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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 451 for “"perovskite"”.
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Halide Perovskite and Perovskite-Inspired Light Emitters: Synthesis and Optical Spectroscopy
… 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 increase the …
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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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Scalable Perovskite Thin-Film Photovoltaics
In recent years lead halide based thin-film perovskites have emerged as a promising direct bandgap semiconductor for light absorption and emission applications. This is in part due to their compositional tunability and potential alloying that allows their color to be tuned from the near-IR through …
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Multisource Evaporation of Perovskite Solar Cells
… emerging semiconductor family of metal-halide perovskites for their application in solar cells. Halide perovskite materials have shown several promising properties, such as high absorption coefficient, low exciton binding energy, high charge mobility, long diffusion length and low annealing …
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Anion manipulation in perovskite-related materials
Sr\(_2\)Co\(_2\)O\(_5\) with the perovskite-related brownmillerite structure has been synthesised via quenching, with the orthorhombic unit cell parameters \(a\) = 5.4639(3) Å, \(b\) = 15.6486(8) Å and \(c\) = 5.5667(3) Å based on refinement of NPD data collected at 4K. Electron microscopy revealed …
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Patterning Tri-Halide Perovskite Single Crystal Growth
Organic perovskites have been growing in the field of organic electronics, and lately field-effect transistors with single-crystalline perovskites have received more attention, because they should have ideal field-effect mobility and new crystal growth techniques have made them easier to …
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Deposition and characterisation of perovskite thin films
… depo-sition and characterisation of halide doped perovskite thin films.Films of methylammonium lead iodide CH3NH3PbI3 were dopedwith Cl and Br ions to investigate the intrinsic differences of theseperovskites. As a result of doping, photoluminescence (PL) spectraconfirmed optoelectronic influence …
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Perovskite Light-emitting Diodes with Tunable Emission
… flexibility of various size and shape. Halide perovskite has tunable colour emission, low disorder and is solution processable making it one of a popular choice as emitters. This thesis demonstrates the versatility of using halide perovskite material in light-emitting diodes. We demonstrate the …
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Crystallization of Perovskite Lead Titanate From Glasses
Made available in DSpace on 2014-12-05T22:57:03Z (GMT). No. of bitstreams: 1 6104258.pdf: 4213528 bytes, checksum: 4c3b043dbd4e1f03b7af827947249810 (MD5) Previous issue date: 1961
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Device physics of perovskite light-emitting diodes
Metal halide perovskites have emerged as next-generation semiconductors for light emission, owing to their bright luminescence, excellent charge-transport properties, ease of processing and tunable bandgap. In less than a decade, the external quantum efficiency of perovskite light-emitting diodes …
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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
… In the past decade, a new type of semiconductor, perovskite, has shown extraordinary photophysical properties; their low-dimensional counterpart, all-inorganic perovskite nanocrystals (CsPbBr₃ NCs), has since shown promising performances in optoelectronic devices. However, their fundamental …
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Vapor Transport Deposition for Perovskite Solar Cells
As perovskite solar cells move closer to commercialization, vapor transport deposition (VTD) has emerged as one of the potential routes for large-scale film growth of photoactive and charge transport layers for these solar cells. As a low-cost alternative to thermal evaporation, VTD has the …
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Electroluminescence characterization of organometallic perovskite solar cells
… (PV) devices based on "Organometallic Perovskites" which exhibit high power conversion efficiencies of approximately 23%. Aside from single-junction current-voltage characteristics, these devices exhibit low voltage light emitting diode (LED) operation with thermally activated …
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Interface engineering and multi-modal characterization of co-evaporated metal halide perovskite films for efficient perovskite-silicon tandem solar cells
… and scalable renewable energy technologies. Perovskite–silicon tandem solar cells (PSTs) have recently reached certified efficiencies of 34.9%, surpassing the single-junction efficiency limit and underscoring their industrial potential. To enable large-scale deployment, up-scalable deposition …
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PEROVSKITE PHOTOCATALYSTS FOR THE DECOMPOSITION OF ODOR MOLECULES
… a range of advanced, innovative SrTiO3 (STO) perovskite materials were synthesized and analyzed. The high thermal stability of STO makes it ideal for applications that involve high surface thermal treatments, such as in the ceramic industry. In such applications, TiO2 needs to be replaced with …
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Structures and relationships of some Perovskite-type compounds
"A model for crystallographic transitions in perovskites is proposed. The model consists of regular octahedra sharing corners and topologically able to rotate without distortion around their three-fold axes. This model, with R3̄c symmetry (18e position) can be described in terms of a continuous …
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Electron Microscopy Studies of Hybrid Perovskite Solar Cells
… five years hybrid organic-inorganic metal halide perovskites have attracted strong interest in the solar cell community as a result of their high power conversion efficiency and the solid opportunity to realise a low-cost as well as industry-scalable technology. Nevertheless, several aspects of this …
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Luminescent nanofluids based on perovskite materials and nanodiamonds
… proposed for biomedical applications, perovskite (ABX3) quantum dots (QDs) and nanodiamonds stand out. However, the emission wavelength of perovskite QDs typically lies within the visible range, and the potential for using nitrogen-vacancy (NV-) and silicon-vacancy (SiV-) centres in …
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Role of point defects in Perovskite microwave resonators
Perovskite ceramics are used in a plethora of applications, including electroceramics, superconductors, semiconductors, refractories, catalysts, magnetoresistors, proton conductors, and substrates for semiconductor heteroepitaxy. Engineering defective structures in an attempt to modify properties …
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