A5017874729- Chalcogenide Semiconductor Thin Films
- X-ray Spectroscopy and Fluorescence Analysis
- Perovskite Materials and Applications
- Ion-surface interactions and analysis
- Radioactivity and Radon Measurements
- Nuclear Physics and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Heavy metals in environment
- Solid-state spectroscopy and crystallography
- High-pressure geophysics and materials
- Geological and Geochemical Analysis
- Quantum Dots Synthesis And Properties
- Fusion materials and technologies
- Radiation Shielding Materials Analysis
- Semiconductor materials and devices
- Silicon Nanostructures and Photoluminescence
- Phytochemicals and Medicinal Plants
- Luminescence Properties of Advanced Materials
- Electron and X-Ray Spectroscopy Techniques
- Magnetic and transport properties of perovskites and related materials
- Nuclear materials and radiation effects
- Semiconductor materials and interfaces
- Mercury impact and mitigation studies
- Heavy Metals in Plants
- Additive Manufacturing Materials and Processes
University of North Texas
2012-2025
Sandia National Laboratories
2021
University of Louisiana at Lafayette
2018
Abstract Perovskite photovoltaics have been shown to recover, or heal, after radiation damage. Here, we deconvolve the effects of based on different energy loss mechanisms from incident protons which induce defects can promote efficiency recovery. We design a dual dose experiment first exposing devices low-energy efficient in creating atomic displacements. Devices are then irradiated with high-energy that interact differently. Correlated modeling, (with increased ionizing component)...
Abstract Particulate matter (PM) found in the air is one of major sources pollution and air‐borne diseases. Therefore, it imperative to examine elemental concentration distribution PM identify pollutant sources. In this study, has demonstrated capabilities micro‐particle‐induced X‐ray emission (micro‐PIXE) spectroscopy quantitative analysis samples collected from Old Delhi outdoor market indoor locations Panjab University hostel winter months. A 2‐million electronvolts energetic scanning...
Mixed organic–inorganic halide perovskite-based solar cells have attracted interest in recent years due to their potential for both terrestrial and space applications. Analysis of interfaces is critical predicting device behavior optimizing architectures. Most advanced tools study buried are destructive nature can induce further degradation. Ion beam techniques, such as Rutherford backscattering spectrometry (RBS), a useful non-destructive method probe an elemental depth profile multilayered...
Abstract Airborne dust can alter ecosystem productivity and biogeochemical cycling by enhancing atmospheric nutrient pollutant deposition. Wet deposition (dust‐in‐rain) is less frequently quantified than dry but represents a potentially significant flux to ecosystems. We dust‐in‐rain event frequency, influence on rainwater ionic elemental composition, wet dissolved particulate during weeks affected all other (background samples) at two sites across Texas (one arid, Guadalupe Mountains, one...
The high tolerance and stability of triple halide perovskite solar cells is demonstrated in practical space conditions at irradiation levels. were irradiated for a range proton energies (75 keV, 300 1 MeV) fluences (up to 4 × 1014 p/cm2). the energy irradiations varied induce same amount vacancies absorber layer due non-ionizing nuclear loss (predominant <300 keV) electron ionization >300 keV). While initially resulted degradation photovoltaic parameters, self-healing was...
The freely available “Stopping and Range of Ions in Matter” (SRIM) code is used for evaluating ion beam ranges depth profiles. We present secondary mass spectrometry Rutherford backscattering experimental results Si samples implanted with low energy Sb ions to evaluate the accuracy SRIM simulations. show that simulation systematically overestimates range by 2–6 nm this overestimation increases larger implantation energy. For lowest investigated, here we find up a 25% error between measured...
The radiation resistance of single-phase high entropy alloys has been reported to be superior conventional alloys, due their lattice distortion and sluggish diffusion kinetics. current study combines the beneficial effects a concentrated multi-component solid solution chemical ordering on parent candidate alloy, Al0.3CoFeNi, enhance proton resistance. strong tendency in this alloy results formation Ni-Al-rich short-range ordered (SRO) domains when it is annealed single FCC phase field water...
ACIGS solar cells are exposed to targeted radiation probe the front and back interfaces of absorber assess impact space environments on these systems. These data suggest more radiation‐hard than early CIGS devices likely due lower defect densities ideal in system. A combination J – V external quantum efficiency measurements indicates some improvement performance device effects local heating dominant ionizing electronic energy loss regime proton irradiation that anneal upper CdS/ACIGS...
The newly designed and constructed electrostatic quadrupole doublet (EQD) at the University of North Texas (UNT) has achieved mass independent focusing MeV particles to a spot size 3.3 × 3.5 μm. EQD is compared Louisiana magnetic which also in use UNT. Characteristics such as demagnification sensitivity aberrations are simulated by matrix raytracing software, propagation rays matrices for each system. Particle induced x-ray emission (PIXE) maps 2000 mesh Cu grid show that both doublets...
Transition-metal doped Indium Phosphide (InP) has been studied over several decades for utilization in optoelectronics applications. Recently, interesting magnetic properties have reported metal clusters formed at different depths surrounded by a high quality InP lattice. In this work, we accumulation of Ni atoms various via implantation Ni- followed H– and subsequently thermal annealing. Prior to the ion implantations, implant depth profile was simulated using an ion-solid interaction code...