Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
Results
Showing 1 to 20 of 30 for “"defect tolerance"”.
-
Defect tolerance assessment of silicon nitride in rolling contact.
… on two relatively unexplored types of surface defects on silicon nitride balls – ‘star’ type defects and ‘missing material’. The main objective of this research is to determine failure modes and the critical or tolerable defect sizes for rolling bearing applications. This is achieved by means …
-
Physical redundancy for defect tolerance : example designs and fundamental limits
This project analyzes designs for physical redundancy which are modeled abstractly as a bipartite graph. The goal is to determine the characteristics of graph structures which optimize the trade-off between the number of edges and the number of redundant components or nodes needed while correcting …
-
Defect and fault tolerance techniques for nano-electronics
… will be accompanied by high manufacturing defect rates and high operation-time fault rates. This thesis is concerned with developing defect and fault tolerance techniques to address low manufacturing yield due to permanent defects and reduced computational reliability due to transient …
-
Correlating Structural and Opto-electrical Properties of Perovskite Solar Cells
… to be relatively large, suggesting a remarkable defect tolerance in perovskite films that needs to be understood in the context of the nature of the trap states and any residual non- radiative losses. These non-radiative losses are observed as photoluminescence heterogeneity within perovskite …
-
Data-driven approach to understanding exciton-exciton interactions in CsPbBr₃ nanocrystals
… such as long carrier diffusion lengths and defect tolerance that arise from the materials' unique dielectric properties. Although much of the initial interest in lead halide perovskites was geared towards producing highly efficient solar cells from the bulk material, cubic perovskite …
-
The uncommon nature of point defects in organic-inorganic Perovskite solar cells
… properties that contributed to this success is "defect tolerance": in organic-inorganic perovskites, the majority of point defects with low formation energy are shallow, with energies within or near the conduction or valence band. Defects with deep states, which act as electronic traps, are …
-
Interplay of optoelectronic properties and solar cell performance in multidimensional perovskites
… 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 from 3D to lower …
-
Mechanical behavior of dip-brazed aluminum sandwich panels
… panel assemblies were joined via dip brazing. Defects were introduced into some panels to quantify the effect on strength and stiffness. Hybrid sandwich panels, consisting of foam material in the void spaces of the square and triangular cells were evaluated for the effect on the defect …
-
Autonomous Computing Systems
… have been masked out, in a manner suitable for defect tolerance.
-
Tools and Techniques for Evaluating Reliability Trade-offs for Nano-Architectures
… will introduce unprecedented level of defects in the substrates, and architectural designs need to accommodate the uncertainty inherent at such scales. This consideration motivates the search for new architectural paradigms based on redundancy based defect-tolerant designs. However, …
-
Techniques for Reliable and Efficient Analog to Digital Conversion
… and to replace a faulty stage, to enhance defect tolerance or improve yield. Simulations demonstrate that with the reconfiguration technique, a pipelined ADC is more robust, tolerating performance degradation and defects. With technology scaling, digital calibrations are becoming popular …
-
Null Convention Logic applications of asynchronous design in nanotechnology and cryptographic security
… have been analyzed numerically. 3) Presented the defect-tolerance and repair strategies for both DR-ANRCA and MLUT-ANRCA. The following are the contributions of the second application: 1) Designed an NCL based S-Box for Advanced Encryption Standard (AES). Functional verification has been done …
-
Oxygen defect engineering for silicon solar cell applications : process design and modeling
… of silicon solar cells are oxygen ring defects that are incorporated into the material during growth. These defects decrease overall cell efficiencies by around 20% (rel.) resulting in a yield loss of about 1/4 h of each monocrystalline silicon ingot. To control the oxygen defects and …
-
Characterizing and using defects in high-temperature superconductor cables and magnets
… fusion devices aiming to achieve net energy. Defects in HTS pose manufacturing, cost, and operational challenges. A rigorous understanding and predictive capability for defect-induced behavior at relevant scale has not been established. To address this shortcoming, a cable-level defect …
-
Synthesis and Characterization of Chalcogenide Perovskites
… study related questions in those fields such as defect tolerance in lead-halide perovskites and ferroelectricity in oxides. The following projects represent advances in both synthesis and characterization of chalcogenide perovskites. I used computational software to calculate phase diagrams for …
-
Fatigue and Fracture Behavior of Graphene-based Nanomaterials
… was a thermally activated process, an extreme defect sensitivity was captured for graphene in which the fatigue life was completely dominated by the first covalent bond dissociation. Considering the inevitability of defects, such a drawback stressed a need for modifying the lattice structure of …
-
In-Situ and Operando Multimodal Microscopy of Metal Halide Perovskite Optoelectronic Devices
… This study helps to explain the remarkable defect tolerance of these materials. The final experimental chapter augments the optical microscopy setup to measure voltage dependent photoluminescence maps. Voltage dependent photoluminescence allows the extraction of pseudo current-voltage curves …
-
Development of Multi-Microscopy Techniques for the Characterisation of Nitride Semiconductors
… typically contain a high density of extended defects, particularly threading dislocations (TDs). Despite the relative defect tolerance of these materials, it is important to understand how particular defects impact the electronic and optical properties. The direct correlation of measurements …
-
Next generation optoelectronic devices for energy applications utilising metal oxides, bismuth oxyhalides and lead halide perovskites
… structure of LHPs, which is conducive to defect tolerance, and indeed BiOI has been found to be defect tolerant. However, BiOI has a layered structure, leading to anisotropic transport properties. In this thesis, there are three projects on BiOI. The first examines how the preferred …
-
Developing next generation, non-toxic, inorganic materials for photovoltaics and thin-film transistors
… work function. The experimental examination of defect tolerance of BiOI is conducted in chapter three. BiOI films are vacuum-annealed to induce surface composition changes. Large changes in surface atomic fractions (reduction in iodine and bismuth by 40% and 5% respectively, and increase in …
Page 1 of 2