ORCID Profile
0000-0003-1493-0682
Current Organisation
Macquarie University
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Research Topics
In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Top 5 Research Topics
ANZSRC Field of Research (FoR)
Nanotechnology | Nanoscale Characterisation | Cellular Interactions (incl. Adhesion, Matrix, Cell Wall) | Nanomaterials | Microelectronics and Integrated Circuits | Photodetectors, Optical Sensors and Solar Cells | Metals and Alloy Materials | Electrical and Electronic Engineering | Quantum Information, Computation and Communication | Nanofabrication, Growth and Self Assembly
ANZSRC Socio-Economic Objective (SEO)
Solar-Photovoltaic Energy | Basic Iron and Steel Products | Expanding Knowledge in the Physical Sciences | Scientific Instruments | Integrated Circuits and Devices | Expanding Knowledge in the Information and Computing Sciences | Neurodegenerative Disorders Related to Ageing | Expanding Knowledge in the Biological Sciences | Expanding Knowledge in the Medical and Health Sciences |
Related Links
Publications
Self-Organized Growth of II-VI Wide Bandgap Quantum Dot Structures
Publisher: Wiley
Date: 08-1997
DOI: 10.1002/1521-3951(199708)202:2<827::AID-PSSB827>3.0.CO;2-8
Room-temperature green luminescence and lasing of thin CdS films on glass formed by pulsed laser-deposition
Publisher: IEEE
Date: 1999
Review of SiGe HBTs on SOI
Publisher: Elsevier BV
Date: 09-2005
Single step deposition method for nearly stoichiometric CuInSe2 thin films
Publisher: Elsevier BV
Date: 03-2011
Nanostructured biomimetic moth-eye arrays in silicon by nanoimprint lithography
Publisher: SPIE
Date: 20-08-2009
DOI: 10.1117/12.826201
Characterization of experimental textured ZnO:Al films for thin film solar cell applications and comparison with commercial and plasmonic alternatives
Publisher: IEEE
Date: 06-2010
High temperature excitonic stimulated emission from ZnO epitaxial layers
Publisher: AIP Publishing
Date: 24-08-1998
DOI: 10.1063/1.122077
Abstract: The emission spectrum of high quality ZnO epilayers is studied from room temperature up to 550 K. At room temperature and low excitation power a single emission peak is observed which may be identified with the free exciton from its peak energy and dependence on temperature. However, when excitation intensities exceed 400 kW cm−2 a sharp peak emerges at lower energy which we attribute to exciton-exciton scattering. At higher excitation intensities (& kW cm−2) a second stimulated emission peak emerges at even lower energies: we attribute this peak to be stimulated emission of an electron hole plasma. Similar features are observed for all temperatures up to 550 K.
Metal-Organic-Frameworks: Low Temperature Gas Sensing and Air Quality Monitoring
Publisher: MDPI AG
Date: 08-11-2021
DOI: 10.3390/CHEMOSENSORS9110316
Abstract: As an emerging class of hybrid nanoporous materials, metal-organic frameworks (MOFs) have attracted significant attention as promising multifunctional building blocks for the development of highly sensitive and selective gas sensors due to their unique properties, such as large surface area, highly ersified structures, functionalizable sites and specific adsorption affinities. Here, we provide a review of recent advances in the design and fabrication of MOF nanomaterials for the low-temperature detection of different gases for air quality and environmental monitoring applications. The impact of key structural parameters including surface morphologies, metal nodes, organic linkers and functional groups on the sensing performance of state-of-the-art sensing technologies are discussed. This review is concluded by summarising achievements and current challenges, providing a future perspective for the development of the next generation of MOF-based nanostructured materials for low-temperature detection of gas molecules in real-world environments.
Evaluating the accuracy of point spread function deconvolutions applied to luminescence images
Publisher: IEEE
Date: 06-2016
Modeling SWCNT Bandgap and Effective Mass Variation Using a Monte Carlo Approach
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 03-2010
Nanofabrication with the Helium Ion Microscope
Publisher: Springer Science and Business Media LLC
Date: 2012
DOI: 10.1557/OPL.2012.978
Abstract: Although initially developed as an imaging tool, the helium ion microscope (HIM) is finding applications in nanofabrication as its focused ion beam is capable of highly-localized material modification. In this study, an external pattern generator is used to explore the capabilities of the HIM for localized milling of a ∼7 nm thick layer of silicon-on-insulator, with atomic force microscopy (AFM) used to characterize the resulting patterns. The dose and patterned area size are varied and milling to depths nm is demonstrated. At high doses and large areas, protuberances form, primarily due to sub-surface swelling caused by the implanted helium. The results suggest this technique could enable the rapid prototyping of next-generation nanoelectronic devices in thin silicon.
