A5018035687- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Hydrocarbon exploration and reservoir analysis
- Semiconductor materials and interfaces
- Geological and Geochemical Analysis
- Hydraulic Fracturing and Reservoir Analysis
- Nanowire Synthesis and Applications
- earthquake and tectonic studies
- Metal and Thin Film Mechanics
- Perovskite Materials and Applications
- Methane Hydrates and Related Phenomena
- Copper-based nanomaterials and applications
- Bacterial biofilms and quorum sensing
- High-pressure geophysics and materials
- Geochemistry and Geologic Mapping
- Semiconductor materials and devices
- Advanced Semiconductor Detectors and Materials
- Conducting polymers and applications
- Seismic Imaging and Inversion Techniques
- Paleontology and Stratigraphy of Fossils
- Advancements in Semiconductor Devices and Circuit Design
- Seismology and Earthquake Studies
- Bone Tissue Engineering Materials
- Organic Electronics and Photovoltaics
- Titanium Alloys Microstructure and Properties
Durham University
2016-2025
Diamond Light Source
2024
Umm al-Qura University
2024
University of Oxford
2024
University of Liverpool
2024
Durham Technical Community College
2020
We report on the Au-free molecular beam epitaxy growth of coherent GaAs nanowires directly Si(111) substrates. The is catalyzed by liquid Ga droplets formed in openings a native oxide layer at initial stage. Transmission electron microscopy studies demonstrate that are single crystals having zincblende structure along their length (apart from thin wurtzite region below droplet), regardless diameter (70--80 nm) and temperature range $(560--630\text{...
Minerals stabilize organic carbon (OC) in sediments, thereby directly affecting global climate at multiple scales, but how they do it is far from understood. Here we show that manganese oxide (Mn oxide) a water treatment works filter bed traps dissolved OC as coatings build up layers around clean sand grains 3%w/wC. Using spectroscopic and thermogravimetric methods, identify two main fractions. One thermally refractory (>550 °C) the other more labile (<550 °C). We postulate thermal stability...
Abstract In a modern peritidal microbial mat from Qatar, both biomediated carbonates and Mg‐rich clay minerals (palygorskite) were identified. The mat, ca 5 cm thick, shows clear lamination reflecting different communities. initial precipitates within the top millimetres of are composed Ca–Mg–Si–Al–S amorphous nanoparticles (few tens nanometres) that replace ultrastructure extracellular polymeric substances. substances enriched in same cations act as substrate for mineral nucleation....
Abstract Titanium-based implants are ubiquitous in the healthcare industries and often suffer from bacterial attachment which results infections. An innovative method of reducing growth is to employ nanostructures on implant materials that cause contact-dependent cell death by mechanical rupture membranes. To achieve this, we synthesized with different architectures titanium surfaces using hydrothermal treatment processes then examined Staphylococcus epidermidis these surfaces. The structure...
Thin film solar cells based on cadmium telluride (CdTe) are complex devices which have great potential for achieving high conversion efficiencies. Lack of understanding in materials issues and device physics slows down the rapid progress these devices. This paper combines relevant results from literature with new a research programme electro-plated CdS CdTe. A wide range analytical techniques was used to investigate structures. It has been experimentally found that n-, i- p-type CdTe can be...
Incorporation of CdSe layers into CdTe thin film solar cells has recently emerged as a route to improve cell performance. It been suggested that the formation lower band gap CdTe(1-x)Se(x) phases following Se diffusion induces bandgap grading which may increase carrier lifetime and thereby open circuit voltage. In this study we investigate impact incorporation on We demonstrate standard CdS/CdTe device architecture is incompatible with incorporation, owing large optical losses. An...
Anomalously high porosities and permeabilities are commonly found in the fluvial channel sandstone facies of Triassic Skagerrak Formation central North Sea at burial depths greater than 3200 m (10,499 ft), from which hydrocarbons currently being produced. The aim our study was to improve understanding diagenesis help predict whether with porosity may be even depths. sandstones comprise fine medium-grained arkosic lithic-arkosic arenites. We have used scanning electron microscopy,...
The carrier-type of the emerging photovoltaic Sb2Se3 was evaluated for both thin films and bulk crystals via a range complementary techniques. X-ray photoelectron spectroscopy (XPS), hot probe, Hall effect, surface photovoltage showed synthesized from granulate material to be n-type with chlorine identified as an unintentional dopant secondary ion mass spectrometry analysis. validity confirmed by synthesis intrinsic metallic precursors subsequent deliberate doping addition MgCl2. Chlorine...
