Justin C. Ondry
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View article: Exciton-phonon coupling and phonon-assisted exciton relaxation dynamics in In1-xGaxP quantum dots
Exciton-phonon coupling and phonon-assisted exciton relaxation dynamics in In1-xGaxP quantum dots Open
Quantum dots leverage quantum confinement to modify the electronic structure of materials, separating electronic transitions from the composition of the corresponding bulk material. With ternary quantum dots, the composition may be varied …
View article: Colloidal Dispersions of Sterically and Electrostatically Stabilized PbS Quantum Dots: Structure Factors, Second Virial Coefficients, and Film-Forming Properties
Colloidal Dispersions of Sterically and Electrostatically Stabilized PbS Quantum Dots: Structure Factors, Second Virial Coefficients, and Film-Forming Properties Open
Electrostatically stabilized nanocrystals (NCs) and, in particular, quantum dots (QDs) hold promise for forming strongly coupled superlattices due to their compact and electronically conductive surface ligands. However, studies of the coll…
View article: Ultrafast Symmetry Control in Photoexcited Quantum Dots
Ultrafast Symmetry Control in Photoexcited Quantum Dots Open
Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nev…
View article: Reductive pathways in molten inorganic salts enable colloidal synthesis of III-V semiconductor nanocrystals
Reductive pathways in molten inorganic salts enable colloidal synthesis of III-V semiconductor nanocrystals Open
Colloidal quantum dots, with their size-tunable optoelectronic properties and scalable synthesis, enable applications in which inexpensive high-performance semiconductors are needed. Synthesis science breakthroughs have been key to the rea…
View article: Ultrafast symmetry control in photoexcited quantum dots
Ultrafast symmetry control in photoexcited quantum dots Open
Symmetry control is essential for realizing unconventional properties, such as ferroelectricity, nonlinear optical responses, and complex topological order, thus it holds promise for the design of emerging quantum and photonic systems. Nev…
View article: Automated High-Resolution Phase-Contrast Scanning Transmission Electron Microscopy
Automated High-Resolution Phase-Contrast Scanning Transmission Electron Microscopy Open
Here, in this presentation, we demonstrate the operation and applications of a custom-built automation program to acquire high-resolution data on an aberration-corrected STEM.
View article: Colloidal dispersions of sterically and electrostatically stabilized PbS quantum dots: the effect of stabilization mechanism on structure factors, second virial coefficients, and film-forming properties
Colloidal dispersions of sterically and electrostatically stabilized PbS quantum dots: the effect of stabilization mechanism on structure factors, second virial coefficients, and film-forming properties Open
Electrostatically stabilized nanocrystals (NCs) and, in particular, quantum dots (QDs) hold promise for forming strongly coupled superlattices due to their compact and electronically conductive surface ligands. However, studies on the coll…
View article: An artificial intelligence’s interpretation of complex high-resolution in situ transmission electron microscopy data
An artificial intelligence’s interpretation of complex high-resolution in situ transmission electron microscopy data Open
View article: A composite electrodynamic mechanism to reconcile spatiotemporally resolved exciton transport in quantum dot superlattices
A composite electrodynamic mechanism to reconcile spatiotemporally resolved exciton transport in quantum dot superlattices Open
Quantum dot (QD) solids are promising optoelectronic materials; further advancing their device functionality requires understanding their energy transport mechanisms. The commonly invoked near-field Förster resonance energy transfer (FRET)…
View article: Advanced techniques in automated high-resolution scanning transmission electron microscopy
Advanced techniques in automated high-resolution scanning transmission electron microscopy Open
Scanning transmission electron microscopy is a common tool used to study the atomic structure of materials. It is an inherently multimodal tool allowing for the simultaneous acquisition of multiple information channels. Despite its versati…
View article: Composition-Defined Optical Properties and the Direct-to-Indirect Transition in Core–Shell In<sub>1–<i>x</i></sub>Ga<i><sub>x</sub></i>P/ZnS Colloidal Quantum Dots
Composition-Defined Optical Properties and the Direct-to-Indirect Transition in Core–Shell In<sub>1–<i>x</i></sub>Ga<i><sub>x</sub></i>P/ZnS Colloidal Quantum Dots Open