Optical characterisation of a spectrally tunable plasmonic reflector for application in thin-film silicon solar cells
Publisher: Elsevier BV
Date: 04-1978
Helium ion microscopy of Lepidoptera scales
Publisher: Wiley
Date: 27-07-2011
DOI: 10.1002/SCA.20267
Abstract: In this report, helium ion microscopy (HIM) is used to study the micro and nanostructures responsible for structural color in the wings of two species of Lepidotera from the Papilionidae family: Papilio ulysses (Blue Mountain Butterfly) and Parides sesostris (Emerald-patched Cattleheart). Electronic charging of uncoated scales from the wings of these butterflies, due to the incident ion beam, is successfully neutralized, leading to images displaying a large depth-of-field and a high level of surface detail, which would normally be obscured by traditional coating methods used for scanning electron microscopy (SEM). The images are compared with those from variable pressure SEM, demonstrating the superiority of HIM at high magnifications. In addition, the large depth-of-field capabilities of HIM are exploited through the creation of stereo pairs that allows the exploration of the third dimension. Furthermore, the extraction of quantitative height information which matches well with cross-sectional transmission electron microscopy measurements from the literature is demonstrated.
Integrated Simulator and Hardware Platform for Dynamic Photovoltaic Array Optimization and Testing
Publisher: American Scientific Publishers
Date: 02-2015
Microfabrication of gold wires for atom guides
Publisher: Elsevier BV
Date: 09-2004
Diffuse Reflectance and Absorption Characteriation of a Plasmonic Back Reflector for Application in Thin Film Si Solar Cells
Publisher: Springer Science and Business Media LLC
Date: 2012
DOI: 10.1557/OPL.2012.854
Abstract: A plasmonic back reflector has been fabricated for light-trapping application in thin film Si photovoltaic devices. The back reflector comprises of a 2D array of self-organized Ag NPs separated from a planar Ag mirror by a ZnO layer deposited by atomic-layer deposition. The diffuse reflectance and parasitic absorption losses can be modulated by varying the ZnO thickness. A maximum diffuse reflectance peak value of 30% at 950 nm, with a bandwidth of 400nm, is observed for ∼100 nm diameter NPs at a distance of 50 nm from the Ag mirror. Finite-difference time-domain simulations of a 100nm Ag sphere near a mirror were used to understand the experimentally observed trends in diffuse reflectance and parasitic absorption, with distance from the mirror. Particles very close to the mirror can couple to delocalized surface plasmons or exhibit Fano resonance effects, thereby increasing parasitic absorption. Particles situated away from the mirror are influenced by driving-field effects due to the interaction of incident and reflected photons, which modulate the scattering cross-section.
Photoluminescence properties of thin CdS films on glass formed by laser ablation
Publisher: Elsevier BV
Date: 03-1999
Optimization of moth-eye antireflection schemes for silicon solar cells
Publisher: Wiley
Date: 05-2010
DOI: 10.1002/PIP.951
Tuning Light Scattering by Periodic Metal Nanoparticle Arrays for Solar Cell Applications
Publisher: Springer Science and Business Media LLC
Date: 2012
DOI: 10.1557/OPL.2012.693
Abstract: The drive to reduce the thickness of solar cells is putting ever greater demands on light-trapping techniques. Techniques are required to improve absorption of light within the semiconductor, while not adversely affecting the electrical properties of the device. Conventional diffraction gratings can scatter visible and near-infrared photons into large angles, which get trapped in the silicon layer by total internal reflection. However, diffraction gratings typically have large feature sizes and so increase the overall surface area of a solar cell compared to the planar case. A periodic arrangement of metal nanoparticles acts as a diffraction grating, but an over-coated semiconductor will have a similar surface area to a planar layer due a combination of a low particle height and low surface coverage. Random arrays of identical metal nanoparticles feature Lorentzian scattering peaks that can be tuned by modifying the size and shape of the particle. Periodic arrays have much more complicated scattering peaks, due to the enhancement and suppression of scattering at different wavelengths caused by the constructive and destructive interference between each nanoparticle. In effect the scattering spectrum of the in idual nanoparticle is modified by the diffractive orders of the array, and so both parameters must be optimized together. We have studied periodic arrays of metal nanoparticles fabricated using electron-beam lithography, and characterised their reflectance properties. The optical properties of the fabricated arrays were found to be in good agreement with finite-difference time-domain (FDTD) simulations. Au and Al nanoparticles are found to have a strong scattering effect and Al nanoparticles are also shown to exhibit an anti-reflection effect in combination with scattering. This work is focused on verifying that FDTD simulations can accurately model metal nanoparticle arrays and then extending the simulations to determine the previously unknown transmittance characteristics of metal nanoparticle arrays on silicon.
Optical properties of gold and aluminium nanoparticles for silicon solar cell applications
Publisher: AIP Publishing
Date: 15-04-2011
DOI: 10.1063/1.3574657
Abstract: The optical properties of metal nanoparticles are explored as a function of lateral size, shape, aspect-ratio and metal type. Simulations based on the discrete dipole approximation are compared with experimental measurements of arrays of metal nanoparticles fabricated by electron-beam lithography. Careful selection of experimental parameters ensures minimization of far-field and near-field coupling, and inhomogeneous broadening, thus allowing comparison with single particle simulations. The optical properties of Au nanoparticles are compared with similar Al nanoparticles for each particle type. For solar cell light-trapping applications, we require metal nanoparticles that exhibit extinction peaks near the band-edge region of the absorbing material, as well as low absorption and large optical cross-sections. Al nanoparticles are shown to be of interest for amorphous silicon solar cells, but their applications for polycrystalline solar cells is limited by the presence of an interband region in the near-infrared. The opposite is found for Au nanoparticles, which feature an interband threshold region in the visible that makes their optical properties unsuitable for amorphous silicon but very suitable for crystalline and polycrystalline silicon solar cells.
