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Title: Anisotropic Transient Disordering of Colloidal, Two-Dimensional CdSe Nanoplatelets upon Optical Excitation

Journal Article · · Nano Letters
ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [2];  [1];  [1];  [1];  [1];  [1];  [3];  [3];  [3]; ORCiD logo [1]; ORCiD logo [2];  [1]; ORCiD logo [1]; ORCiD logo [1]; ORCiD logo [4]; ORCiD logo [4]; ORCiD logo [3]; ORCiD logo [5] more »; ORCiD logo [6] « less
  1. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry
  2. Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials
  3. Argonne National Lab. (ANL), Argonne, IL (United States). X-ray Science Div.
  4. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry and Institute for Sustainability and Energy
  5. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry and Institute for Sustainability and Energy; Argonne National Lab. (ANL), Argonne, IL (United States). Chemical Science and Engineering
  6. Northwestern Univ., Evanston, IL (United States). Dept. of Chemistry and Institute for Sustainability and Energy; Argonne National Lab. (ANL), Argonne, IL (United States). Center for Nanoscale Materials

Nanoplatelets (NPLs)-colloidally synthesized, spatially anisotropic, two-dimensional semiconductor quantum wells-are of intense interest owing to exceptionally narrow transition line widths, coupled with solution processability and bandgap tunability. However, given large surface areas and undercoordinated bonding at facet corners and edges, excitation under sufficient intensities may induce anisotropic structural instabilities that impact desired properties. We employ time-resolved X-ray diffraction to study the crystal structure of CdSe NPLs in response to optical excitation. Photoexcitation induces greater out-of-plane than in-plane disordering in 4 and 5 monolayer (ML) NPLs, while 3 ML NPLs display the opposite behavior. Recovery dynamics suggest that out-of-plane cooling slightly outpaces in-plane cooling in 5 ML NPLs with recrystallization occurring on indistinguishable time scales. In comparison, for zero-dimensional CdSe nanocrystals, disordering is isotropic and recovery is faster. These results favor the use of NPLs in optoelectronic applications, where they are likely to exhibit superior performance over traditional, zero-dimensional nanocrystals.

Research Organization:
Argonne National Lab. (ANL), Argonne, IL (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES)
Grant/Contract Number:
AC02-06CH11357; FG02-99ER14999
OSTI ID:
1777227
Journal Information:
Nano Letters, Vol. 21, Issue 3; ISSN 1530-6984
Publisher:
American Chemical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (53)

