A5081428881- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- TiO2 Photocatalysis and Solar Cells
- Organic Electronics and Photovoltaics
- Advanced Photocatalysis Techniques
- Organic Light-Emitting Diodes Research
- Optical properties and cooling technologies in crystalline materials
- 2D Materials and Applications
- solar cell performance optimization
- Transition Metal Oxide Nanomaterials
- ZnO doping and properties
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced battery technologies research
- Organic and Molecular Conductors Research
- Thin-Film Transistor Technologies
- Magnetic and transport properties of perovskites and related materials
- Silicon and Solar Cell Technologies
- Luminescence Properties of Advanced Materials
- Thermal Expansion and Ionic Conductivity
- Gas Sensing Nanomaterials and Sensors
- Advancements in Solid Oxide Fuel Cells
University of Oxford
2016-2025
Clarendon College
2014-2025
Technical University of Munich
2024
Institute for Advanced Study
2024
University of Southampton
2024
Griffith University
2023
Universidade de São Paulo
2023
Massachusetts Institute of Technology
2015-2023
Friedrich-Alexander-Universität Erlangen-Nürnberg
2023
University of Toronto
2023
Perovskite Photovoltaics For many types of low-cost solar cells, including those using dye-sensitized titania, performance is limited by low open-circuit voltages. Lee et al. (p. 643 , published online 4 October; see the Perspective Norris and Aydil ) have developed a solid-state cell in which structured films titania or alumina nanoparticles are solution coated with lead-halide perovskite layer that acts as absorber n-type photoactive layer. These particles spirobifluorene organic-hole...
Organic-inorganic perovskites have shown promise as high-performance absorbers in solar cells, first a coating on mesoporous metal oxide scaffold and more recently solid layer planar heterojunction architectures. Here, we report transient absorption photoluminescence-quenching measurements to determine the electron-hole diffusion lengths, constants, lifetimes mixed halide (CH3NH3PbI(3-x)Cl(x)) triiodide (CH3NH3PbI3) perovskite absorbers. We found that lengths are greater than 1 micrometer...
Perovskite-based solar cells have attracted significant recent interest, with power conversion efficiencies in excess of 15% already superceding a number established thin-film cell technologies. Most work has focused on methylammonium lead trihalide perovskites, bandgaps ∼1.55 eV and greater. Here, we explore the effect replacing cation this perovskite, show that slightly larger formamidinium cation, can synthesise perovskites bandgap tunable between 1.48 2.23 eV. We take eV-bandgap...
Organolead trihalide perovskites are shown to exhibit the best of both worlds: charge-carrier mobilities around 10 cm2 V−1 s−1 and low bi-molecular charge-recombination constants. The ratio two is found defy Langevin limit kinetic charge capture by over four orders magnitude. This mechanism causes long (micrometer) charge-pair diffusion lengths crucial for flat-heterojunction photovoltaics.
Metal halide perovskite photovoltaic cells could potentially boost the efficiency of commercial silicon modules from ∼20 toward 30% when used in tandem architectures. An optimum cell optical band gap ~1.75 electron volts (eV) can be achieved by varying composition, but to date, such materials have had poor photostability and thermal stability. Here we present a highly crystalline compositionally photostable material, [HC(NH2)2](0.83)Cs(0.17)Pb(I(0.6)Br(0.4))3, with an ~1.74 eV, fabricated...
Over the last 12 months, we have witnessed an unexpected breakthrough and rapid evolution in field of emerging photovoltaics, with realization highly efficient solid-state hybrid solar cells based on organometal trihalide perovskite absorbers. In this Perspective, steps that led to discovery are discussed, future rapidly advancing concept been considered. It is likely next few years research will advance technology very highest efficiencies while retaining lowest cost embodied energy....
Already exhibiting solar to electrical power conversion efficiencies of over 17%, organic–inorganic lead halide perovskite cells are one the most promising emerging contenders in drive provide a cheap and clean source energy. One concern however, is potential toxicology issue lead, key component archetypical material. The likely substitute tin, which like also group 14 metal. While tin perovskites have shown good semiconducting behaviour, instability its 2+ oxidation state has thus far...
Perovskite solar cells have rapidly risen to the forefront of emerging photovoltaic technologies, exhibiting rising efficiencies. This is likely continue rise, but in development these there are unusual characteristics that arisen, specifically an anomalous hysteresis current-voltage curves. We identify this phenomenon and show some examples factors make more or less extreme. also demonstrate stabilized power output under working conditions suggest a useful parameter present, alongside scan...
Going toward the grains Great strides have been made in improving efficiency of organic-inorganic perovskite solar cells. Further improvements are likely to depend on understanding role film morphology charge-carrier dynamics. de Quilettes et al. correlated confocal fluorescence microscopy images with those from scanning electron spatially resolve photoluminescence and carrier decay dynamics films perovskites. Carrier lifetimes varied widely even between grains, chemical treatments could...
Organometal trihalide perovskite based solar cells have exhibited the highest efficiencies to‐date when incorporated into mesostructured composites. However, thin solid films of a absorber should be capable operating at efficiency in simple planar heterojunction configuration. Here, it is shown that film morphology critical issue CH 3 NH PbI 3‐ x Cl cells. The carefully controlled by varying processing conditions, and demonstrated photocurrents are attainable only with surface coverages....
The vast majority of perovskite solar cell research has focused on organic–inorganic lead trihalide perovskites; herein, we present working inorganic CsPbI<sub>3</sub>perovskite cells for the first time.
The study of the photophysical properties organic–metallic lead halide perovskites, which demonstrate excellent photovoltaic performance in devices with electron- and hole-accepting layers, helps to understand their charge photogeneration recombination mechanism unravels potential for other optoelectronic applications. We report surprisingly high photoluminescence (PL) quantum efficiencies, up 70%, these solution-processed crystalline films. find that photoexcitation pristine CH3NH3PbI3–xClx...
We have reduced the processing temperature of bulk absorber layer in CH3NH3PbI3−xClx perovskite solar cells from 500 to <150 °C and achieved power conversion efficiencies up 12.3%. Remarkably, we find that devices with planar thin-film architecture, where ambipolar transports both holes electrons, convert absorbed photons into collected charge close 100% efficiency.
Organic–inorganic metal halide perovskites have recently emerged as a top contender to be used an absorber material in highly efficient, low-cost photovoltaic devices. Solution-processed semiconductors tend high density of defect states and exhibit large degree electronic disorder. Perovskites appear go against this trend, despite relatively little knowledge the impact defects, certified solar-to-electrical power conversion efficiencies up 17.9% been achieved. Here, through treatment crystal...
Highest reported efficiency cesium lead halide perovskite solar cells are realized by tuning the bandgap and stabilizing black phase at lower temperatures. CsPbI2Br is employed in a planar architecture device resulting 9.8% power conversion over 5% stabilized output. Offering substantially enhanced thermal stability their organic based counterparts, these results show that all-inorganic perovskites can represent promising next step for photovoltaic materials. As service to our authors...
The highest power conversion efficiencies (PCEs) reported for perovskite solar cells (PSCs) with inverted planar structures are still inferior to those of PSCs regular structures, mainly because lower open-circuit voltages (Voc). Here we report a strategy reduce nonradiative recombination the devices, based on simple solution-processed secondary growth technique. This approach produces wider bandgap top layer and more n-type film, which mitigates recombination, leading an increase in Voc by...