Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 27 for “"lead halide perovskites"”.
-
Microscale Energy Transport in Lead Halide Perovskites
… operation and design of semiconductor devices. Lead halide perovskites, an emerging semiconductor for optoelectronic applications, exhibits significant phenomena that can enhance or disrupt lateral energy transport, such as photon recycling and microscale heterogeneity. Understanding and …
-
The effect of atmosphere on lead halide perovskites
Metal halide perovskites are exciting materials for low-cost optoelectronic devices such as solar cells and LEDs. At present, perovskite materials still suffer from substantial non-radiative decay, particularly under solar illumination conditions, and are therefore yet to reach their full …
-
Charge Carrier Dynamics of Lead Halide Perovskites Probed with Ultrafast Spectroscopy
… relaxation and recombination in a range of lead halide perovskites. We focus on understanding whether the photophysical behaviour of these perovskite materials is like that of highly-ordered inorganic crystalline semiconductors (exhibiting ballistic charge transport) or disordered molecular …
-
Next generation optoelectronic devices for energy applications utilising metal oxides, bismuth oxyhalides and lead halide perovskites
Lead-halide perovskites (LHP) have rapidly emerged as a contender for commercial photovoltaic applications. Among its many advantages, one of the most important is that LHPs can be paired with silicon solar cells, which currently dominate the photovoltaics market. This is because LHP absorb in the …
-
Data-driven approach to understanding exciton-exciton interactions in CsPbBr₃ nanocrystals
Lead halide perovskites are a rapidly developing class of materials of interest for optoelectronic applications. They have a number of desirable properties such as long carrier diffusion lengths and defect tolerance that arise from the materials' unique dielectric properties. Although much of the …
-
Development of colloidal quantum dot and lead halide perovskite light emitting devices
… molecules, colloidal quantum dots (QDs) and lead halide perovskites, have emerged as top candidates for light emitting materials. One key feature of these materials is their bandgap tunability, e.g. via size or chemical composition, allowing for their emission color to be turned throughout …
-
Halide Perovskite and Perovskite-Inspired Light Emitters: Synthesis and Optical Spectroscopy
… measures are necessary to achieve this goal. Lead halide perovskites have in the past decade shown themselves to be a promising, novel solar cell technology, with efficiencies beyond 25 %. Lead halide perovskites cannot only harvest but also emit light very efficiently and could thereby …
-
Exciton Dynamics and Optical Properties of Lead Halide Perovskite Nanocrystals: From Nanorods to Nanocubes
Lead halide perovskites, particularly CsPbBr3, have emerged as leading light emitters for their spectral purity, brightness, and facile synthesis. Their soft, ionic lattice makes them unusually defect tolerant but introduces problems with stability. Additionally, dephasing mechanisms and coupling …
-
Self-assembly of lead-halide-perovskite laser particles
… of samples. In the thesis, I investigated lead halide perovskites (LHP) as a novel material for scalable production of laser particles in a lab flask. I discovered a sonochemical method to produce a large quantity (10 billions/L) of high-quality LHP micro- and sub-micron particles in a …
-
Exploring the Structural and Optical Response of Halide Perovskites Using High-Energy Electrons
… composition, and optoelectronic structure of halide perovskites, a promising candidate for next-generation optoelectronic materials, using high-energy electron-beam microscopy techniques. This work addresses the stability challenge of PSCs from a material science perspective by understanding …
-
Coherence, Dephasing, and Quantum Interference in Colloidal Perovskite Nanocrystals
… quantum technologies. Recently, colloidal cesium lead bromide perovskite nanocrystals have garnered interest for their potential use as quantum emitters. As a novel emitter, there is a prominent need for further characterization of perovskite nanocrystals, not only to learn more about the …
-
Benchmarking the Performance of Bayesian Optimization across Multiple Experimental Materials Science Domains
… nanotube polymer blends, silver nanoparticles, lead-halide perovskites, as well as additively manufactured polymer structures and shapes. By defining acceleration and enhancement performance metrics as general materials optimization objectives, we find that for surrogate model selection, …
-
Charge Carrier Relaxation in Halide Perovskite Semiconductors for Optoelectronic Applications
Lead halide perovskites have shown remarkable device performance in both solar cells and LEDs. Whilst the research efforts so far have been mainly focussed on device optimisation, little is known about the photophysical properties. For example, the nature of the bandgap is still debated and an …
-
Magneto-Optical Effects in Manganese-doped Lead Halide Perovskite
… over exciton-dopant interactions. Hybrid metal-halide perovskites are a new class of high-performance solution-processable semiconductors which combine remarkable optoelectronic performance with tolerance to structural defects and impurities. This thesis demonstrates magnetic doping of lead …
-
Properties and Processing of Chalcogenide Perovskites
… promising optoelectronic materials, such as lead halides perovskites, have shown remarkable strides in optoelectronic performance, but they are plagued with issues of toxicity and stability. Chalcogenide perovskites have been proposed as potential replacements for these lead halide …
-
High-throughput Bandgap Mapping for Perovskite-inspired Materials
In recent years, lead halide perovskites have gained attention as promising candidates for photovoltaic devices due to their superior performance. However, issues with stability and toxicity have hindered their widespread application. As a result, perovskite-inspired materials, which are stable and …
-
Defects and charge-carrier lifetime in early-stage photovoltaic materials : relating experiment to theory
… is explored by intentionally contaminating lead halide perovskites with iron. Synchrotron-based X-ray techniques are also utilized to investigate the distribution and charge state of incorporated iron, and perovskite solar cells are found to tolerate approximately 100 times more iron in the …
-
Synthesis and Characterization of Chalcogenide Perovskites
Chalcogenide perovskites are both an old and new group of materials. First synthesized in 1957, chalcogenide perovskites are generally sulfur and selenium compounds which contain a 3D network of corner-sharing octahedra. Not until 2015 was this material class recognized as being suitable for any …
-
Single-step, Atmospheric Pressure Chemical Vapor Deposition of Methylammonium Bismuth Iodide Thin Films
<p>Lead halide perovskites (CH<sub>3</sub>NH<sub>3</sub>PbI<sub>3</sub> and its variants) are promising solar cell absorber materials. Though the reported power conversion efficiencies of lead halide perovskite solar cells (up to 21%) are competitive with commercial silicon solar cells, lead …
-
Developing microwave probes for investigating opto-electronic processes in photovoltaic materials
… carrier mobilities and lifetimes of CH3NH3PbI3 lead halide perovskite thin films using TRMC. The spectrally resolved TRMC apparatus enabled the investigation of charge decay dynamics at a range of excitation energies, mimicking the solar spectrum. We differentiate between direct and …
Page 1 of 2