A5105411514- Photonic and Optical Devices
- Photonic Crystals and Applications
- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Quantum Dots Synthesis And Properties
- Optical Coatings and Gratings
- Plasmonic and Surface Plasmon Research
- Optical Network Technologies
- Functional Brain Connectivity Studies
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Fern and Epiphyte Biology
- Thin-Film Transistor Technologies
- Neural dynamics and brain function
- Organic Electronics and Photovoltaics
- Asphalt Pavement Performance Evaluation
- Infrastructure Maintenance and Monitoring
- Solid-state spectroscopy and crystallography
- Semiconductor Lasers and Optical Devices
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- Advanced Photonic Communication Systems
- Mechanical and Optical Resonators
- Silicon Nanostructures and Photoluminescence
Australian National University
2015-2024
Illumina (United States)
2023-2024
TeraView (United Kingdom)
2020-2024
University of Arkansas at Fayetteville
2013-2024
The University of Sydney
2002-2023
Sheffield Hallam University
2023
Freie Universität Berlin
2023
Swansea University
2023
Intermountain Medical Center
2023
Westmead Hospital
2023
We present a systematic procedure for designing "flat bands" of photonic crystal waveguides slow light propagation. The aims to maximize the group index - bandwidth product by changing position first two rows holes W1 line defect waveguides. A nearly constant is achieved indices 30-90 and as an example, we experimentally demonstrate flat band with 32.5, 44 49 over 14 nm, 11 nm 9.5 around 1550 respectively.
Rubidium (Rb) is explored as an alternative cation to use in a novel multication method with the formamidinium/methylammonium/cesium (Cs) system obtain 1.73 eV bangap perovskite cells negligible hysteresis and steady state efficiency high 17.4%. The study shows beneficial effect of Rb improving crystallinity suppressing defect migration material. light stability examined under continuous illumination 12 h improved upon addition Cs Rb. After several cycles light–dark, cell retains 90% its...
We describe a multipole method for calculating the modes of microstructured optical fibers. The uses expansion centered on each hole to enforce boundary conditions accurately and matches expansions with different origins by use addition theorems. also validate give representative results.
Abstract The performance of state‐of‐the‐art perovskite solar cells is currently limited by defect‐induced recombination at interfaces between the and electron hole transport layers. These defects, most likely undercoordinated Pb halide ions, must either be removed or passivated if cell efficiencies are to approach their theoretical limit. In this work, a universal double‐side polymer passivation introduced using ultrathin poly(methyl methacrylate) (PMMA) films. Very high‐efficiency (≈20.8%)...
Reducing interface recombination boosts the <italic>V</italic><sub>oc</sub> for perovskite solar cells.
Polymer passivation layers can improve the open-circuit voltage of perovskite solar cells when inserted at perovskite-charge transport layer interfaces. Unfortunately, many such are poor conductors, leading to a trade-off between quality (voltage) and series resistance (fill factor, FF). Here, we introduce nanopatterned electron that overcomes this by modifying spatial distribution form nanoscale localized charge pathways through an otherwise passivated interface, thereby providing both...
A perovskite/CIGS tandem configuration is an attractive and viable approach to achieve ultra-high efficiency cost-effective all-thin-film solar cell.
Plasmon-enhanced internal photoemission in metal-semiconductor Schottky junctions has recently been proposed as an alternative photocurrent mechanism for solar cells. Here, we identify and discuss the requirements efficient operation of such cells analyze their performance limits under standard illumination. We show that maximum efficiency limit is <8% even if perfect optical absorption can be achieved using plasmonic nanostructures. This results from fundamental electronic properties...
An innovative design for a monolithic perovskite/silicon tandem solar cell, featuring mesoscopic perovskite top subcell and high-temperature tolerant homojunction c-Si bottom subcell.
In addition to a good perovskite light absorbing layer, the hole and electron transport layers play crucial role in achieving high‐efficiency solar cells. Here, simple, one‐step, solution‐based method is introduced for fabricating high quality indium‐doped titanium oxide layers. It shown that indium‐doping improves both conductivity of layer band alignment at ETL/perovskite interface compared pure TiO 2 , boosting fill‐factor voltage Using optimized layers, steady‐state efficiency 17.9% CH 3...
A variety of unexpected characterization results exhibited by perovskite solar cells are linked to the presence mobile ions in active layer, as demonstrated detailed numerical device models.
Abstract Defect‐mediated carrier recombination at the interfaces between perovskite and neighboring charge transport layers limits efficiency of most state‐of‐the‐art solar cells. Passivation interfacial defects is thus essential for attaining cell efficiencies close to theoretical limit. In this work, a novel double‐sided passivation 3D films demonstrated with thin surface bulky organic cation–based halide compound forming 2D layered perovskite. Highly efficient (22.77%) mixed‐dimensional...
We describe the numerical verifications of a multipole formulation for calculating electromagnetic properties modes that propagate in microstructured optical fibers. illustrate application this to both real and imaginary parts propagation constant. compare its predictions with results recent measurements low-loss fiber investigate variations dispersion geometrical parameters. also show obeys appropriate symmetry rules these may be used improve computational speed.
We describe a multipole formulation that can be used for high-accuracy calculations of the full complex propagation constant microstructured optical fiber with finite number holes. show how imaginary part microstructure, which describes confinement losses not associated absorption, varies hole size, rings holes, and wavelength, give minimum holes required specific loss given parameters.
The symmetry of an optical waveguide determines its modal degeneracies. A fiber with rotational order higher than 2 has modes that either are nondegenerate and support the complete or twofold degenerate pairs lower symmetry. latter case applies to fundamental perfect microstructured fibers, guaranteeing such fibers not birefringent. We explore two numerical methods demonstrate their agreement these constraints.
We report nonlinear measurements on 80microm silicon photonic crystal waveguides that are designed to support dispersionless slow light with group velocities between c/20 and c/50. By launching picoseconds pulses into the comparing their output spectral signatures, we show how self phase modulation induced broadening is enhanced due light. Comparison of numerical simulations pulse propagation elucidates contribution various effects determine shape waveguide transfer function. In particular,...
We propose a simple physical model that predicts the optical properties of class microstructured waveguides consisting high-index inclusions surround low-index core. On basis this model, it is found large regime exists where transmission minima are determined by geometry individual inclusions. The locations these to be largely unaffected relative position As result insight difficult problem analyzing complex structures can reduced much simpler an inclusion in structure.
Switching light is one of the most fundamental functions an optical circuit. As such, switches are a major research topic in photonics, and many types have been realized. Most operate by imposing phase shift between two sections device to direct from port another, or switch it on off, constraint being that typical refractive index changes very small. Conventional solutions address this issue making long devices, thus increasing footprint, using resonant enhancement, reducing bandwidth. We...
We review the different types of dispersion engineered photonic crystal waveguides that have been developed for slow light applications. introduce group index bandwidth product (GBP) and loss per delay in terms dB ns − 1 as two key figures merit to describe such structures compare experimental realizations based on these figures. A outcome comparison is crystals performs well or better than coupled ring resonators.