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Showing 1 to 20 of 130 for “"Optoelectronic properties"”.
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Optoelectronic properties of size-selected silicon nanocrystals
… on various substrates. Layer growth, optical properties, charge transport, photoluminescence (PL) and electroluminescence (EL) were investigated on these porous layers. A stick-ball model for layer growth was developed and implemented by Monte-Carlo computer simulations. A limit value of 0.86 …
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Optoelectronic properties and energy transport processes in cylindrical J-aggregates
… predictions. The C8S3 J-aggregate photophysical properties are further explored, as the Stokes shift, quantum yield, and spectral line broadening are measured as a function of temperature from 77 – 298 K. The temperature-dependent emission ratios of the C8S3 J-aggregate two-band fluorescence …
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Theoretical studies of the optoelectronic properties of semiconductor quantum wells
The valence-band structure of a semiconductor quantum well is calculated based on the multiband effective-mass theory. A unitary transformation is found to diagonalize the six-by-six Luttinger-Kohn Hamiltonian into two three-by-three blocks, making the computation more efficient. With this new …
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Understanding and Controlling the Optoelectronic Properties of Cs2AgBiBr6 Double Perovskite
… focuses on understanding and controlling the optoelectronic properties of Cs2AgBiBr6 double perovskite thin films, focussing on three main areas: 1) understanding the role of grain boundaries on device performance, 2) lowering the bandgap through alloying with Sb3+, and 3) understanding the …
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Exploring Optoelectronic Properties of Twisted and Intercalated Niobium Oxide Dihalides
… as stacking, twisting and ion intercalation, properties such as electrical conductivity, spin diffusion length, thermal conductivity, and mechanical strength observe more degrees of freedom than in their bulk material counterpart. Currently, small optical systems comprise of passive devices …
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Au nanorods-semiconductor nanowire hybrid nanostructures : nanofabrication techniques and optoelectronic properties
… and theoretical investigation of the optical properties of Au nanorods, I design, nanofabricate and characterize Au nanorods-semiconductor nanowire hybrid nanodevices with novel optoelectronic capabilities compared to the non-hybrid counterpart. In this regards, I first discuss the …
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Atomistic investigation of morphology and optoelectronic properties of bismuth sulfide nonostructures
… nanoparticles from solution and tuning their optoelectronic properties through quantum confinement phenomena. A large number of applications have been reported in the field of solar cells, light-emitting diodes, lithium-ion batteries, thermoelectric devices, sensors, fuel cells and nonvolatile …
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Physical and optoelectronic properties of copper silver indium diselenide thin films
… characterization of the structural and optoelectronic properties of CuxAg1-xInSe2 alloy thin films in order to gain a better understanding of the material. Detailed physical characterization was carried out in order to reveal differences in the structural properties of the alloy as a …
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Interplay of optoelectronic properties and solar cell performance in multidimensional perovskites
… 22.7% efficiency to date. Despite its excellent properties such as defect tolerance and long carrier lifetime, the high-performing perovskite material, methylammonium lead iodide (MAPI), which has 3D structure, is still unstable. Recent studies have hinted at the possibility of shifting focus …
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Investigation of the Synthesis and Optoelectronic Properties of Ultrasmall CdSe Quantum Dots
… are compared to simulations of thermodynamic and optoelectronic properties of CdSe clusters conducted across a range of temperatures and dielectric constants.</p> <p>Finally, ultrasmall CdSe QDs were incorporated into metal oxide mesoporous structures, which served as the active material in …
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Control of optoelectronic properties via aliovalent disorder in ternary nitrides and oxynitrides
… of semiconductor compounds have revolutionized optoelectronics. From record-efficiency GaAs solar cells to the GaN-based light-emitting diodes that won the 2014 Nobel Prize, these compounds and alloys have enabled contemporary optoelectronic technology. However, there are challenges that cannot …
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Nanoscale optoelectronic properties in traditional and emerging materials for light-emitting diodes
Although InGaN/GaN-based quantum well (QW) heterostructures continue to set the industry standard for inorganic blue and green light emitting diodes (LEDs), these devices suffer from efficiency droop at high current densities and material quality degradation at longer emission wavelengths. …
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Influence of mixed phases on the optoelectronic properties of Cs-Pb-Br compounds
… the influence of phase mixture on the optical properties of Cs–Pb–Br compounds. This material system exhibits three ternary phases, CsPbBr3, Cs4PbBr6 and CsPb2Br5, which coexist in Cs–Pb–Br materials when deposited by various methods. The coexistence influences the light emission and by …
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Understanding and engineering electronic and optoelectronic properties of 2D materials and their interfaces
… These materials possess unique and exotic properties due to quantum confinement of importance to future electronics. However, many technical problems need to be solved to realize this goal. For example, as 2D material based devices become smaller down to the nanometer scale, the electrical …
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Femtosecond-laser irradiation as a platform for tailoring the optoelectronic properties of silicon
… multiple unique approaches to improving the optoelectronic properties of silicon, enabling both thin-film silicon photovoltaics and silicon-based IR photodetectors. In this thesis I study the structure-property-processing relationships related to the fs-laser irradiation of silicon in the …
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Nanostructured nitrogen and carbon codoped TiO2 thin films: synthesis, structural characterization and optoelectronic properties
TiO2 is widely used in applications like photocatalysis, sensors, solar cells, and memory devices because it is inexpensive, abundant, nontoxic and stable in aqueous solution. Another exciting application where TiO 2 has the potential to be a very useful catalyst is the clean hydrogen generation …
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Evaluation of the microstructural, electronic and optoelectronic properties of ƴ-CuCl thin films and their fabrication on Si substrates
… and characterized as a potential material for optoelectronic applications. Some of the samples were also oxygen plasma treated for durations of 1, 2 and 3 minutes, respectively. Room temperature x-ray diffraction (XRD) measurements show that CuCl grows preferentially in a (111) orientation …
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The Bio-Nano Interface: Investigating the Roles of Nanoparticle Morphology, Microstructure, Optoelectronic Properties, and Surface Chemistry for Biological Applications
… have highly tunable optical and electronic properties that depend on the nanocrystal size, shape, and composition. Because of these properties, QDs are potentially useful for applications such as LEDs, lasers, in-vivo and in-vitro imaging, and other sensing technologies. The work in this …
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Contact-free Electrical Characterisation of Novel Materials Using Terahertz Spectroscopy
… that allows the accurate measurement of the optoelectronic properties of semiconductor nanomaterials. The detrimental non-radiative pathways, either via surface states or oxidation or defects, that significantly degrades the optoelectronic properties of indium arsenide (InAs), indium arsenide …
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Iii-V Multiple Quantum Well Long-Wavelength Infrared Detectors
… provide information of III-V intersubband optoelectronic properties which are fundamental to the future sensitive, low-cost, large long wavelength infrared focal-plane arrays.
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