Browsing by Author "Lonergan, Mark"

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Computational Studies of Environmentally Important Processes at Aqueous Interfaces

Shamay, Shachar (University of Oregon, 2012)

Undoubtedly, water is the most abundant and important molecular liquid and is likely the most necessary for life on Earth. The pursuit of understanding water's properties and behaviors has placed it in a unique scientific ...
Controlling the Synthesis of Bunte Salt Stabilized Gold Nanoparticles Using a Microreactor Platform in Concert with Small Angle X-ray Scattering Analysis

Haben, Patrick (University of Oregon, 2013-10-10)

Gold nanoparticles (AuNPs) have garnered considerable attention for their interesting size-dependent properties. These properties have fueled applications that span a continuum ranging from simple to sophisticated. ...
Cycloparaphenylenes as Building Blocks for Self-Assembled Nanotube-like Structures

Leonhardt, Erik (University of Oregon, 2020-09-24)

Since its first synthesis in 2008, the cycloparaphenylene (CPP), or “carbon nanohoop”, has quickly evolved from a synthetic novelty to a readily accessible and highly tunable molecular scaffold. With accessibility no ...
Design, Synthesis, and Characterization of Ionically Functionalized Conjugated Polymers with Varying Ion Density and Type

Stay, David (University of Oregon, 2012)

Phenylene-based conjugated polymers are of interest for their fascinating electronic and optical properties. The introduction of bound ions into these materials adds great versatility because it can affect solubility, ...
Development of Multifunctional Gold Nanoparticle Reagents and Applied Use as Metal Ion Sensors, Drug Platforms, and Bioprobes

Kennedy, Zachary (University of Oregon, 2015-08-18)

Gold nanoparticles are a class of materials expected to have a large impact in future biomedical and environmental applications due to their size-dependent core properties and ease of functionalization. Surface coatings, ...
Fundamentals and Industrial Applications: Understanding First Row Transition Metal (Oxy)Hydroxides as Oxygen Evolution Reaction Catalysts

Stevens, Michaela (University of Oregon, 2017-09-06)

Intermittent renewable energy sources, such as solar and wind, will only be viable if the electrical energy can be stored efficiently. It is possible to store electrical energy cleanly by splitting the water into oxygen ...
Heterojunction-Assisted Impact Ionization and Other Free Carrier Dynamics in Si, ZnS/Si, and ZnSe/Si

Meitzner, Karl (University of Oregon, 2015-08-18)

With increasing global energy demand and diminishing fossil fuel supplies, the development of clean and affordable renewable energy technology is more important than ever. Photovoltaic devices harvest the sun’s energy to ...
Impact of Ligand Shell Architecture on Structure and Reactivity of DNA Aptamer-Linked Gold Nanoparticle Assemblies

Baldock, Brandi (University of Oregon, 2016-10-27)

DNA-functionalized gold nanoparticles (DNA-NPs) have enormous potential as building blocks for materials due to their ability to specifically recognize and respond to target molecules and surfaces. The ability of DNA ...
Quantification of Point Defect Energy in MDACl2-Stabilized Perovskite Solar Cells

Wales, Nicole; Crawford, Zack; Lonergan, Mark (University of Oregon, 2020)

Perovskite solar cell efficiency is reduced by Shockley-Read-Hall (SRH) recombination, in which charge carrier collection is diminished by the presence of sub-band gap energy states, called traps. Theoretical studies have ...
Solar Cell Contacts: Quantifying the Impact of Interfacial Layers on Charge Transfer, Selectivity, Recombination, and Open-Circuit Voltage

Egelhofer Ruegger, Kira (University of Oregon, 2020-12-08)

Solar cells require two primary components to function: an absorber and contacts, either of which may limit photovoltaic efficiency. For example, the contacts of silicon and perovskite solar cells limit their performance. ...
Surface Potential Sensing Atomic Force Microscopy to Probe the Role of Oxygen Evolution Catalysts When Paired with Metal-Oxide Semiconductors

Nellist, Michael (University of Oregon, 2019-01-11)

While prices of solar energy are becoming cost competitive with traditional fossil fuel resources, large scale deployment of solar energy has been limited by the inability to store excess electrical energy efficiently. One ...
Synthesis, Characterization and Properties of [(SnSe)1+δ]m(MoSe2)n and New Rare Earth (LaSe1-x)1.17(VSe2-y)n (n = 2-4) and [(EuSe)1+δ]1(VSe2)n (n = 1-3) Ferecrystal Systems

Gunning, Noel (University of Oregon, 2015-08-18)

Solid state synthesis of layered, rotationally disordered intergrowths consisting of rock salt (MX) and hexagonal (TX2) constituents in various sequences [(MX)1+δ]m[TX2]n is carried out by developing structural and ...
Synthesizing New [(SnSe)1.15]m(TSe2)n, [(SnSe)1.16]m(VSe2)n[(SnSe)1.16]p(TaSe2)q, and (SnSe)1.16(V.51Ta.49Se2) Intergrowth Compounds (T = V and Ta)

Atkins, Ryan (University of Oregon, 2013-10-03)

A modification of the modulated elemental reactants synthetic technique was developed and used to synthesize several new layered compounds. Several TSe2, [(SnSe)1+y]m(TSe2)n, [(SnSe)1+y]m(TSe2)n[(SnSe)1+y]p(T'Se2)q, and ...
The Defect Structure and Performance of Methylammonium Lead Trihalide Thin-film Based Photovoltaics

Miller, David (University of Oregon, 2017-09-06)

In order to limit global warming to 1.5-2 °C deployed solar photovoltaic (PV) power must increase from today's 0.228 terawatts to 2-10 terawatts installed by 2030, depending on demand. These goals require increasing ...
The Oxidative Addition of Palladium(0) to Hydro- and Halo- Silanes: Mechanisms and Applications

Hurst, Michael (University of Oregon, 2022-05-10)

The activation of silanes by transition metals is a crucial step in many transformations, including hydrosilylation, cross-coupling, and carbene insertion. Palladium is a common metal in catalysis and its activity is usually ...
Theory of Contact-limited Solar Cells

Roe, Ellis (University of Oregon, 2020-02-27)

The International Panel on Climate Change has made it clear that drastic action is required in order to prevent warming of global average temperatures from reaching 1.5-2.0 °C above the pre-industrial average. If this is ...
Transition Metal Oxides for Solar Water Splitting Devices

Smith, Adam (University of Oregon, 2016-02-23)

Although the terrestrial flux of solar energy is enough to support human endeavors, storage of solar energy remains a significant challenge to large-scale implementation of solar energy production. One route to energy ...
Understanding Charge Transport and Selectivitiy in Ionically Functionalized Fullerenes for Electron-Selective Interfacial Layers

Bradley, Colin (University of Oregon, 2018-04-10)

Significant improvements in power conversion efficiency (>10%) of emerging thin-film photovoltaics have been achieved in the last 5 years. High efficiencies would not be possible without the development of new selective ...