A new analytical model for predicting SWCNT band-gap from geometrical properties
Publisher: IEEE
Date: 06-2008
Fabrication and characterization of n-ZnO/p-AlGaN heterojunction light-emitting diodes on 6H-SiC substrates
Publisher: AIP Publishing
Date: 02-12-2003
DOI: 10.1063/1.1632537
Abstract: We report on the fabrication of n-ZnO -AlGaN heterojunction light-emitting diodes on 6H-SiC substrates. Hydride vapor phase epitaxy was used to grow p-type AlGaN, while chemical vapor deposition was used to produce the n-type ZnO layers. Diode-like, rectifying I–V characteristics, with threshold voltage ∼3.2 V and low reverse leakage current ∼10−7 A, are observed at room temperature. Intense ultraviolet emission with a peak wavelength near 389 nm is observed when the diode is forward biased this emission is found to be stable at temperatures up to 500 K and shown to originate from recombination within the ZnO.
Silicon-Germanium: Properties, Growth and Applications
Publisher: Springer International Publishing
Date: 2017
A detailed study of p–n junction solar cells by means of collection efficiency
Publisher: Elsevier BV
Date: 2007
Quantifying and Improving Student Engagement with Remotely Accessible Laboratory Project Hardware (RALPH)
Publisher: IEEE
Date: 08-12-2020
Helium ion beam milling to create a nano-structured domain wall magnetoresistance spin valve
Publisher: IOP Publishing
Date: 12-09-2012
DOI: 10.1088/0957-4484/23/39/395302
Abstract: We have fabricated and measured single domain wall magnetoresistance devices with sub-20 nm gap widths using a novel combination of electron beam lithography and helium ion beam milling. The measurement wires and external profile of the spin valve are fabricated by electron beam lithography and lift-off. The critical bridge structure is created using helium ion beam milling, enabling the formation of a thinner gap (and so a narrower domain wall) than that which is possible with electron beam techniques alone. Four-point probe resistance measurements and scanning electron microscopy are used to characterize the milled structures and optimize the He ion dose. Successful operation of the device as a spin valve is demonstrated, with a 0.2% resistance change as the external magnetic field is cycled. The helium ion beam milling efficiency as extracted from electrical resistance measurements is 0.044 atoms/ion, about half the theoretical value. The gap in the device is limited to a maximum of 20 nm with this technique due to sub-surface swelling caused by injected ions which can induce catastrophic failure in the device. The fine patterning capabilities of the helium ion microscope milling technique indicate that sub-5 nm constriction widths could be possible.
Surface Morphology of Transparent Conductive ZnO Film Grown by DC Sputtering Method
Publisher: Trans Tech Publications, Ltd.
Date: 02-2014
DOI: 10.4028/WWW.SCIENTIFIC.NET/AMR.894.403
Abstract: The growth of (0002) orientated polycrystalline undoped and Ga-doped ZnO films by DC sputtering under Ar is described. The (0002) peak intensity decreases with increasing substrate temperature in both doped and undoped s les. The average grain sizes are very small. This indicates that ZnO films with low crystallinity are obtained at high substrate temperatures. It is deduced that surface damage can be increased by high energy plasmas of neutral Ar particles at high substrate temperatures. The average surface roughness for both undoped and Ga-doped ZnO films decreases with increasing substrate temperatures. It is deduced that energies of sputter particles decrease with increasing substrate temperatures due to collisions with Ar particles. The surface roughness corresponds well to the structure model.
Photoacoustic spectroscopy of CuInSe2 thin films
Publisher: Elsevier BV
Date: 04-1993
Large-Area Nanosphere Gratings for Light Trapping and Reduced Surface Losses in Thin Solar Cells
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2019
Organic phosphorus in the terrestrial environment: a perspective on the state of the art and future priorities
Publisher: Springer Science and Business Media LLC
Date: 06-10-2010
Intensity modulation and polarization rotation of visible light by dielectric planar chiral metamaterials
Publisher: AIP Publishing
Date: 31-05-2005
DOI: 10.1063/1.1944211
Abstract: We have demonstrated how dielectric planar chiral surfaces can both modulate the intensity and change the polarization state of visible light diffracted from patterned surfaces. These effects are shown to be dependent on the sense of chirality of the surface and the input polarization state of the light. In idual diffracted beams can show variations of over 30% in their intensities for different input polarization states while opposite enantiomeric structures can exhibit differences of over 50%. The size of these effects could make these surfaces particularly promising candidates for the development of solid-state polarization-state detectors.
