A5072545431- Perovskite Materials and Applications
- Chalcogenide Semiconductor Thin Films
- Quantum Dots Synthesis And Properties
- Conducting polymers and applications
- Solid-state spectroscopy and crystallography
- Silicon and Solar Cell Technologies
- Thin-Film Transistor Technologies
- Organic Electronics and Photovoltaics
- Semiconductor materials and interfaces
- 2D Materials and Applications
- Integrated Circuits and Semiconductor Failure Analysis
- Copper-based nanomaterials and applications
- Photovoltaic System Optimization Techniques
- Organic Light-Emitting Diodes Research
- Terahertz technology and applications
- Electron and X-Ray Spectroscopy Techniques
- Coral and Marine Ecosystems Studies
- Ammonia Synthesis and Nitrogen Reduction
- Thermal Expansion and Ionic Conductivity
- Advanced Chemical Physics Studies
- Ion-surface interactions and analysis
- Organic and Molecular Conductors Research
- Photovoltaic Systems and Sustainability
- Advanced materials and composites
- Advanced Optical Sensing Technologies
UNSW Sydney
2015-2024
Helmholtz-Zentrum Berlin für Materialien und Energie
2023-2024
ARC Centre of Excellence in Advanced Molecular Imaging
2015-2023
Australian Centre for Advanced Photovoltaics
2015-2016
The University of Sydney
2016
Monash University
2016
University of Borås
2012-2014
The critical role of grain boundaries for (CH(NH2)2PbI3)0.85(CH3NH3PbBr3)0.15 perovskite solar cells studied by Kelvin probe force microscopy under bias voltage and illumination is reported. Ion migration enhanced at the boundaries. Under illumination, light-induced potential causes ion leading to a rearranged distribution. Such distribution favors photogenerated charge-carrier collection As service our authors readers, this journal provides supporting information supplied authors. materials...
Over the last several years, organic–inorganic lead halide perovskites have rapidly emerged as a new photovoltaic contender. Although energy conversion efficiency above 20% has now been certified, improved understanding of material properties contributing to these high performance levels may allow progression even higher efficiency, stable cells. The optical materials are important not only device design but also because insight they provide into less directly accessible properties,...
In this work, we report the benefits of incorporating phenethylammonium cation (PEA+) into (HC(NH2)2PbI3)0.85(CH3NH3PbBr3)0.15 perovskite for first time. After adding small amounts PEA (<10%), film morphology is changed but, most importantly, grain boundaries are passivated. This supported by Kelvin Probe Force Microscopy (KPFM). The passivation results in increase photoluminescence intensity and carrier lifetimes test structures open-circuit voltages (VOC) devices as long addition PEA+...
Abstract Layered low‐dimensional perovskite structures employing bulky organic ammonium cations have shown significant improvement on stability but poorer performance generally compared to their 3D counterparts. Here, a mixed passivation (MP) treatment is reported that uses mixture of iodide ( iso ‐butylammonium iodide, i BAI) and formammidinium (FAI), enhancing both power conversion efficiency stability. Through combination inactivation the interfacial trap sites, characterized by...
For the first time, we report large-area (16 cm2) independently certified efficient single perovskite solar cells (PSCs) by overcoming two challenges associated with cells. The challenge of realizing a homogeneous and densely packed film over large area is overcome using an antisolvent spraying process. second removing series resistance limitation transparent conductor incorporating metal grid designed semidistributed diode model. A 16 cm2 device at cell level rather than module demonstrated...
The last 4 years have seen the rapid emergence of a new solar cell technology based on organic-inorganic lead halide perovskites, primarily CH3NH3PbI3 and related halides involving Cl Br. Debate continues role excitons free carriers in these materials. Recent studies report values exciton binding energy for iodide ranging from 0.7 meV to 200 meV, with vastly different implications device operation design. In present work, previously neglected polarons are shown likely major impact...
Abstract Organic–inorganic metal halide perovskites have gained considerable attention for next-generation photovoltaic cells due to rapid improvement in power conversion efficiencies. However, fundamental understanding of underlying mechanisms related light- and bias-induced effects at the nanoscale is still required. Here, structural variations induced by light bias are systematically investigated using scanning probe microscopy techniques. We show that periodically striped ferroelastic...
Abstract Long‐chain organic halide salts are widely used in perovskite‐based optoelectronic devices for surface passivation owing to their capability interact with the defects of perovskites. Here, aluminum oxide (AlO x ) is introduced via atomic layer deposition onto octylammonium iodide (OAI) exploit benefits without generating undesired defects. The incorporating AlO on OAI‐treated perovskite (OAI/AlO show enhancement both device performance and photo‐stability compared those only...
HC(NH2)2PbI3 perovskite solar cells have emerged as a promising alternative to CH3NH3PbI3 due their better thermal stability and lower bandgap. In this work, we demonstrated reliable fabrication technique for planar by controlling nucleation crystallization processes of the layer through combination gas-assisted spin coating addition HI additive in precursor. A narrow distribution power conversion efficiencies (PCEs) can be achieved with an average 13% negligible hysteresis when measured at...
Abstract Fast camera‐based luminescence‐imaging measurements on perovskite solar cells are presented. The fundamental correlation between the luminescence intensity and open circuit voltage predicted by generalised Planck law is confirmed, enabling various quantitative methods for detection of efficiency‐limiting defects to be applied this new cell structure. Interstinegly, it found that valid only light‐soaked devices. Copyright © 2015 John Wiley & Sons, Ltd.
Mixed organic-inorganic halide perovskites have emerged as a promising new class of semiconductors for photovoltaics with excellent light harvesting properties. Thorough understanding the optical properties these materials is important photovoltaic device optimization and insight this provides knowledge energy band structures. Here we present an investigation sub-room temperature dependent polycrystalline thin films CH3NH3PbI3 that are increasing interest photovoltaics. The complex...