Semiconductors are commonly divided into materials with direct or indirect band gaps based on the relative positions of the top of the valence band and the bottom of the conduction band in crystal momentum (k) space. It has, however…
View article: Design Rules for Obtaining Narrow Luminescence from Semiconductors Made in Solution
Design Rules for Obtaining Narrow Luminescence from Semiconductors Made in Solution Open
Solution-processed semiconductors are in demand for present and next-generation optoelectronic technologies ranging from displays to quantum light sources because of their scalability and ease of integration into devices with diverse form …
View article: An artificial intelligence's interpretation of complex high-resolution in situ transmission electron microscopy data
An artificial intelligence's interpretation of complex high-resolution in situ transmission electron microscopy data Open
In situ transmission electron microscopy (TEM) has enabled researchers to visualize complicated nano- and atomic-scale processes with sub-Angstrom spatial resolution and millisecond time resolution. These processes are often highly dynamic…
View article: Design rules for obtaining narrow luminescence from semiconductors made in solution
Design rules for obtaining narrow luminescence from semiconductors made in solution Open
Solution processed semiconductors are in demand for present and next-generation optoelectronic technologies ranging from displays to quantum light sources because of their scalability and ease of integration into devices with diverse form …
View article: An artificial intelligence’s interpretation of complex high-resolution in situ transmission electron microscopy data
An artificial intelligence’s interpretation of complex high-resolution in situ transmission electron microscopy data Open
In situ transmission electron microscopy (TEM) has enabled researchers to visualize complicated nano- and atomic-scale processes with sub-Angstrom spatial resolution and millisecond time resolution. These processes are often highly dynamic…
View article: EELS Studies of Cerium Electrolyte Reveal Substantial Solute Concentration Effects in Graphene Liquid Cells
EELS Studies of Cerium Electrolyte Reveal Substantial Solute Concentration Effects in Graphene Liquid Cells Open
Graphene liquid cell transmission electron microscopy is a powerful technique to visualize nanoscale dynamics and transformations at atomic resolution. However, the solution in liquid cells is known to be affected by radiolysis, and the st…
View article: An artificial intelligence's interpretation of complex high-resolution in situ transmission electron microscopy data
An artificial intelligence's interpretation of complex high-resolution in situ transmission electron microscopy data Open
In situ transmission electron microscopy (TEM) has enabled researchers to visualize complicated nano- and atomic-scale processes with sub-Angstrom spatial resolution and millisecond time resolution. These processes are often highly dynamic…
View article: A composite electrodynamic mechanism to reconcile spatiotemporally resolved exciton transport in quantum dot superlattices
A composite electrodynamic mechanism to reconcile spatiotemporally resolved exciton transport in quantum dot superlattices Open
Quantum dot (QD) solids are promising optoelectronic materials; further advancing their device functionality depends on understanding their energy transport mechanisms. The commonly invoked near-field Förster resonance energy transfer (FRE…
View article: Design rules for obtaining narrow luminescence from semiconductors made in solution
Design rules for obtaining narrow luminescence from semiconductors made in solution Open
Solution processed semiconductors are in demand for present and next-generation optoelectronic technologies ranging from displays to quantum light sources because of their scalability and ease of integration into devices with diverse form …
View article: An Artificial Intelligence's Interpretation of Complex High-Resolution in situ Transmission Electron Microscopy Data
An Artificial Intelligence's Interpretation of Complex High-Resolution in situ Transmission Electron Microscopy Data Open
View article: Examining the Role of Chloride Ligands on Defect Removal in Imperfectly Attached Semiconductor Nanocrystals for 1D and 2D Attachment Cases
Examining the Role of Chloride Ligands on Defect Removal in Imperfectly Attached Semiconductor Nanocrystals for 1D and 2D Attachment Cases Open
Semiconducting, core-shell nanocrystals (NCs) are promising building blocks for the construction of higher dimensional artificial nanostructures using oriented attachment. However, the assembly and epitaxial attachment steps critical to th…