Helium ion microscopy and energy selective scanning electron microscopy – two advanced microscopy techniques with complementary applications
Publisher: IOP Publishing
Date: 11-06-2014
Microwave annealing of silicon solar cells
Publisher: AIP Publishing
Date: 03-04-2023
DOI: 10.1063/5.0127896
Abstract: The microwave annealing of semiconductor devices has not been extensively researched and is rarely utilized in industry, yet it has the potential to significantly reduce the time and cost associated with large-volume semiconductor processing, such as the various heating and annealing processes required in the manufacture of photovoltaic modules. In this paper, we describe microwave annealing of silicon solar cells, the effective passivation of light-induced defects, and a reduction in light-induced degradation. We find that silicon solar cells are heated rapidly in a microwave field and that effective B–O defect passivation can be achieved by microwave processing in less than 2 s. Microwave annealing yields similar results as compared to rapid thermal annealing.
<title>Layered chiral metallic meta-materials</title>
Publisher: SPIE
Date: 25-06-2002
DOI: 10.1117/12.472975
Overexcited CdSe quantum well lasers
Publisher: Elsevier BV
Date: 02-1996
Helium ion beam lithography on fullerene molecular resists for sub-10nm patterning
Publisher: Elsevier BV
Date: 04-2016
Photoluminescence and lasing of thin CdS films on glass formed by pulsed-laser-deposition
Publisher: Elsevier BV
Date: 05-2000
Double-polysilicon self-aligned lateral bipolar transistors
Publisher: Springer Science and Business Media LLC
Date: 08-06-2007
The Optimized-String Dynamic Photovoltaic Array
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 04-2014
Solar energy harvesting in the epicuticle of the oriental hornet (Vespa orientalis)
Publisher: Springer Science and Business Media LLC
Date: 29-10-2010
DOI: 10.1007/S00114-010-0728-1
Abstract: The Oriental hornet worker correlates its digging activity with solar insolation. Solar radiation passes through the epicuticle, which exhibits a grating-like structure, and continues to pass through layers of the exo-endocuticle until it is absorbed by the pigment melanin in the brown-colored cuticle or xanthopterin in the yellow-colored cuticle. The correlation between digging activity and the ability of the cuticle to absorb part of the solar radiation implies that the Oriental hornet may harvest parts of the solar radiation. In this study, we explore this intriguing possibility by analyzing the biophysical properties of the cuticle. We use rigorous coupled wave analysis simulations to show that the cuticle surfaces are structured to reduced reflectance and act as diffraction gratings to trap light and increase the amount absorbed in the cuticle. A dye-sensitized solar cell (DSSC) was constructed in order to show the ability of xanthopterin to serve as a light-harvesting molecule.
Micro-cavity lasing of optically excited CdS thin films at room temperature
Publisher: Elsevier BV
Date: 06-2000
Growth of ZnO single crystal thin films on c-plane (0 0 0 1) sapphire by plasma enhanced molecular beam epitaxy
Publisher: Elsevier BV
Date: 10-1997
Plasma assisted molecular beam epitaxy of ZnO on c -plane sapphire: Growth and characterization
Publisher: AIP Publishing
Date: 10-1998
DOI: 10.1063/1.368595
Abstract: ZnO single crystal thin films were grown on c-plane sapphire using oxygen microwave plasma assisted molecular beam epitaxy. Atomically flat oxygen-terminated substrate surfaces were obtained by pre-growth cleaning procedures involving an oxygen plasma treatment. A two dimensional nucleation during the initial growth which is followed by a morphology transition to three dimensional nucleation was observed by in situ reflection high energy electron diffraction. X-ray diffraction (XRD) and photoluminescence investigations suggest that the ZnO epilayer consists of a high quality layer on top of a transition layer containing a high density of defects in the interfacial region. A full width at half maximum (FWHM) of 0.005° is obtained for the ZnO(0002) diffraction peak in an XRD rocking curve, while a broad tail extending from the peak can also be observed. The photoluminescence spectra exhibit dominant bound exciton emission with a FWHM of 3 meV at low temperatures and free exciton emission combined with a very weak deep level emission at room temperature. Recently, these high quality ZnO epilayers have allowed the observation of optically pumped lasing at room temperatures as well as stimulated emission up to 550 K, both of which are due to an exciton related mechanism.
Capillary‐Driven Self‐Assembled Microclusters for Highly Performing UV Photodetectors
Publisher: Wiley
Date: 03-08-2023
Abstract: Self‐assembled nanoparticle networks have emerged as multifunctional building blocks for a new generation of highly sensitive sensing technologies that offer large surface‐to‐volume ratios and a range of associated benefits. Unfortunately, with nanoparticle networks often being held together by weak van der Waals forces, the development of useful commercial devices is slowed by the relatively low robustness and poor carrier transport characteristics. This study shows how the application of a single droplet of ethanol can induce capillary forces capability of delivering significant changes to the morphological, structural, optical, and electronic properties of ZnO nanoclusters. It demonstrates how ZnO nanocluster “dendrites” and nanoparticles are forced together to form micro‐scale islands and larger nanoparticles, and thereby improve the robustness of the layers and the quality of the junctions between the nanoparticles without significantly reducing the overall porosity of the layer or degrading the structural or optical properties in any way. The commensurate improvement in the electronic transport within the layers is found to greatly improve the photoresponse of UV detectors. It seems likely that the application of ethanol and the exploitation of capillary force can provide a technique that can greatly benefit any nanostructured, ultra‐porous device where poor charge transport currently limits performance.
