Index Catalog // Arch : Northwestern University Institutional Repository

Non-Equilibrium Structural and Electronic Dynamics in Perovskite Semiconductors

Description:: Recent progress in semiconductor synthesis and photophysics has revealed a host of new materials with exciting properties for applications in optoelectronic devices such as sensors, photovoltaics, solid state lighting, and more. One of the most significant recent additions to the field is the class of hybrid and inorganic materials that...
Subject:: Physical chemistry, Chemistry, and Materials Science
Creator:: Cuthriell, Shelby A
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 08/23/2023
Date Created:: 2023-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:16650 and etdadmin_upload_1000360

Electrostatic Mechanisms for Shape Selection in Charged Chiral Molecular Assemblies

Description:: How molecular chirality manifests at the nano- to macroscale has been a scientific puzzle since Louis Pasteur discovered biochirality. In general, amphiphilic molecules can organize into a variety of assembly shapes including micelles, spherical vesicles, cylindrical micelles, and planar bilayers. However, when such amphiphilic molecules are chiral, helical ribbons, helicoidal...
Keyword:: self-assembly, soft mattter, electrostatics, membranes, chiral, and charge
Subject:: Physical chemistry, Physics, and Materials Science
Creator:: McCourt, Joseph
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 08/23/2023
Date Created:: 2023-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:16654 and etdadmin_upload_1000771

Defect engineering for more reliable and efficient PbTe-based thermoelectric materials

Description:: Thermoelectric devices utilize semiconducting n-type and p-type thermoelectric materials to convert heat into electricity. Despite their promise for deep space power generation or waste heat recovery, most high-performing thermoelectric materials reported in literature are absent in practical applications - partially due to inconsistent synthesis and poor mechanical performance. This work...
Keyword:: Thermoelectrics, Doping, Phase Equilibrium, Defects, Mechanical Properties, and Semiconductors
Subject:: Physical chemistry, Materials Science, and Energy
Creator:: Male, James Patrick
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 06/22/2022
Date Created:: 2022-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_879755 and http://dissertations.umi.com/northwestern:15943

Plasmon-Enhanced Light-Matter Interaction in Hybrid Nanostructures

Description:: Plasmonic nanoparticles have very large absorption cross sections and can concentrate the local density of photon states on the nano scale. When they are coupled to molecules or semiconductor nanocrystals and form different hybrid nanostructures, various light-matter interaction processes can be significantly enhanced or manipulated, including optical responses like fluorescence...
Keyword:: plasmon, nanostructures, and surface-enhanced Raman spectroscopy
Subject:: Physical chemistry and Materials Science
Creator:: Wu, Yue
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/02/2022
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: http://dissertations.umi.com/northwestern:15861 and etdadmin_upload_862992

Effects of Inorganic Composition and Organic Ligands on Spin, Charge, and Thermal Transport Properties of Semiconductor Nanocrystals

Description:: Semiconductor nanocrystals possess unique photophysical properties that make them desirable for many optoelectronic applications such as photovoltaics, LEDs, and quantum computing. When the size of a semiconductor is reduced to below the excitonic Bohr radius of the material, its carriers becomes quantum confined resulting in drastic changes to optical, electronic,...
Keyword:: Nanocrystals, Spin, Semiconductors, Spectroscopy, Thermal properties, and Carrier Dynamics
Subject:: Physical chemistry, Chemistry, and Materials Science
Creator:: Harvey, Samantha
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/02/2022
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_857543 and http://dissertations.umi.com/northwestern:15830

Control of Light-Induced Electronic Behavior at Interfaces of Hybrid Nanomaterials

Description:: This dissertation explores ways to utilize physical parameters at the nanoscale interface to control the properties of mixed-dimensional heterojunctions (MDHJs). MDHJs combine the desirable properties of different classes of low-dimensional nanomaterials (materials that are quantum confined in at least one dimension). While MDHJs have achieved superlative performance for a variety...
Keyword:: photophysics, mixed-dimensional, low-dimensional, time-resolved spectroscopy, and nanomaterials
Subject:: Physical chemistry, Nanoscience, and Materials Science
Creator:: Padgaonkar, Suyog
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 10/07/2021
Date Created:: 2021-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_827806 and http://dissertations.umi.com/northwestern:15611

Impact of Solar Cell Processing Conditions on Active Layer Morphology and Charge Generation Dynamics in Organic Solar Cells

Description:: Increasing industrialization and the resulting negative environmental impacts highlight the need to develop alternative renewable energy sources. The Sun is a massive source and organic solar cells are a growing field of study. As new materials are synthesized, the efficiencies of organic solar cells continue to grow, but without an...
Keyword:: x-ray scattering, transient absorption, and organic solar cell
Subject:: Physical chemistry, Chemistry, and Materials Science
Creator:: Lou, Sylvia Jen-Ming
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_626768 and http://dissertations.umi.com/northwestern:14458

Modulation of the Redox Activity of Colloidal Quantum Dots by Tuning Nanoscale Electrostatic Interactions

Description:: This thesis describes a series of fundamental studies that address the role of electrostatic interactions in modulating i) the permeability of the ligand shell of a colloidal quantum dot (QD) to an anionic redox probe; ii) the resulting yield of photoinduced electron exchange within the QD ‒ redox probe complex;...
Keyword:: electrostatic interactions, surface chemistry, quantum dots, and optical spectroscopy
Subject:: Physical chemistry, Nanoscience, and Materials Science
Creator:: He, Chen
Owner:: Scholarly Digital Publishing
Language:: en
Date Uploaded:: 02/12/2020
Date Created:: 2018-01-01
Resource Type:: Dissertation
Alternate Identifier:: etdadmin_upload_613994 and http://dissertations.umi.com/northwestern:14389

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Non-Equilibrium Structural and Electronic Dynamics in Perovskite Semiconductors

Electrostatic Mechanisms for Shape Selection in Charged Chiral Molecular Assemblies

Defect engineering for more reliable and efficient PbTe-based thermoelectric materials

Plasmon-Enhanced Light-Matter Interaction in Hybrid Nanostructures

Effects of Inorganic Composition and Organic Ligands on Spin, Charge, and Thermal Transport Properties of Semiconductor Nanocrystals

Control of Light-Induced Electronic Behavior at Interfaces of Hybrid Nanomaterials

Impact of Solar Cell Processing Conditions on Active Layer Morphology and Charge Generation Dynamics in Organic Solar Cells

Modulation of the Redox Activity of Colloidal Quantum Dots by Tuning Nanoscale Electrostatic Interactions

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