A5037371364- Perovskite Materials and Applications
- Conducting polymers and applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Solid-state spectroscopy and crystallography
- Organic Electronics and Photovoltaics
- Organic Light-Emitting Diodes Research
- 2D Materials and Applications
- Optical and Acousto-Optic Technologies
- solar cell performance optimization
- Pigment Synthesis and Properties
- Semiconductor Quantum Structures and Devices
- TiO2 Photocatalysis and Solar Cells
Clarendon College
2015-2025
University of Oxford
2016-2025
Monash University
2019-2024
SLAC National Accelerator Laboratory
2023
National Renewable Energy Laboratory
2023
Australian Regenerative Medicine Institute
2019-2022
Clayton Foundation
2019-2020
Australian Research Council
2020
Oxfam
2016-2018
Science Oxford
2015
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...
Tandem perovskite cells The ready processability of organic-inorganic materials for solar should enable the fabrication tandem cells, in which top layer is tuned to absorb shorter wavelengths and lower remaining longer-wavelength light. difficulty making an all-perovskite cell finding a material that absorbs red end spectrum. Eperon et al. developed infrared-absorbing mixed tin-lead can deliver 14.8% efficiency on its own 20.3% four-terminal cell. Science , this issue p. 861
A major bottleneck delaying the further commercialization of thin-film solar cells based on hybrid organohalide lead perovskites is interface loss in state-of-the-art devices. We present a generic architecture that combines solution-processed, reliable, and cost-efficient hole-transporting materials without compromising efficiency, stability, or scalability perovskite cells. Tantalum-doped tungsten oxide (Ta-WO x )/conjugated polymer multilayers offer surprisingly small barrier form...
We establish compositional effects on stability, crystallinity, charge-carrier life times and mobilities in mixed-cation lead iodide-bromide perovskites as band gap tunable materials for multi-junction photovoltaic cells.
“Compact layer-free” perovskite devices yield negligible stabilised power output, in comparison to those with charge selective contacts, elucidating mechanism for hysteresis.
The loss from halide-segregation in wide bandgap perovskite solar cells is quantified, revealing that the performance bottleneck currently is, fact, non-radiative recombination.
The meteoric rise of the field perovskite solar cells has been fueled by ease with which a wide range high‐quality materials can be fabricated via simple solution processing methods. However, to date, little effort devoted understanding precursor solutions, and role additives such as hydrohalic acids upon film crystallization final optoelectronic quality. Here, direct link between colloids concentration present in [HC(NH 2 ) ] 0.83 Cs 0.17 Pb(Br 0.2 I 0.8 3 nucleation growth stages thin...
Air-stable doping of the n-type fullerene layer in an n-i-p planar heterojunction perovskite device is capable enhancing efficiency and improving stability. Employing a (HC(NH2 )2 )0.83 Cs0.17 Pb(I0.6 Br0.4 )3 as photoactive layer, glass-glass laminated devices are reported, which sustain 80% their "post burn-in" over 3400 h under full sun illumination ambient conditions.
An understanding of the factors driving halide segregation in lead mixed-halide perovskites is required for their implementation tandem solar cells with existing silicon technology. Here we report that dynamics observed photoluminescence from CH3NH3Pb(Br0.5I0.5)3 strongly influenced by atmospheric environment, and encapsulation films a layer poly(methyl methacrylate) allows to be fully reversible repeatable. We further establish an empirical model directly linking amount fraction charge...
In this work, we demonstrate that time-resolved photoluminescence data of metal halide perovskites can be effectively evaluated by combining Bayesian inference with a Markov-chain Monte-Carlo algorithm and physical model. This approach enables us to infer high number parameters govern the performance perovskite-based devices, alongside probability distributions those parameters, as well correlations among all parameters. Via studying set halfstacks, comprising electron- hole-transport...
Many optoelectronic properties have been reported for lead halide perovskite polycrystalline films. However, ambiguities in the evaluation of these remain, especially long-range lateral charge transport, where ionic conduction can complicate interpretation data. Here we demonstrate a new technique to measure carrier mobility such materials. We combine quasi-steady-state photo-conductivity measurements (electrical probe) with photo-induced transmission and reflection (optical simultaneously...
Abstract To date, the most efficient perovskite solar cells (PSCs) employ an n–i–p device architecture that uses a 2,2′,7,7′‐tetrakis( N , ‐di‐p‐methoxyphenyl‐amine)‐9,9′‐spirobifluorene (spiro‐OMeTAD) hole‐transporting material (HTM), which achieves optimum conductivity with addition of lithium bis(trifluoromethane)sulfonimide (LiTFSI) and air exposure. However, this additive along its oxidation process leads to poor reproducibility is detrimental stability. Herein, dicationic salt...
The power-conversion efficiency of perovskite solar cells has soared up to 22.1% earlier this year. Within merely five years, the cell can now compete on with inorganic thin-film technologies, making it most promising new, emerging photovoltaic technologies. next grand challenge is aspect stability. hydrophilicity and volatility organic methylammonium makes work-horse material lead iodide vulnerable degradation through humidity heat. Additionally, ultraviolet radiation oxygen constitute...
The photo-stability of MAPbI<sub>x</sub>Br<sub>3−x</sub> is systematically studied by <italic>in situ</italic> photoluminescence and Raman spectroscopy to reveal the phase segregation/decomposition process.
For the first time, formamidinium–caesium perovskite thin films were successfully synthesised from a lead acetate-based precursor. Efficient solar cells (21.0%) and modules (18.8%) have been produced using blade coating techniques.
Perovskite solar cells have shown phenomenal progress and great potential to be manufactured as low‐cost large area modules. However, perovskite films often suffer from pinholes the resulting contact between hole‐ electron transporting layers provides lower resistance (shunt) pathways, leading decreased open‐circuit voltage fill factor. This problem is even more severe in especially case of neutral color semitransparent cells, where a absorber‐free required provide desired transparency....
Raman spectroscopy is a powerful technique for the study of materials chemistry and nanostructure. This nondestructive highly sensitive to molecular crystal lattice vibrations, which allow comprehensive vibrational modes molecules incorporated in photovoltaic perovskite materials. In this study, we apply FAPbX3 (X = Cl, Br, I) FAxMA1–xPbI3 (FA stands formamidinium; MA methylammonium) metal halide single crystals discuss necessary conditions obtain reliable data. We establish correlation...
Abstract Organic–inorganic perovskite solar cells (PSCs) are promising candidates for next‐generation, inexpensive panels due to their commercially competitive cost and high power conversion efficiencies. However, PSCs suffer from poor stability. A new vast subset of PSCs, quasi‐two‐dimensional Ruddlesden–Popper (quasi‐2D RP PSCs), has improved photostability superior resilience environmental conditions compared three‐dimensional metal‐halide PSCs. To accelerate the search quasi‐2D this work...
Electron-transport-layer-free (ETL-free) perovskite solar cells (PSCs) show great promise for commercialization due to their simple design and ease of fabrication. However, the interface between transparent conductive oxides such as indium-doped tin oxide (ITO) is not optimal differences in work functions, surface defects, wettability substrates. Surface modification ITO through self-assembled monolayers (SAMs) get ITO/SAM charge selective layers has shown improvement device performance...