Tunable reflection minima of nanostructured antireflective surfaces
Publisher: AIP Publishing
Date: 29-09-2008
DOI: 10.1063/1.2993231
Abstract: Broadband antireflection schemes for silicon surfaces based on the moth-eye principle and comprising arrays of subwavelength-scale pillars are applicable to solar cells, photodetectors, and stealth technologies and can exhibit very low reflectances. We show that rigorous coupled wave analysis can be used to accurately model the intricate reflectance behavior of these surfaces and so can be used to explore the effects of variations in pillar height, period, and shape. Low reflectance regions are identified, the extent of which are determined by the shape of the pillars. The wavelengths over which these low reflectance regions operate can be shifted by altering the period of the array. Thus the subtle features of the reflectance spectrum of a moth-eye array can be tailored for optimum performance for the input spectrum of a specific application.
Optically pumped lasing of ZnO at room temperature
Publisher: AIP Publishing
Date: 28-04-1997
DOI: 10.1063/1.118824
Abstract: We report the observation of optically pumped lasing in ZnO at room temperature. Thin films of ZnO were grown by plasma-enhanced molecular beam epitaxy on (0001) sapphire substrates. Laser cavities formed by cleaving were found to lase at a threshold excitation intensity of 240 kW cm−2. We believe these results demonstrate the high quality of ZnO epilayers grown by molecular beam epitaxy while clearly demonstrating the viability of ZnO based light emitting devices.
Junction Formation With HWCVD and TCAD Model of an Epitaxial Back-Contact Solar Cell
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2016
Telecommunications Engineering at Macquarie Univerity: Modernisation and Vision
Publisher: IEEE
Date: 12-2018
High-resolution electron beam lithography for the fabrication of high-density dielectric metamaterials
Publisher: Elsevier BV
Date: 02-2007
Mie resonators as rearside light trapping structures in planar crystalline silicon solar cells
Publisher: OSA
Date: 2018
Giant optical activity in dielectric planar metamaterials with two-dimensional chirality
Publisher: IOP Publishing
Date: 23-08-2006
Compact Fabry-Perot electro-optic switch based on n-ZnO/p-Si heterojunction structure
Publisher: IEEE
Date: 08-2012
ZnO as a novel photonic material for the UV region
Publisher: Elsevier BV
Date: 06-2000
Scalable Silicon Nanostructuring for Thermoelectric Applications
Publisher: Springer Science and Business Media LLC
Date: 13-04-2013
Optical Manifestations of Planar Chirality
Publisher: American Physical Society (APS)
Date: 14-03-2003
The molecular size continuum of soil organic phosphorus and its chemical associations
Publisher: Elsevier BV
Date: 04-2022
Bio-Mimetic Subwavelength Surfaces for Near-Zero Reflection Sunrise to Sunset
Publisher: IEEE
Date: 2006
The alternating current dynamic photovoltaic array
Publisher: IEEE
Date: 07-2013
Nonreciprocal diffraction through dielectric gratings with two-dimensional chirality
Publisher: American Physical Society (APS)
Date: 10-04-2008
Spectral response of steady-state photoluminescence from GaAs1-xPx layers grown on a SiGe/Si system
Publisher: AIP Publishing
Date: 18-09-2017
DOI: 10.1063/1.4986134
Abstract: Measuring the spectral response of photoluminescence (SRPL) in solar cells has recently attracted attention as it can be used as a contactless relative measure of external quantum efficiency (EQE) prior to full device fabrication. However, this technique requires that the monitored PL spectrum originates mainly from a region in the solar cell with uniformly distributed majority carriers. For a stack of thin films with a similar material composition, the slightly different emission spectrum from each layer may lead to the superposition of several luminescence peaks. This letter presents the measurement of the SRPL from GaAsP tandem solar cells and outlines a method for separating the in idual layer contributions. Good agreement between measured SRPL and EQE at short wavelengths has been achieved, and the deviations at longer wavelengths have been analyzed. This study also reveals unexpected bandgap narrowing resulting from a variable material composition within the active region.
Fabrication and ab initio study of downscaled graphene nanoelectronic devices
Publisher: SPIE
Date: 27-09-2012
DOI: 10.1117/12.956439
Minimising bulk lifetime degradation during the processing of interdigitated back contact silicon solar cells
Publisher: Wiley
Date: 12-09-2018
DOI: 10.1002/PIP.2928
Microcavity lasing of optically excited cadmium sulfide thin films at room temperature
Publisher: Optica Publishing Group
Date: 15-09-1999
DOI: 10.1364/OL.24.001278
Abstract: We report what is believed to be the first observation of lasing of an optically pumped thin CdS film formed by laser ablation on glass. Laser action is observed at room temperature, and the emission peak is at 501 nm. X-ray diffraction shows that the polycrystalline films are of wurtzite structure and have (002) preferred orientation. Fabry-Perot laser modes are spaced 16 nm apart, indicating a cavity length of 2.9mum . The cavity is formed by consistently self-formed microcavities within the hexagonal lattice.
