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Showing 1 to 16 of 16 for “"Defect clusters"”.
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Stoichiometry dependence of the evolution of the irradiated-induced defect clusters in lanthanum-doped ceria
Item marked as restricted to the 'UIUC Users [automated]' Group (id=2) by William Ingram (wingram2@illinois.edu) on 2012-02-01T00:50:39Z Item is restricted until 2014-02-01T00:50:07Z
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Hydrogen effects on the point defect spectrum in Fe-C alloys
… the stability and concentrations of the point defect clusters present in metastable Fe-C-H alloys with vacancies. The defect spectrum is found to be strongly dependent on the local vacancy concentration, and for low hydrogen levels sharp highly non-linear changes in the defect cluster …
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Generic Influences of Charged Defects on the Structure-Property Relationships of Modified Ferroelectric Barium Titanate and Antiferroelectric Sodium Niobate
… two-dimensional cellular automaton model of defect distribution was proposed based on space charge neutrality considerations. It used only pairwise nearest-neighbor interactions and neglected the elastic effects associated with lattice distortions. Simulations demonstrated a general …
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Block copolymer self-assembly - a computational approach towards novel morphologies
… post template to study system resilience towards defect creation. Template shear-like distortion seemed to govern local defect generation. Defect clusters with symmetries compatible with that of the BCP showed enhanced stability.
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Surface and bulk passivation of multicrystalline silicon solar cells by silicon nitride (H) layer : modeling and experiments
… and experimental studies on the influence of defect clusters on the performance of me-Si solar. cell have been performed. In a typical cell, the defect clusters produce an efficiency loss of 3 to 4 percent.
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The effect of point defects in copper on the anomalous transmission of X-rays
… calculated displacements associated with these defects, indicates that the interstitial is not in the split (100) configuration. Possible configurations are the body centered interstitial or the split (111) interstitial. Measurements after annealing at BOoK and 3000K were made. The measurements …
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Impact of cellular dislocation structures produced by additive manufacturing on neutron irradiation damage evolution in stainless steel 316L
… for the effect of pre-existing defects on radiation damage accumulation. The evolution of synthetically generated dislocations in a Fe-Cr-Ni system in response to multiple radiation collision cascades suggest that dislocation dense regions reduce the probability of surviving …
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Radiation Effects on Thermal Properties of Advanced Nuclear Materials
… low-fluence neutron irradiation induced complex defect clusters that degraded thermal diffusivity, while the crystallographic lattice parameters, vibrational energy states (inferred from thermal expansion measurements), and heat capacity exhibited an inconclusive response to radiation damage. To …
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Positron annihilation spectroscopy to understand defect formation and evolution in neutron-irradiated Fe-Cr model alloys
… technique used to characterize the defect properties of materials. There are two major types of PAS, positron annihilation lifetime spectroscopy and Doppler broadening spectroscopy (DBS). This work focused on the latter. DBS can be used to gain information on the various types of …
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Tracking and Exploiting Charge Carrier Movement and Photochemical Processes in Light-Harvesting Energy Materials
… techniques are utilised to show that nanoscale defect clusters, which are associated with phase impurities, are sites at which material degradation seeds. The trapping of charge carriers at sites associated with phase impurities, itself reducing performance, catalyses redox reactions that …
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Characterisation of radiation effects in ultra-thin GaAs solar cells for space applications
… constants and appearance of radiation-induced defects in cathodoluminescence intensity maps. These trends are indicative of the variation in defect type with radiation type and suggest that the presence and size of defect clusters has a significant effect on the electrical behaviour of …
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First principles-based atomistic modeling of the structural properties of silicon-oxide nanomaterials
… and structure of self-interstitial and vacancy clusters in silicon and the effect of strain on the structure and stability of the defect clusters. Our work for vacancy clusters suggests that small vacancy defects exclusively favor fourfold-coordination thermodynamically with no significant …
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Modeling rough energy landscapes in defected condensed matter
… and theoretical investigation of the behavior of defected condensed matter and its evolution over long time scales. The thesis provides original contributions to the methodology used for simulating the slow evolution of complex condensed matter, as well as applications to three problems: hydrogen …
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Fission gas transport and its interactions with irradiation-induced defects in lanthanum doped ceria
… fundamental mechanisms of irradiation-induced defect formation and evolution in nuclear fuel, similar combined modeling and experimental efforts have been carried out. Ceria (CeO2) was selected as a surrogate material for Uranium Dioxide (UO2) due to its many similar properties. Lanthanum (La) …
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Modeling, design and fabrication of thin-film microcrystalline silicon solar cells
… using low cost uc-Si. This model divides the defect regions inside the material into different categories according to the defect levels in them. Therefore, this model is able to deal with various kinds of defects and defect clusters. The software uses finite element method to solve …
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Optical characterization of copper indium gallium diselenide thin films
… tolerance to off-stoichiometry and intrinsic defects. Film conductivity and recombination losses are controlled by intrinsic point defect concentrations, especially in the near-surface space-charge region of the heterojunction. Despite the amount of research already performed on CIGS alloys, …