Browsing Physics (Theses and Dissertations) by Title
Now showing items 27-46 of 417
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Carbon Nanomaterials for Improved Performance of Perovskite Solar Cells Processed under High Humidity
(Trinity College Dublin. School of Physics. Discipline of Physics, 2019)The work documented in this thesis concerns optimization of stacks of semiconducting materials for photovoltaic purposes. Hybrid organic-inorganic metal halide perovskite (MHP) is a promising semiconducting material for ... -
Cerium dioxide redox cycle for fuel production
(Trinity College (Dublin, Ireland). School of Physics, 2015)The following thesis covers a number of topics related to thermochemical fuel production using the CeO2 redox cycle. Chapter 1 gives an introduction to the topic, providing motivation, historical development and the main ... -
Characterisation and Manipulation of Transition Metal Dichalcogenides via Atomic Force Microscopy
(Trinity College Dublin. School of Physics. Discipline of Physics, 2022)Scanning probe microscopy (SPM) has revolutionised nanotechnology and allowed the study and manipulation of materials at the nanoscale, making it ideal for the study of solid-state physics and semiconductor technologies. ... -
Characterisation of laser produced plasmas
(Trinity College (Dublin, Ireland). School of Physics, 2006)This thesis describes the apphcation of planar Langmuir probes in laser produced plasmas. The influence of the ion flow on the probe behaviour and its effect on the measured plasma parameters has been investigated for ... -
Characterisation of materials under thermal and electrical stimuli using in-situ electron microscopy and MEMS technology
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)Abstract To incorporate nanomaterials into functional devices we need to fully understand the materials characteristics. This includes electrical, optical, mechanical and most important for us the thermal properties. The ... -
Characterisation of SemiconductorLasers for use as a Pump Source for Microresonators
(Trinity College Dublin. School of Physics. Discipline of Physics, 2023)Optical frequency combs (OFCs) were first developed in the 1990s, initially as a means to count the cycles from atomic clocks. They have since proved very useful as a tool for metrology, sensing and frequency synthesis. ... -
Characterising Pulsars with Low-Frequency Software Telescopes
(Trinity College Dublin. School of Physics. Discipline of Physics, 2024)Pulsars are a class of rapidly rotating neutron stars that periodically provide detectable emission in the direction of the Earth, where it can be detected by telescopes across the electromagnetic spectrum. These husks of ... -
Characterization of single-mode laser and tunable laser array based on etched high order surface gratings
(Trinity College (Dublin, Ireland). School of Physics, 2015)Wavelength tunable single-mode semiconductor lasers play an essential role in modern optical communication systems. They are also rapidly replacing fixed-wavelength light sources in dense wavelength-division-multiplexing ... -
Characterization, Simulation and Optimization of Surface Etched Slotted Tunable Laser Diodes
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)The past decades have seen near exponential growth in internet traffic. To meet this growth, optical communication networks continue to branch deeper into network architectures, replacing electrical based communication. ... -
Charge and spin transport through organic semiconductors
(Trinity College (Dublin, Ireland). School of Physics, 2013)Over the past decade a great body of research has been devoted to the field of organic spintronics. This is primarily because of its potential to open new ways to cheap, low' weight, mechanically flexible, chemically inert ... -
Charging, doping and gating of a single dangling bond on a bare Si(100)-c(4x2) surface
(Trinity College (Dublin, Ireland). School of Physics, 2012)Despite the increasing interest in novel materials for the next generation of microelectronic devices, such as graphene and topological insulators, Si(100) surface is still the most important substrate for nano-device ... -
Comparative study of beam-induced carbonaceous deposits in helium-ion and scanning electron microscopes.
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018)In this work, the phenomena of beam-induced contamination in charged beam microscopes (i.e. the scanning electron microscope (SEM) and helium ion microscope (HIM)) was investigated in order to determine its influence on ... -
Compositional and Structural Characterisation of Polymer Photovoltaic Devices
Organic materials have enormous relevance in material science and have many advantages over materials such as metals, ceramics and glass due to their physical and mechanical properties. They offer a viable alternative to ... -
Computational and Experimental Study of Optical properties of TiO2 Arrays Fabricated via Soft Nanoimprint Lithography
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)In this thesis the optical properties of large 1 mm2 titanium oxide (TiO2) nanoarrays and the interactions with Rhodamine 6G are studied computationally and experimentally. Three TiO2 arrays with different particle size ... -
Computational design of usual magnetic tunnel junctions
(Trinity College Dublin. School of Physics. Discipline of Physics, 2018) -
Computational methods for electron transport and their application in nanodevices
(Trinity College (Dublin, Ireland). School of Physics, 2009)The present thesis deals with the development of theoretical and computational tools for the first principles study of ground state and electronic transport properties of nanoscale devices and the application of these tools ... -
Computational modelling of novel permanent magnetic designs
(Trinity College (Dublin, Ireland). School of Physics, 2005)Moderm permanent magnetic materials provide unique design opportunities as their low susceptibility makes them effectively transparent to external magnetic fields. This also simplifies the calculation of magnetic fields ... -
Computational studies of correlated 1D and 3D systems : a density functional theory approach
(Trinity College (Dublin, Ireland). School of Physics, 2011)This thesis describes a number of theoretical investigations into the electric and magnetic properties of one-dimensional and three-dimensional correlated systems. Our studies are based on suitable and efficient implementations ... -
Computational studies of the structure and dynamics of packings of grain and bubbles
(Trinity College (Dublin, Ireland). School of Physics, 2006)Since the dawn of civilization people have been intrigued by packing problems. They have a great significance in the practicalities of our everyday lives, with people always seeming to try to find more efficient ways of ... -
Connecting evolved massive stars to interacting supernovae
(Trinity College Dublin. School of Physics. Discipline of Physics, 2021)Massive stars and supernovae are not only remarkable objects on their own but they are closely related to many other topics in Astrophysics, such as nucleosynthesis, star formation, and gravitational waves. ...