Antimony selenide (Sb <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> Se xmlns:xlink="http://www.w3.org/1999/xlink">3</sub> ) is an emerging chalcogenide photovoltaic absorber material that has been the subject of increasing interest in recent years, demonstrating rapid efficiency increases with a simple, abundant, and stable. This paper examines from both theoretical practical standpoint. The viability Sb as solar assessed maximum...
Abstract CdTe thin-film solar cells are now the main industrially established alternative to silicon-based photovoltaics. These remain reliant on so-called chloride activation step in order achieve high conversion efficiencies. Here, by comparison of effective and ineffective treatments, we show role process be modification grain boundaries through chlorine accumulation, which leads an increase carrier lifetime. It is also demonstrated that while improvements fill factor short circuit...
Abstract The evolution of Sb 2 Se 3 heterojunction devices away from CdS electron transport layers (ETL) to wide bandgap metal oxide alternatives is a critical target in the development this emerging photovoltaic material. Metal ETL/Sb device performance has historically been limited by relatively low fill factors, despite offering clear advantages with regards photocurrent collection. In study, TiO ETLs are fabricated via direct current reactive sputtering and tested complete devices. A...
ITO/ZnO/CdS/CdTe/Mo solar cells have been grown in the substrate configuration by a combination of close-space sublimation and RF sputtering. A peak efficiency 8.01% was achieved. two stage CdCl2 annealing process developed, with first contributing to CdTe doping second being linked CdTe/CdS interdiffusion secondary ion mass spectrometry analysis. The inclusion ZnO layer between CdS ITO layers improved performance significantly (from η=6% η=8%) increasing shunt resistance, RSH, from 563 Ω...
One-dimensional nanostructures, such as nanorod (NR) arrays, are expected to improve the photovoltaic (PV) response of solar cells with an ultrathin absorber due increased areal (junction) density and light trapping. We report on deposition CdS CdTe:As semiconductor thin films ZnO NR arrays by means metalorganic chemical vapour (MOCVD). The change in optical properties NRs upon growth shell was monitored compared simulated data, which confirmed presence strong scattering effects visible near...
Extracellular DNA (eDNA) has been identified in the matrix of many different monospecies biofilms vitro, including some those produced by oral bacteria. In cases, eDNA stabilizes structure biofilms. Here, authors aimed to determine whether is an important component natural, mixed-species biofilms, such as plaque on natural teeth or dental implants. To visualize approaches for fluorescently stained with either anti-DNA antibodies ultrasensitive cell-impermeant dye, YOYO-1, were first...
Abstract Despite the recent success of CdS/Sb 2 Se 3 heterojunction devices, cadmium toxicity, parasitic absorption from relatively narrow CdS band gap (2.4 eV) and multiple reports inter‐diffusion at interface forming Cd(S,Se) Sb (S,Se) phases, present significant limitations to this device architecture. Among options for alternative partner layers in antimony chalcogenide solar cells, wide gap, non‐toxic titanium dioxide (TiO ) has demonstrated most promise. It is generally accepted that...
Abstract A breakthrough in the fabrication of amorphous Zn‐Sn‐O (ZTO)‐based thin‐film transistors (TFTs) is presented for volatile organic compound (VOC) detection. The incorporation highly abundant materials offers substantial economic and environmental benefits. However, analyses design a multilayer channel are still limited. This work demonstrates that chemical environment influences ZTO‐based TFTs' carrier transport properties can be tailored detecting specific VOCs, ensuring high...
A graphene-based supramolecular gel was designed and prepared to control the crystallization process polymorphism of pharmaceuticals. The gelators were modified at end segments with pyrene moieties, which spontaneously interact graphene surface by aromatic stacking interaction resulting in a graphene-incorporated linked noncovalent interactions between urea groups. When included into gel, critical concentration system rigidity changed significantly, fluorescence spectroscopy determined close...
Respirable crystalline silica (RCS) continues to pose a risk human health worldwide. Its variable toxicity depends on inherent characteristics and external factors which influence surface chemistry. Significant population exposure RCS occurs during volcanic eruptions, where ashfall may cover hundreds of square km last years. Occupational also through mining deposits. The primary source from volcanoes is collapse fragmentation lava domes within cristobalite mass produced. After 30 years...
Peak temperature of a Ag thin film on Si and SEM images the resultant nanoparticles by our MONA-LISA process.