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Showing 1 to 20 of 30 for “"Lead halide perovskite"”.
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Quantum-confined Inorganic-organic Lead Halide Perovskite
Inorganic-organic hybrid perovskites have been regarded as one of the most distinctive next-generation luminescence materials due to their advanced properties. This thesis describes our study of confining inorganic-organic hybrid perovskites with nanoporous gallium nitride (GaN) matrix and with …
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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 …
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Stability study in lead-halide perovskite light-emitting diodes
The metal halide perovskite group of materials not only have led to great advances in photovoltaics, but also have shown great potential in light emitting applications. Other than energy efficiency and brightness, perovskite emitters have advantages such as high colour saturation and low processing …
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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 …
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Charge Carrier Balance in Lead Halide Perovskite Light Emitting Diodes
… and simulations to study the charge balance in Lead Halide Perovskite (LHP) emitter LEDs. These LHP LEDs, particularly Near-Infrared Emitters have demonstrated high EQE, and promising lifetime.However for many other emission wavelengths their performance and endurance is lacking. I first present …
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Accelerated Lead Halide Perovskite Development by Autonomous Robotic Experimentation in Flow.
North Carolina State University Theses Chemical Engineering.
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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 …
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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 …
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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 …
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First-principles studies of defects in colloidal nanocrystals
… prices. They include hybrid organic-inorganic lead halide perovskite PV, organic PV and colloidal quantum dot (CQD) PV. Colloidal quantum dots are semiconducting nanocrystals that exhibit size tunable electronic and optical properties.
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Spectroscopy and rational chemical design of single emitters for quantum photonics
… and singlephoton emission purity of single lead halide perovskite quantum dots (PQDs) in dilute solutions using photon-correlation spectroscopy. I identify PQD's unique minimal inhomogeneous broadening and remarkable tunability of the biexciton Auger recombination rate. Mechanisms for the …
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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 …
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Investigating photophysics in colloidal semiconductor quantum dots through photon-correlation methods
… understanding of the exciton dynamics in cesium lead halide and CdSe/CdS quantum dots. In the first two chapters, I will build a foundation on the understanding of semiconductor quantum dots, quantum emitters, and single particle spectroscopic techniques. In the next two chapters, I will use …
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Design and Development of 2d Functional Semiconductor Nanocrystals
… up approach, and two for all-inorganic cesium lead halide perovskite NPLs and nanosheets (NSs), with one by the post-synthetic solvothermal treatment of perovskite nanorods (NRs) and one by a ligand-mediated room temperature synthesis. Additionally, Mn2+-dopant incorporation methods were …
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Applications of spectral management in optoelectronic devices
… limited by the types of crystals used. Cesium lead halide perovskite nanocrystals exhibit photoluminescence quantum efficiencies approaching 100%. However, due to the large surface areas and anion mobility halogen exchange between perovskite nanocrystals of different compositions occurs …
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Probing Coherent States and Nonlinear Properties in Multifunctional Material Systems
… (PZT), InAs/AlAsSb multi-quantum-well [3], lead halide perovskite [4], n-type InAsP films [5, 6], and nanolaminate plasmonic crystals [7]. Probing multiferroics, which are materials that can exhibit ferromagnetic, ferroelectric, and ferroelastic orders simultaneously in a single phase, was a …
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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 …
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Optical hot carrier solar cell: A general method of spectrum management in photovoltaics
… explored hot carrier absorber candidates in the lead-halide perovskite family (APbX3) using ultrafast optical characterization and first-principle calculations. A stronger phonon bottleneck effect was shown in hybrid perovskites than in their inorganic counterparts to prolong the carrier cooling …
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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 …
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