A5030085518- Perovskite Materials and Applications
- Quantum Dots Synthesis And Properties
- Advanced Photocatalysis Techniques
- Solid-state spectroscopy and crystallography
- Chalcogenide Semiconductor Thin Films
- Conducting polymers and applications
- Optical properties and cooling technologies in crystalline materials
- Semiconductor materials and devices
- Semiconductor Quantum Structures and Devices
- Electronic and Structural Properties of Oxides
- Organic Electronics and Photovoltaics
- Advanced Battery Materials and Technologies
- Nanowire Synthesis and Applications
- Gas Sensing Nanomaterials and Sensors
- Nanocluster Synthesis and Applications
- Luminescence Properties of Advanced Materials
- X-ray Diffraction in Crystallography
- Polyoxometalates: Synthesis and Applications
- Advanced Nanomaterials in Catalysis
- Crystallization and Solubility Studies
- Magnetic and transport properties of perovskites and related materials
- CO2 Reduction Techniques and Catalysts
- Fuel Cells and Related Materials
- Membrane-based Ion Separation Techniques
- Semiconductor materials and interfaces
The University of Queensland
2022-2025
KU Leuven
2016-2024
IMEC
2021
University of California, Berkeley
2020-2021
VIB-KU Leuven Center for Microbiology
2018
University of Wollongong
2011-2016
Defence Scientific Information & Documentation Centre
2011
Motorola (United States)
2002
Metal-halide perovskites have rapidly emerged as one of the most promising materials 21st century, with many exciting properties and great potential for a broad range applications, from photovoltaics to optoelectronics photocatalysis. The ease which metal-halide can be synthesized in form brightly luminescent colloidal nanocrystals, well their tunable intriguing optical electronic properties, has attracted researchers different disciplines science technology. In last few years, there been...
Abstract Lead‐free double perovskites have great potential as stable and nontoxic optoelectronic materials. Recently, Cs 2 AgBiBr 6 has emerged a promising material, with suboptimal photon‐to‐charge carrier conversion efficiency, yet well suited for high‐energy photon‐detection applications. Here, the structural properties of pure alkali‐metal‐substituted (Cs 1− x Y ) (Y: Rb + , K Na ; = 0.02) single crystals are investigated. Strikingly, alkali‐substitution entails tunability to material...
Strain-stabilized perovskites The perovskite materials used for solar cells and light-emitting diodes (which are black in color) generally less stable at room temperature than the electronically inactive nonperovskite phases yellow color). Steele et al. show that CsPbI 3 , strain induced a thin film after annealing material to 330°C then rapidly cooling it kinetically trapped phase. Grazing-incidence wide-angle x-ray scattering revealed crystal distortions texture formation created by...
The development of green, sustainable, and economical chemical processes represents a cornerstone challenge within chemistry today. Semiconductor heterogeneous photocatalysis is currently utilized wide variety societally impactful processes, spanning reactions such as hydrogen production CO2 conversion, to the organic transformation raw materials for value-added chemicals. Metal halide perovskites (MHPs) have recently emerged new promising class cheap easy make photocatalytic semiconductors,...
The recent surge of scientific interest for lead halide perovskite semiconductors and optoelectronic devices has seen a mix materials science sub-fields converge on the same “magical” crystal structure.
Silicon solar cells are approaching their theoretical efficiency limit of 29%. This limitation can be exceeded with advanced device architectures, where two or more stacked to improve the harvesting energy. In this work, we devise a tandem perovskite layer conformally coated on silicon bottom cell featuring micrometric pyramids—the industry standard—to its photocurrent. Using an additive in processing sequence, regulate crystallization process and alleviate recombination losses occurring at...
The impressive optoelectronic performance and low production cost of metal halide perovskites have inspired applications well beyond efficient solar cells. Herein, we widen the materials engineering options available for selective photocatalytic oxidation benzylic alcohols, an industrially significant reaction, using formamidinium lead bromide (FAPbBr3) other perovskite-based materials. best was obtained a FAPbBr3/TiO2 hybrid photocatalyst under simulated illumination. Detailed optical...
The room-temperature charge carrier mobility and excitation-emission properties of metal halide perovskites are governed by their electronic band structures intrinsic lattice phonon scattering mechanisms. Establishing how carriers interact within this scenario will have far-reaching consequences for developing high-efficiency materials optoelectronic applications. Herein we evaluate the conduction environment double perovskite Cs2AgBiBr6 via a combinatorial approach; single crystal X-ray...
Metal halide perovskites with direct band gap and strong light absorption are promising materials for harvesting solar energy; however, their relatively narrow limits redox ability when used as a photocatalyst. Adding second semiconductor component the appropriate structure offsets can generate Z-scheme photocatalytic system, taking full advantage of perovskite's intrinsic properties. In this work, we develop photocatalyst based on formamidinium lead bromide bismuth tungstate...
The sensitive detection of X-rays embodies an important research area, being motivated by a common desire to minimize the radiation doses required for detection. Among metal halide perovskites, double-perovskite Cs2 AgBiBr6 system has emerged as promising candidate X-rays, capable high X-ray stability and sensitivity (105 μC Gy-1 cm-2 ). Herein, photophysical pathways in single-crystal are detailed at both room (RT) liquid-nitrogen (LN2 T) temperatures, with emphasis made toward...