Time-Resolved X-ray Diffraction Investigation of the Modified Phonon Dispersion in InSb Nanowires journal January 2014
Red, Yellow, Green, and Blue Amplified Spontaneous Emission and Lasing Using Colloidal CdSe Nanoplatelets journal September 2015
Theory of Thermal Relaxation of Electrons in Semiconductors journal September 2017
Real-Time Visualization of Nanocrystal Solid–Solid Transformation Pathways journal March 2014
Nanoparticle Structure by Coherent X-ray Diffraction journal February 2013
Area- and Thickness-Dependent Biexciton Auger Recombination in Colloidal CdSe Nanoplatelets: Breaking the “Universal Volume Scaling Law” journal April 2017
Size/Shape-Controlled Synthesis of Colloidal CdSe Quantum Disks: Ligand and Temperature Effects journal May 2011
Progress, Challenges, and Opportunities in Two-Dimensional Materials Beyond Graphene journal March 2013
Direct Synthesis of Six-Monolayer (1.9 nm) Thick Zinc-Blende CdSe Nanoplatelets Emitting at 585 nm journal September 2018
Core/Shell Colloidal Semiconductor Nanoplatelets journal November 2012
Linear Absorption in CdSe Nanoplates: Thickness and Lateral Size Dependency of the Intrinsic Absorption journal August 2015
Optical heating in semiconductors journal February 1980
A model for the phase stability of arbitrary nanoparticles as a function of size and shape journal September 2004
Transient Melting and Recrystallization of Semiconductor Nanocrystals Under Multiple Electron–Hole Pair Excitation journal August 2017
Rediscovering black phosphorus as an anisotropic layered material for optoelectronics and electronics journal July 2014
Super color purity green quantum dot light-emitting diodes fabricated by using CdSe/CdS nanoplatelets journal January 2016
Melting in Semiconductor Nanocrystals journal June 1992
A strain-induced exciton transition energy shift in CdSe nanoplatelets: the impact of an organic ligand shell journal January 2017
Experimental Determination of the Absorption Cross-Section and Molar Extinction Coefficient of Colloidal CdSe Nanoplatelets journal November 2015
Photoinduced, reversible phase transitions in all-inorganic perovskite nanocrystals journal January 2019
Elevated Temperature Photophysical Properties and Morphological Stability of CdSe and CdSe/CdS Nanoplatelets journal January 2018
Transient Lattice Response upon Photoexcitation in CuInSe 2 Nanocrystals with Organic or Inorganic Surface Passivation journal September 2020
Chloride-Induced Thickness Control in CdSe Nanoplatelets journal September 2018
Ligand-Dependent Tuning of Interband and Intersubband Transitions of Colloidal CdSe Nanoplatelets journal June 2020
Ultrathin Epitaxial Graphite:  2D Electron Gas Properties and a Route toward Graphene-based Nanoelectronics journal December 2004
Optical Signatures of Transiently Disordered Semiconductor Nanocrystals journal September 2018
Charge Carrier Cooling Bottleneck Opens Up Nonexcitonic Gain Mechanisms in Colloidal CdSe Quantum Wells journal March 2019
Two-dimensional materials and their prospects in transistor electronics journal January 2015
Alloyed Heterostructures of CdSe x S 1– x Nanoplatelets with Highly Tunable Optical Gain Performance journal May 2017
Surface chemistry mediates thermal transport in three-dimensional nanocrystal arrays journal March 2013
Record High External Quantum Efficiency of 19.2% Achieved in Light‐Emitting Diodes of Colloidal Quantum Wells Enabled by Hot‐Injection Shell Growth journal December 2019
Synthesis of Air-Stable CdSe/ZnS Core–Shell Nanoplatelets with Tunable Emission Wavelength journal June 2017
Halide Ligands To Release Strain in Cadmium Chalcogenide Nanoplatelets and Achieve High Brightness journal April 2019
Shape-Selective Optical Transformations of CdSe Nanoplatelets Driven by Halide Ion Ligand Exchange journal April 2019
Amplified Spontaneous Emission and Lasing in Colloidal Nanoplatelets journal June 2014
Colloidal Atomic Layer Deposition (c-ALD) using Self-Limiting Reactions at Nanocrystal Surface Coupled to Phase Transfer between Polar and Nonpolar Media journal November 2012
Electronics and optoelectronics of two-dimensional transition metal dichalcogenides journal November 2012
Ultrathin Highly Luminescent Two‐Monolayer Colloidal CdSe Nanoplatelets journal July 2019
Boosting Tunable Blue Luminescence of Halide Perovskite Nanoplatelets through Postsynthetic Surface Trap Repair journal July 2018
2D transition metal dichalcogenides journal June 2017
Dynamic Structural Response and Deformations of Monolayer MoS 2 Visualized by Femtosecond Electron Diffraction journal September 2015
Visualization of nanocrystal breathing modes at extreme strains journal March 2015
Emerging Device Applications for Semiconducting Two-Dimensional Transition Metal Dichalcogenides journal January 2014
Structure Identification of Two-Dimensional Colloidal Semiconductor Nanocrystals with Atomic Flat Basal Planes journal June 2015
Colloidal nanoplatelets with two-dimensional electronic structure journal October 2011
Anisotropic structural dynamics of monolayer crystals revealed by femtosecond surface X-ray scattering journal March 2019
Spontaneous Ripple Formation in MoS 2 Monolayers: Electronic Structure and Transport Effects journal July 2013
Solution Synthesis Approach to Colloidal Cesium Lead Halide Perovskite Nanoplatelets with Monolayer-Level Thickness Control journal January 2016
Size-Dependent Melting Behavior of Colloidal In, Sn and Bi Nanocrystals journal November 2015
From dilute isovalent substitution to alloying in CdSeTe nanoplatelets journal January 2016
Spectroscopy of Single CdSe Nanoplatelets journal July 2012
Rippling ultrafast dynamics of suspended 2D monolayers, graphene journal October 2016
Two-Dimensional Black Phosphorus Carbide: Rippling and Formation of Nanotubes journal April 2020