -D IMENSIONAL F EMTOSECOND S PECTROSCOPY journal October 2003
Spectral and Dynamical Properties of Multiexcitons in Semiconductor Nanocrystals journal May 2007
OPA-driven hollow-core fiber as a tunable, broadband source for coherent multidimensional spectroscopy journal August 2021
Simple fiber-based solution for coherent multidimensional spectroscopy in the visible regime journal January 2017