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Showing 1 to 18 of 18 for “"Perovskite Nanocrystals"”.
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Carrier Dynamics in Perovskite Nanocrystals
In this thesis, we describe our work discovering perovskite nanocrystals with desirable optoelectronic properties for high-efficiency solar cells. Ultrafast carrier-phonon interactions in semiconductors represent a major loss of the excess energy of photoexcitations above the bandgap. We …
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All Inorganic Colloidal Perovskite Nanocrystals for Optoelectronic Applications
… of colloidal all-inorganic metal-halide perovskite nanocrystals (CsPbX3 NCs, where X=Br or I). These types of materials have shown promising performance in applications including photovoltaics (PVs) and light-emitting diodes (LEDs) due to their excellent optoelectronic properties, such as …
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Coherence, Dephasing, and Quantum Interference in Colloidal Perovskite Nanocrystals
… 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 fundamental …
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On-Site Synthesis of Halide Perovskite Nanocrystals with Sub-50 nm Positional Accuracy
Metal halide perovskites comprise a promising class of semiconductors with broad applications ranging from optoelectronics and photovoltaics to photocatalysis. To extend these applications to on-chip devices, on-site growth of perovskite nanocrystals with high positional accuracy must be achieved. …
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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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Design of Flow Reactors for the Continuous Synthesis of Nanoparticles
… the syntheses of gold nanoparticles (Au NPs) and perovskite nanocrystals with controlled sizes in a continuous manner, combining kinetics study and reaction engineering approaches as well as computational fluid dynamics (CFD). Firstly, the mechanism of the Turkevich protocol, the recommended …
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Perovskite interfaces with protective zinc compounds – DFT computation and related experiments
Perovskite nanocrystals exhibit excellent PLQY close to unity. However, they degrade rapidly upon environmental exposure without a protective coating. Many studies have focused on core-shell structural strategies to enhance their stability, but the interfacial interactions between soft perovskite …
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Applications of spectral management in optoelectronic devices
… 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 rapidly, limiting …
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Exciton and Energy Transfer Dynamics in Hybrid Perovskite and Lanthanide Nanomaterials
A new class of semiconductors, halide perovskites have stood out from other semiconductors due to their tunable emission properties, ease of fabrication and device integration. Some perovskite nanostructures, e.g. self-assembled hybrid perovskite quantum wells (PQWs) and CsPbX3 nanoparticles, show …
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Ultrafast Investigations of Exciton Dynamics in 0D and 2D Hybrid Semiconductor Nanomaterials
… and neutralization processes in lead halide perovskite nanocrystals (quantum dots) with transient absorption spectroscopy. A temperature-dependent study of CsPbBr3 nanocrystals reveals that charging occurs in a significant fraction of photoexcited nanocrystals (>10%), which then exhibit a …
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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 …
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A hybrid approach towards on-chip visible lasers
… expanded to include organic molecules; colloidal nanocrystals such as quantum dots, quantum rods, and quantum wells or nanoplatelets; perovskite semiconductors; and perovskite nanocrystals. A key feature of these materials is the capability to engineer their energy levels, e.g., via chemical …
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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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Exciton Dynamics in Perovskite CsPbBr₃ Semiconductor Nanocrystals
Semiconductor nanocrystals, or quantum dots, have attracted much attention over the past three decades due to their potential applications in optoelectronic devices, such as displays, sensors, photovoltaics, and as single-photon sources. This class of materials differs from traditional bulk …
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Design and experimental observation of topological states in photonic metasurfaces
… via integration with active materials, e.g., perovskite nanocrystals, which we also demonstrated in our recent works. To study topological states which reside under the light cone I applied different experimental techniques, including a dark field microscopy for visualization of modes in the …
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Cs-Pb-Br Core-shell Perovskite Microcrystals for Stability Improvement
Lead halide perovskite nanocrystals (LHP NCs) have been developed since 2014. Due to their intrinsic ionic salts and lead-halogen composition, they have high molar absorbance coefficient, high defect tolerance, and ultra-fast carrier mobility, and their material structure and optical properties can …
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Bioinspired, perovskite-based, wavelength-resolved UV-visible imaging sensors
Submission original under an indefinite embargo labeled 'Open Access'. The submission was exported from vireo on 2024-03-01 without embargo terms
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Perovskite-nanocrystal-enhanced vertically stacked photodiode image sensor for wavelength-resolved UV imaging
Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2027-08-01