Raman study of the strain and H2 preconditioning effect on self-assembled Ge island on Si (001)
Publisher: Springer Science and Business Media LLC
Date: 07-2005
Suppression of backscattered diffraction from sub-wavelength ‘moth-eye’ arrays
Publisher: The Optical Society
Date: 02-01-2013
DOI: 10.1364/OE.21.000001
Sunrise to sunset optimization of thin film antireflective coatings for encapsulated, planar silicon solar cells
Publisher: Wiley
Date: 13-03-2009
DOI: 10.1002/PIP.884
Electron beam pumping of CdZnSe quantum well laser structures using a variable energy electron beam
Publisher: Elsevier BV
Date: 02-1996
Broadband scattering of the solar spectrum by spherical metal nanoparticles
Publisher: Wiley
Date: 08-01-2012
DOI: 10.1002/PIP.1237
Selective epitaxial growth using dichlorosilane and silane by low pressure chemical vapor deposition
Publisher: Elsevier BV
Date: 06-2004
A high PSRR low dropout voltage regulator with fast settling response
Publisher: IEEE
Date: 10-2010
Plasmonic and biomimetic light-trapping for photovoltaics
Publisher: SPIE
Date: 20-08-2009
DOI: 10.1117/12.826087
Nanosphere lithography for improved absorption in thin crystalline silicon solar cells
Publisher: SPIE
Date: 22-12-2015
DOI: 10.1117/12.2202453
Influence of localized surface plasmon excitation in silver nanoparticles on the performance of silicon solar cells
Publisher: Elsevier BV
Date: 11-2009
Silicon–Germanium: Properties, Growth and Applications
Publisher: Springer US
Date: 2006
Etching techniques for realizing optical micro-cavity atom traps on silicon
Publisher: IOP Publishing
Date: 21-08-2004
Spectral tunability of plasmonic scattering by silver nanodiscs near a reflector
Publisher: SPIE
Date: 09-10-2012
DOI: 10.1117/12.956502
Rapid passivation of carrier-induced defects in p-type multi-crystalline silicon
Publisher: Elsevier BV
Date: 12-2016
Improved Optimization Strategy for Irradiance Equalization in Dynamic Photovoltaic Arrays
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 06-2013
Improved deposition of large scale ordered nanosphere monolayers via liquid surface self-assembly
Publisher: Elsevier BV
Date: 12-2009
Broadband plasmonic couplers for light trapping and waveguiding
Publisher: SPIE
Date: 30-04-2010
DOI: 10.1117/12.854425
ZnSe heteroepitaxy on GaAs (110) substrate
Publisher: Springer Science and Business Media LLC
Date: 02-1998
Nanostructured Gas Sensors: From Air Quality and Environmental Monitoring to Healthcare and Medical Applications
Publisher: MDPI AG
Date: 26-07-2021
DOI: 10.3390/NANO11081927
Abstract: In the last decades, nanomaterials have emerged as multifunctional building blocks for the development of next generation sensing technologies for a wide range of industrial sectors including the food industry, environment monitoring, public security, and agricultural production. The use of advanced nanosensing technologies, particularly nanostructured metal-oxide gas sensors, is a promising technique for monitoring low concentrations of gases in complex gas mixtures. However, their poor conductivity and lack of selectivity at room temperature are key barriers to their practical implementation in real world applications. Here, we provide a review of the fundamental mechanisms that have been successfully implemented for reducing the operating temperature of nanostructured materials for low and room temperature gas sensing. The latest advances in the design of efficient architecture for the fabrication of highly performing nanostructured gas sensing technologies for environmental and health monitoring is reviewed in detail. This review is concluded by summarizing achievements and standing challenges with the aim to provide directions for future research in the design and development of low and room temperature nanostructured gas sensing technologies.
Photovoltaic technologies
Publisher: Elsevier BV
Date: 12-2008
Planar chiral meta-materials for photonic devices
Publisher: Springer Science and Business Media LLC
Date: 2003
Broken Time Reversal of Light Interaction with Planar Chiral Nanostructures
Publisher: American Physical Society (APS)
Date: 09-12-2003
Crop type exerts greater influence upon rhizosphere phosphohydrolase gene abundance and phylogenetic diversity than phosphorus fertilization
Publisher: Oxford University Press (OUP)
Date: 20-02-2021
Abstract: Rock phosphate is an alternative form of phosphorus (P) fertilizer however, there is no information regarding the influence of P fertilizer sources in Brazilian Cerrado soils upon microbial genes coding for phosphohydrolase enzymes in crop rhizospheres. Here, we analyze a field experiment comparing maize and sorghum grown under different P fertilization (rock phosphate and triple superphosphate) upon crop performance, phosphatase activity and rhizosphere microbiomes at three levels of ersity: small subunit rRNA marker genes of bacteria, archaea and fungi a suite of alkaline and acid phosphatase and phytase genes and ecotypes of in idual genes. We found no significant difference in crop performance between the fertilizer sources, but the accumulation of fertilizer P into pools of organic soil P differed. Phosphatase activity was the only biological parameter influenced by P fertilization. Differences in rhizosphere microbiomes were observed at all levels of bio ersity due to crop type, but not fertilization. Inspection of phosphohydrolase gene ecotypes responsible for differences between the crops suggests a role for lateral genetic transfer in establishing ecotype distributions. Moreover, they were not reflected in microbial community composition, suggesting that they confer competitive advantage to in idual cells rather than species in the sorghum rhizosphere.
