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Showing 1 to 8 of 8 for “"Double perovskite"”.
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Understanding and Controlling the Optoelectronic Properties of Cs2AgBiBr6 Double Perovskite
Halide double perovskites have gained significant attention, owing to their composition of low-toxicity elements, stability in air and long charge-carrier lifetimes. In particular, Cs2AgBiBr6 has been the subject of many investigations in photovoltaic devices. This thesis focuses on understanding …
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Stability of double perovskite cathodes under high humidity for solid oxide fuel cells
Solid Oxide Fuel Cells (SOFCs) can directly convert a wide variety of fuels to electricity efficiently. They can also be run in reverse as Solid Oxide Electrolysis Cells (SOECs) to produce hydrogen (and carbon-containing fuels) from electrolysis of water (and carbon dioxide). However, the kinetics …
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Estudo da dupla Perovskita La2MnFeO6 preparada por reação de estado sólido
… 24, 48 and 96 hrs. The obtained structures are double perovskite, monoclinic with space group P21/n and network parameters given by a = 5.52 ˚A, b = 5.51 ˚A and c = 7.81 ˚A. The sample crystallite sizes are equivalent to 361.0 nm (LFMO24), 348.9 nm (LFMO48) and 370.8 nm (LFMO96). According to …
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Enhanced High-Field Flux Pinning in YBa2Cu3O7-x Thin Films Through Engineering of Ba2YTaO6 Artificial Pinning Centres
… thesis investigates the effectiveness of the double perovskite material Ba2YTaO6 in enhancing the critical current density of YBa2Cu3O7 thin films grown by pulsed laser deposition. The first chapter of work investigates the structural and superconducting properties of commercial coated …
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Transient Photophysics of Bismuth Halide Semiconductors for Optoelectronic Applications
… properties. The materials investigated — the double perovskite Cs2AgBiBr6, bismuth iodide, and bismuth oxyiodide — have all been demonstrated in thin film photovoltaic devices fabricated at low temperatures. Propelled by the success of lead halide perovskites, this work forms part of the …
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Vapour-based growth of inorganic compounds for next-generation, stable photovoltaics
… methylammonium bismuth iodide and bismuth-based double perovskite structured compounds due to its relatively favourable bandgap (1.9 eV), small predicted electron and hole effective masses and large dielectric constant. Part A of the results and discussion section focuses on the growth, materials …
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Automated Bandgap Correction in Double Perovskites: An Active Learning Framework Using Hybrid Functional Density Functional Theory and Delta Machine Learning
… decision-making. This issue is relevant to oxide double-perovskites A2BB′O6, due to their significant chemical and structural diversity, making them very attractive for energy applications; however, their evaluation is also extremely difficult using low-cost electronic structure methods alone. …
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Single-crystal X-ray diffraction at extreme conditions in mineral physics and material sciences
… distribution of iron in Al-free, Fe3+-bearing Mg-perovskite (bridgmanite) was derived from single-crystal XRD combined with Mössbauer spectroscopy. We found that the compound has the composition (Mg0.946(17)Fe2+0.045(4)Fe3+0.011(1))Si0.997(16)O3. The important result from single-crystal XRD was …