A5015919152- Non-Destructive Testing Techniques
- Silicon and Solar Cell Technologies
- Ferroelectric and Piezoelectric Materials
- Advanced Sensor and Energy Harvesting Materials
- Ultrasonics and Acoustic Wave Propagation
- Photovoltaic System Optimization Techniques
- Dielectric materials and actuators
- Acoustic Wave Resonator Technologies
- Semiconductor materials and interfaces
- Conducting polymers and applications
- Multiferroics and related materials
- Welding Techniques and Residual Stresses
- Silicon Carbide Semiconductor Technologies
- Electronic and Structural Properties of Oxides
- Force Microscopy Techniques and Applications
- Block Copolymer Self-Assembly
- Hydrogen embrittlement and corrosion behaviors in metals
- Smart Materials for Construction
- BIM and Construction Integration
- Fatigue and fracture mechanics
- Space Science and Extraterrestrial Life
- Science, Research, and Medicine
- Geophysical Methods and Applications
- Sensor Technology and Measurement Systems
- Space exploration and regulation
University of Connecticut
2017-2023
Deep Ocean Engineering (United States)
2012
United States Air Force Research Laboratory
2002-2006
Wright-Patterson Air Force Base
1984-2005
Iowa State University
1974
Abstract The organic insulator–metal interface is the most important junction in flexible electronics. strong band offset of insulators over Fermi level electrodes should theoretically impart a sufficient impediment for charge injection known as Schottky barrier. However, defect formation through Anderson localization due to topological disorder polymers leads reduced barriers and hence cumbersome devices. A facile nanocoating comprising hundreds highly oriented organic/inorganic alternating...
Abstract Material surfaces encompass structural and chemical discontinuities that often lead to the loss of property interest in so-called dead layers. It is particularly problematic nanoscale oxide electronics, where integration strongly correlated materials into devices obstructed by thickness threshold required for emergence their functionality. Here we report stabilization ultrathin out-of-plane ferroelectricity heterostructures through design an artificial flux-closure architecture....
Abstract Polymer dielectrics are essential for advanced electrical and electronic power systems due to their ultrafast charge–discharge rate. However, a long‐standing challenge is maintain dielectric performance at high temperatures. Here, layered barium titanate/polyamideimide nanocomposite reinforced with rationally designed interfaces reported high‐temperature high‐energy‐density dielectrics. Nanocoatings composed of 2D montmorillonite nanosheets anisotropic conductivities interposed two...
Onsite real-time nondestructive evaluation of aircraft using eddy current techniques has gained significance in the past few years. In this paper, emphasis is placed on developing a flexible and fast inspection system giant magnetoresistive (GMR) field sensors. Experimental signals are compared with finite-element model (FEM) simulations acquired traditional data acquisition methods. Several advantages improved design discussed.
Ferroelectric domain walls are quasi-2D systems that show great promise for the development of nonvolatile memory, memristor technology, and electronic components with ultrasmall feature size. Electric fields, example, can change wall orientation relative to spontaneous polarization switch between resistive conductive states, controlling electrical current. Being embedded in a 3D material, however, not perfectly flat form networks, which leads complex physical structures. In this work,...
Abstract To satisfy continual demands for higher performance dielectrics in multi‐layer ceramic capacitors and related microelectronic devices, novel characterization methods are necessary mapping materials properties down to the nanoscale, where enabling developments increasingly relevant. Accordingly, an atomic force microscopy‐based approach is implemented characterizing insulator based on of discharging dynamics. Following surface charging by biasing a conducting tip contacting...
Local variation in surface skimming longitudinal wave (SSLW) velocity has been measured using a scanning acoustic microscope. A very narrow width electrical impulse used to excite the transducer of lens. This permits separation SSLW signal from direct reflected time domain. simple method measuring delay between directly and at two defocuses utilized for local measurement velocity. The over an area sample is scaled presented as image. implemented image around crack tip Ti-6Al-4V. Since known...
We have studied the degradation of both full-sized modules and minimodules with PERC Al-BSF cell variations in fields while considering packaging strategies. demonstrate implementations data-driven tools to analyze large numbers volumes timeseries data obtain performance loss pathways. This analysis pipeline enables quantitative comparison ranking module variations, as well mapping deeper understanding mechanisms. The best performing is a half-cell PERC, which shows rate ( PLR ) −0.27 ±...
Nanocoatings In article number 2101374, Yang Cao, Luyi Sun, and co-workers present a layered nanocoating comprising hundreds of highly oriented organic/inorganic alternating nanolayers on the polymer surface to revive Schottky barrier for effective charge-injection blocking. The superior 2D assembly leads flexible material architecture at electrode–dielectric interface, thus providing novel design strategy high-performance dielectrics integrated electronics.
Exfoliated montmorillonite nanosheets were self-assembled with poly(vinyl alcohol) on the surface of polymer films to form an organic/inorganic hybrid nanocoating. It was experimentally demonstrated that highly oriented and aligned laminates nanocoating has a remarkable positive effect breakdown strength substrate including polyethylene, polystyrene Kapton®. The improvement is attributed geometric confinement multilayer structure within coating, which forms barriers prevent charge injecting...
Recent advancements in small, microscopic NDE sensor technologies will revolutionize how aircraft maintenance is done, and significantly improve the reliability airworthiness of current future systems. A variety micro/nano systems concepts are being developed that enable whole new capabilities for detecting tracking structural integrity damage. For aging systems, impact micro-NDE be felt immediately, with dramatic reductions labor maintenance, extended useable life critical components two...
To assess the reliability of PERC cells compared to Al-BSF in a commercial setting minimodules with cell and encapsulant combinations are accelerated exposure. In both modified damp heat full spectrum light exposures, white EVA samples showed higher susceptibility for metallization corrosion degradation than all other encapsulants. particular power loss EVA. It was observed that degree had strong significance on manufacturer encapsulant. exposures much stronger predictor type. For modules...
Minimodules with half-cell variants of multi-Si Al-BSF, mono-Si bifacial PERC, and backside encapsulant variations UV cutoff white EVA POE are exposed, stepwise, to modified damp heat (80°C/85%RH) conditions. The is run at 80C/85 % relative humidity maintain a temperature below the glass transition PET, maintaining conditions that more similar outdoor operation. I-V EL results show corrosion predominant form degradation, being most severe in modules. Al-BSF cells particular large degree...
Ferroelectric domain walls are quasi-2D systems that show great promise for the development of non-volatile memory, memristor technology and electronic components with ultra-small feature size. Electric fields, example, can change wall orientation relative to spontaneous polarization switch between resistive conductive states, controlling electrical current. Being embedded in a 3D material, however, not perfectly flat form networks, which leads complex physical structures. We demonstrate...
Abstract The dynamics of ferroelectric domain switching are directly mapped in a PbZr 0.2 Ti 0.8 O 3 thin film using piezoresponse force microscopy. Employing the rastering tip as poling electrode to locally apply fixed bias near coercive field, while simultaneously monitoring evolving pattern during continuous imaging, effectively independent for numerous domains investigated. While areal follows anticipated S‐curve, this is shown be collective outcome linear terminal radial growth an...
A focused acoustic transducer consisting of three separated elements has been designed to perform local phase measurements. The outer have used generate and receive Rayleigh Surface Acoustic Waves (RSAW) generated at the interface between water sample. central element is utilized direct reflected signal from surface tone burst split into two parts; one part fed other elements. comparison received signals a defocus related relative changes in RSAW velocity. Measurements across an electron...