Ionoluminescence in the Helium Ion Microscope
Publisher: Oxford University Press (OUP)
Date: 12-2012
DOI: 10.1017/S1431927612013463
Abstract: Ionoluminescence (IL) is the emission of light from a material due to excitation by an ion beam. In this work, a helium ion microscope (HIM) has been used in conjunction with a luminescence detection system to characterize IL from materials in an analogous way to how cathodoluminescence (CL) is characterized in a scanning electron microscope (SEM). A survey of the helium ion beam induced IL characteristics, including images and spectra, of a variety of materials known to exhibit CL in an SEM is presented. Direct band-gap semiconductors that luminesce strongly in the SEM are found not do so in the HIM, possibly due to defect-related nonradiative pathways created by the ion beam. Other materials do, however, exhibit IL, including a cerium-doped garnet s le, quantum dots, and rare-earth doped LaPO 4 nanocrystals. These emissions are a result of transitions between f electron states or transitions across size dependent band gaps. In all these s les, IL is found to decay with exposure to the beam, fitting well to double exponential functions. In an exploration of the potential of this technique for biological tagging applications, imaging with the IL emitted by rare-earth doped LaPO 4 nanocrystals, simultaneously with secondary electron imaging, is demonstrated at a range of magnifications.
Efficient light harvesting in hybrid quantum dot–interdigitated back contact solar cells via resonant energy transfer and luminescent downshifting
Publisher: Royal Society of Chemistry (RSC)
Date: 2019
DOI: 10.1039/C9NR04003J
Abstract: In this paper,we propose a hybrid quantum dot (QD)/Solar cell configuration to improve the performance of IBC silicon solar cells through efficient utilisation of resonant energy transfer (RET) and luminescent downshifting (LDS).
(Dark Line Defects, Bright Line Lasers)‐Microscopic Studies of Single‐Shot Lasing in CdSe Quantum Wells
Publisher: Wiley
Date: 02-1995
Planar chiral meta-materials: controlling the polarization state of light in the far- and near- field
Publisher: IEEE
Date: 2003
Planar chiral meta-materials for optical applications
Publisher: Elsevier BV
Date: 06-2004
Large area all-dielectric planar chiral metamaterials by electron beam lithography
Publisher: American Vacuum Society
Date: 05-2006
DOI: 10.1116/1.2201454
Abstract: All-dielectric optically active planar chiral metamaterials have been fabricated by electron beam lithography. We have demonstrated the effectiveness of a polymeric charge dispersion layer in dramatically reducing charge buildup during the exposure of chemically lified resists on dielectric substrates. This technique has allowed the fabrication of large-area high density planar chiral structures with sub-200nm resolutions and stitching accuracy. A significant change in the polarization state of visible light transmitted from patterned surfaces is observed, including a maximum 9° change in ellipticity and 22° change in polarization azimuth rotation. These effects are shown to be dependent on the sense of chirality of the surface and the input polarization state of the light. Furthermore, we have also demonstrated that these dielectric planar chiral surfaces, with enantiomeric chiral designs, show a strong modulation in the intensity of the diffracted beams. These optical activities could make these surfaces particularly promising candidates for the development of integrable solid-state polarization sensitive devices.
Comment on ‘‘Vertical-cavity stimulated emission from photopumped InGaN/GaN heterojunctions at room temperature’’ [Appl. Phys. Lett. 65, 520 (1994)]
Publisher: AIP Publishing
Date: 27-05-1996
DOI: 10.1063/1.116057
Simulation platform for dynamic photovoltaic arrays
Publisher: IEEE
Date: 09-2013
An advanced software suite for the processing and analysis of silicon luminescence images
Publisher: Elsevier BV
Date: 06-2017
Tunable Low-loss Plasmonic Mirror for Diffuse Optical Scattering
Publisher: IOP Publishing
Date: 30-11-2012
Near-field polarization conversion in planar chiral nanostructures
Publisher: Elsevier BV
Date: 11-2005
Focused helium ion beam milling and deposition
Publisher: Elsevier BV
Date: 08-2011
Lateral SiGe heterojunction bipolar transistor by confined selective epitaxial growth: simulation and material growth
Publisher: Elsevier BV
Date: 06-2004
Growth and characterization of beryllium-based II–VI compounds
Publisher: AIP Publishing
Date: 1999
DOI: 10.1063/1.369479
Abstract: We report on the growth and characterization of beryllium–chalcogenide layers prepared on GaAs (100) by molecular beam epitaxy. Be- and Te-terminated BeTe surfaces show (4×1) and (2×1) reconstructions, respectively. The stability of each surface is investigated by reflection high energy electron diffraction as a function of substrate temperature. The dependence of growth rate of BeTe on growth temperature and Be cell temperature is investigated. The best full width at half maximum (FWHM) of a (400) x-ray rocking curve of BeTe is 78 arcsec. The dependence of the ZnBeSe energy gap on Be composition is obtained by four-crystal x-ray diffraction (XRD) and low temperature photoluminescence measurements. The energy gap of Zn1−xBexSe varies as Eg=0.0107x+2.790 (eV) for small Be composition (x& .25) at 77 K. Lattice-matched ZnBeSe (Eg=2.82 eV) and ZnMgBeSe (Eg=2.975 eV) layers show narrower XRD peaks, the FWHM values of which are 64 and 21 arcsec, respectively. The variation of FWHM of x-ray rocking curve due to lattice misfit is investigated for ZnMgBeSe quaternaries with various lattice misfits extending from compressive to tensile strain. The FWHM value under compressive strain increases more steeply with lattice misfit than that under tensile strain.