View article: Diffusion-Limited Kinetics of Isovalent Cation Exchange in III–V Nanocrystals Dispersed in Molten Salt Reaction Media
Diffusion-Limited Kinetics of Isovalent Cation Exchange in III–V Nanocrystals Dispersed in Molten Salt Reaction Media Open
The goal of this work is to determine the kinetic factors that govern isovalent cation exchange in III-V colloidal quantum dots using molten salts as the solvent and cation source. We focus on the reactions of InP + GaI3→ In
View article: Facet-selective etching trajectories of individual semiconductor nanocrystals
Facet-selective etching trajectories of individual semiconductor nanocrystals Open
The size and shape of semiconductor nanocrystals govern their optical and electronic properties. Liquid cell transmission electron microscopy (LCTEM) is an emerging tool that can directly visualize nanoscale chemical transformations and th…
View article: Research Group-Led Undergraduate Research Program: Analyzing and Improving a Versatile Springboard for First-Year Undergraduates
Research Group-Led Undergraduate Research Program: Analyzing and Improving a Versatile Springboard for First-Year Undergraduates Open
Increasing access to undergraduate research is critical in efforts to retain students pursuing careers in STEM. Alternatives to traditional research positions, such as course based undergraduate research experiences (CUREs), have played im…
View article: Direct Optical Lithography of CsPbX<sub>3</sub> Nanocrystals via Photoinduced Ligand Cleavage with Postpatterning Chemical Modification and Electronic Coupling
Direct Optical Lithography of CsPbX<sub>3</sub> Nanocrystals via Photoinduced Ligand Cleavage with Postpatterning Chemical Modification and Electronic Coupling Open
Microscale patterning of solution-processed nanomaterials is important for integration in functional devices. Colloidal lead halide perovskite (LHP) nanocrystals (NCs) can be particularly challenging to pattern due to their incompatibility…
View article: Redox Mediated Control of Electrochemical Potential in Liquid Cell Electron Microscopy
Redox Mediated Control of Electrochemical Potential in Liquid Cell Electron Microscopy Open
Liquid cell electron microscopy enables the study of nanoscale transformations in solvents with high spatial and temporal resolution, but for the technique to achieve its potential requires a new level of control over the reactivity caused…
View article: Elucidating the Role of Halides and Iron during Radiolysis-Driven Oxidative Etching of Gold Nanocrystals Using Liquid Cell Transmission Electron Microscopy and Pulse Radiolysis
Elucidating the Role of Halides and Iron during Radiolysis-Driven Oxidative Etching of Gold Nanocrystals Using Liquid Cell Transmission Electron Microscopy and Pulse Radiolysis Open
Graphene liquid cell transmission electron microscopy (TEM) has enabled the observation of a variety of nanoscale transformations. Yet understanding the chemistry of the liquid cell solution and its impact on the observed transformations r…
View article: Characterization of Carrier Cooling Bottleneck in Silicon Nanoparticles by Extreme Ultraviolet (XUV) Transient Absorption Spectroscopy
Characterization of Carrier Cooling Bottleneck in Silicon Nanoparticles by Extreme Ultraviolet (XUV) Transient Absorption Spectroscopy Open
Silicon nanoparticles have the promise to surpass the theoretical efficiency limit of single-junction silicon photovoltaics by the creation of a "phonon bottleneck", a theorized slowing of the cooling rate of hot optical phonons that in tu…
View article: Characterization of Carrier Cooling Bottleneck in Silicon Nanoparticles\n by Extreme Ultraviolet (XUV) Transient Absorption Spectroscopy
Characterization of Carrier Cooling Bottleneck in Silicon Nanoparticles\n by Extreme Ultraviolet (XUV) Transient Absorption Spectroscopy Open
Silicon nanoparticles have the promise to surpass the theoretical efficiency\nlimit of single-junction silicon photovoltaics by the creation of a "phonon\nbottleneck", a theorized slowing of the cooling rate of hot optical phonons\nthat in…
View article: AutoDetect-mNP: An Unsupervised Machine Learning Algorithm for Automated Analysis of Transmission Electron Microscope Images of Metal Nanoparticles
AutoDetect-mNP: An Unsupervised Machine Learning Algorithm for Automated Analysis of Transmission Electron Microscope Images of Metal Nanoparticles Open
The synthesis quality of artificial inorganic nanocrystals is most often assessed by transmission electron microscopy (TEM) for which high-throughput advances have dramatically increased both the quantity and information richness of metal …