Defect engineering in photocatalysts represents a fundamental method toward tailoring their solar-to-chemical energy conversion performance, although determining the nature and impact of subsurface defects remains challenging. Single-unit-cell Bi2WO6 monolayers, forming sandwich-like structure, [BiO]+–[WO4]2––[BiO]+, exhibit promising photocatalytic performance are an ideal system for isolating defects. We report single-step synthesis monolayers rich stable interior W vacancies characterize...
Abstract Organic solar cells (OSCs) have experienced rapid progress with the innovation of near‐infrared (NIR)‐absorbing small‐molecular acceptors (SMAs), while unique electronic properties SMAs raise new challenges in relation to cathode engineering for effective electron collection. To address this issue, two fluorinated perylene‐diimides (PDIs), PDINN‐F and PDINN‐2F, are synthesized by a simple fluorination method, application as interlayer (CIL) materials. The bay‐fluorinated PDI‐based...
Abstract For polymer solar cells (PSCs), the mixture of donors and small‐molecule acceptors (SMAs) is fine‐tuned to realize a favorable kinetically trapped morphology thus commercially viable device efficiency. However, thermodynamic relaxation mixed domains within blend raises concerns related long‐term operational stability devices, especially in record‐holding Y‐series SMAs. Here, new class dimeric Y6‐based SMAs tethered with differential flexible spacers reported regulate their...
Abstract The frequency of reports utilizing synchrotron‐based grazing incident wide angle X‐ray scattering (GIWAXS) to study metal halide perovskite thin films has exploded recently, as this technique proven invaluable for understanding several structure‐property relationships that fundamentally limit optoelectronic performance. GIWAXS geometry and temporal resolution are also inherently compatible with in situ operando setups (including ISOS protocols), a relatively large research community...
Metal nanoparticle (NP) cocatalysts are widely investigated for their ability to enhance the performance of photocatalytic materials; however, practical application is often limited by inherent instability under light irradiation. This challenge has catalyzed interest in exploring high-entropy alloys (HEAs), which, with increased entropy and lower Gibbs free energy, provide superior stability. In this study, 3.5 nm-sized noble-metal-free NPs composed a FeCoNiCuMn HEA successfully...
Abstract The primary performance limitation in inverted perovskite‐based solar cells is the interface between fullerene‐based electron transport layers and perovskite. Atomic layer deposited thin aluminum oxide (AlO X ) interlayers that reduce nonradiative recombination at perovskite/C 60 are developed, resulting >60 millivolts improvement open‐circuit voltage 1% absolute power conversion efficiency. Surface‐sensitive characterizations indicate presence of a thin, conformally AlO x layer,...
Inspired by efficient perovskite solar cells, we developed a three-component hybrid perovskite-based photocatalyst cell, NiOx/FAPbBr3/TiO2, for C(sp3)–H bond activation with high selectivity (∼90%) and conversion rates (3800 μmol g–1 h–1) under ambient conditions. Time-resolved spectroscopy on our photocatalytic cell reveals exciton dissociation charge separation, where TiO2 NiOx serve as the electron- hole-transporting layers, respectively. The photogenerated carriers injected into drive...
Abstract Halide perovskites possess enormous potential for various optoelectronic applications. Presently, a clear understanding of the interplay between lattice and electronic effects is still elusive. Specifically, weakly absorbing tail states dual emission from are not satisfactorily described by existing theories based on Urbach reabsorption effect. Herein, through temperature-dependent time-resolved spectroscopy metal halide perovskite single crystals with organic or inorganic A-site...
The extraordinary properties of lead-halide perovskite materials have spurred intense research, as they a realistic perspective to play an important role in future photovoltaic devices. It is known that these undergo number structural phase transitions function temperature markedly alter their optical and electronic properties. precise transition exact crystal structure each phase, however, are controversially discussed the literature. linear thermal expansion single crystals APbX3 (A =...
ConspectusA new generation of semiconducting materials based on metal halide perovskites has recently been launched into the scientific spotlight, exhibiting outstanding optoelectronic properties and providing promise for development efficient optical devices. As a vivid example, solar cells made from these have quickly reached conversion efficiencies exceeding 25%, now par with well-established technologies, like silicon. Their widespread success is due, in part, to unique ability retain...
Mixed-halide CsPbI2Br perovskite is promising for efficient and thermally stable all-inorganic solar cells; however, the use of conventional antisolvent methods additives-based hole-transporting layers (HTLs) currently hampers progress. Here, we have employed hot-air-assisted deposition in ambient condition to obtain high-quality photoactive films extended device operation using metal cation doping dopant-free materials. Density functional theory calculations are used study structural...
Abstract Molecular additives are widely utilized to minimize non-radiative recombination in metal halide perovskite emitters due their passivation effects from chemical bonds with ionic defects. However, a general and puzzling observation that can hardly be rationalized by alone is most of the molecular enabling high-efficiency light-emitting diodes (PeLEDs) chelating (multidentate) molecules, while respective monodentate counterparts receive limited attention. Here, we reveal largely...
We demonstrate a new case of materials-gene engineering to precisely design photocatalysts with the prescribed properties. Based on theoretical calculations, phase-doping strategy was proposed regulate pathways CO2 conversion over Au nanoparticles (NPs) loaded TiO2 photocatalysts. As result, thermodynamic bottleneck -to-CO is successfully unlocked by incorporation stable twinning crystal planes into face-centered cubic (fcc) phase NPs. Compared bare pristine , activity results showed that...