Reflectance properties of silicon moth-eyes in response to variations in angle of incidence, polarisation and azimuth orientation
Publisher: The Optical Society
Date: 18-02-2014
DOI: 10.1364/OE.22.00A402
Self-assembled germanium islands grown on (001) silicon substrates by low-pressure chemical vapor deposition
Publisher: Springer Science and Business Media LLC
Date: 2003
Raised source/drains for 50nm MOSFETs using a silane/dichlorosilane mixture for selective epitaxy
Publisher: Elsevier BV
Date: 04-2005
HELICS cell: Laser-cut grooves to create a high-efficiency, low-cost IBC solar cell
Publisher: IEEE
Date: 06-2014
On cooling/heating mechanisms in a self-cooled light-emitting diode with type-II band offset
Publisher: AIP Publishing
Date: 09-01-2019
DOI: 10.1063/1.5063849
Abstract: A p+-i-n+ self-cooled light-emitting diode with type-II band offset is numerically simulated in one-dimension to examine the underlying cooling/heating mechanisms. The Peltier effect is confirmed to be the dominant cooling mechanism under forward bias, even when the carriers are injected without an energy barrier. Meanwhile, Joule heating in the active layer is identified as the main heating mechanism for bandgaps below 0.52 eV under an ultra-low forward bias. In contrast to non-radiative recombination, electroluminescence itself is found to be a cooling mechanism, producing most photons above the bandgap of the active layer. However, this effect only becomes noticeable under an ultra-low bias in very small bandgap materials. While it is desirable to inject more carriers to leverage larger band offsets for a higher cooling power, Joule heating limits the maximum cooling power achievable. With small band offsets (& .21 eV), a reverse bias instead of a forward bias may become the best cooling condition, where non-radiative generation processes are discovered to be the dominant cooling mechanisms.
The Effects of Varied Deposition Conditions, Including the Use of Argon, on Thin-Film Silicon Solar Cells Prepared using PECVD
Publisher: Informa UK Limited
Date: 04-03-2014
Acceleration and mitigation of carrier-induced degradation in p-type multi-crystalline silicon
Publisher: Wiley
Date: 20-01-2016
A new polarimeter based on optical non-reciprocity in gratings with two-dimensional chirality
Publisher: Springer Science and Business Media LLC
Date: 19-05-2010
Downscaled graphene nanodevices: Fabrication and ab initio study
Publisher: IEEE
Date: 10-2012
Broadband wavelength and angle-resolved scattering characterization for nanophotonics investigations
Publisher: Optica Publishing Group
Date: 12-08-2015
DOI: 10.1364/AO.54.007224
Luminescence imaging and spectroscopy of rare earth doped lanthanum nanoparticles in a helium ion microscope
Publisher: Oxford University Press (OUP)
Date: 07-2012
DOI: 10.1017/S1431927612005909
Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2012 in Phoenix, Arizona, USA, July 29 – August 2, 2012.
A new model of geometric chirality for two-dimensional continuous media and planar meta-materials
Publisher: IOP Publishing
Date: 24-11-2003
Silicon electro-optic switch based on n-ZnO/p-Si heterojunction structure
Publisher: IEEE
Date: 09-2011
A Detailed Study of P-N Junction Solar Cells by Means of Collection Efficiency
Publisher: IEEE
Date: 2006
A high PSRR capacitor-less on — Chip low dropout voltage regulator
Publisher: IEEE
Date: 09-2010
Design of a 3μm pixel linear CMOS sensor for earth observation
Publisher: Elsevier BV
Date: 10-2003
Si/SiGe near-infrared photodetectors grown using low pressure chemical vapour deposition
Publisher: Springer Science and Business Media LLC
Date: 05-06-2007
Confined epitaxial growth by low-pressure chemical vapor deposition
Publisher: Springer Science and Business Media LLC
Date: 2003
Room Temperature Stimulated Emission and ZnO‐Based Lasers
Publisher: Wiley
Date: 25-03-2011
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