The current work reports the lithium (Li) doping of a low-temperature processed zinc oxide (ZnO) electron transport layer (ETL) for highly efficient, triple-cation-based MA0.57FA0.38Rb0.05PbI3 (MA: methylammonium, FA: formamidinium, Rb: rubidium) perovskite solar cells (PSCs). Lithium intercalation in host ZnO lattice structure is dominated by interstitial phenomena, which passivates intrinsic defects film. In addition, Li also downshifts Fermi energy position Li-doped ETL 30 meV,...
Abstract Halide perovskite‐based photovoltaic (PV) devices have recently emerged for low energy consumption electronic such as Internet of Things (IoT). In this work, an effective strategy to form a hole‐selective layer using phenethylammonium iodide (PEAI) salt is presented that demonstrates unprecedently high open‐circuit voltage 0.9 V with 18 µW cm −2 under 200 lux (cool white light‐emitting diodes). An appropriate post‐deposited amount PEAI (2 mg) strongly interacts the perovskite...
The influence of illumination on the long‐term performance planar structured perovskite solar cells (PSCs) is investigated using fast and spatially resolved luminescence imaging. authors analyze effect illuminated current density–voltage ( J – V ) light‐soaking measurements pristine PSCs by providing visual evidence for spatial inhomogeneous evolution device performance. Regions that are exposed to light initially produce stronger electroluminescence signals than surrounding unilluminated...
Polymer solar cells are a promising technology for the commercialization of low cost, large scale organic cells. With evolution high efficiency (>13%) non-fullerene polymer cells, stability has become crucial parameter to be considered. Among several degradation mechanisms burn-in photo-degradation is relatively less studied. Herein, we present first systematic study novel PBDB-T:ITIC fullerene-free The thermally treated and as-prepared were exposed continuous 1 sun illumination 5 hours....
Abstract Greater stability of low-dimensional halide perovskites as opposed to their three-dimensional counterparts, alongside high extinction coefficient and thus excellent emission properties, have made them popular candidates for optoelectronic applications. Topological edges are found in two-dimensional that show distinct electronic properties. In this work, using Kelvin Probe Force Microscopy, performed on butylammonium lead bromide (BA 2 PbBr 4 ) single crystals with optical bandgap...
Small grain size and near-horizontal boundaries are known to be detrimental the carrier collection efficiency device performance of pure-sulfide Cu2 ZnSnS4 (CZTS) solar cells. However, forming large grains spanning absorber layer while maintaining high electronic quality is challenging particularly for pure sulfide CZTS. Herein, a liquid-phase-assisted growth (LGG) model that enables formation across CZTS without compromising demonstrated. By introducing Ge-alloyed nanoparticle at bottom...
The authors directly show that grain size and quality have a negligible impact on the excitonic characteristics of perovskite semiconductors.
Mixed-halide wide-band gap perovskites (WBPs) still suffer from losses due to imperfections within the absorber and segregation of halide ions under external stimuli. Herein, we design a multifunctional passivator (MFP) by mixing bromide salt, formamidinium (FABr) with p-type self-assembled monolayer (SAM) target nonradiative recombination pathways. Photoluminescence measurement shows considerable suppression rates after treatment FABr. However, WBPs remained susceptible for which addition...
In this study, we provide insights into planar structure methylammonium lead triiodide (MAPbI3) perovskite solar cells (PSCs) using electroluminescence and photoluminescence imaging techniques. We demonstrate the strength of these techniques in screening relatively large area PSCs, correlating cell electrical parameters to images visualizing features which contribute variation extracted from current density-voltage characterizations. It is further used investigate one major concerns about...
While interfacial and grain‐boundary passivation presently attract enormous research interest for perovskite solar cells (PSCs), the improvement of Cs‐(FAPbI 3 ) X (MAPbBr Y bulk quality still lacks systematical study, especially constructing polycrystalline layers in planar configurations. Here, a DMSO‐molecule‐process improving 0.85 0.15 is developed, where molar ratio precursors, kind anti‐solvents, speed‐time profiles are found critical. The optimized treatment significantly enhanced...
Elucidating the decay mechanisms of photoexcited charge carriers is key to improving efficiency solar cells based on organo-lead halide perovskites.
Abstract Sulfide kesterite Cu 2 ZnSnS 4 (CZTS) solar cells, containing earth‐abundant and environmentally benign constituents, are regarded as promising candidates for thin‐film photovoltaic technologies. CZTS device performance, however, is currently limited by severe nonradiative recombination caused abundant deep‐level defects. Herein, an effective defect engineering approach high bandgap cells using a newly introduced moisture‐assisted post‐deposition annealing treatment reported. This...
Abstract Reducing non‐radiative recombination and addressing band alignment mismatches at interfaces remain major challenges in achieving high‐performance wide‐bandgap perovskite solar cells. This study proposes the self‐organization of a thin two‐dimensional (2D) BA 2 PbBr 4 layer beneath three‐dimensional (3D) Cs 0.17 FA 0.83 Pb(I 0.6 Br 0.4 ) 3 , forming 2D/3D bilayer structure on tin oxide (SnO layer. process is driven by interactions between oxygen vacancies SnO surface hydrogen atoms...
Abstract In this essay, the authors use two properly encapsulated high‐efficiency mesoscopic perovskite solar cells (PSCs), which a state‐of‐the‐art composition (HC(NH 2 ) PbI 3 0.85 (CH NH PbBr 0.15 with excess as active layer, to demonstrate potential effect of dynamical electroluminescence responses on analysis and interpretation PSCs electrical characteristic. The essay does not aim determine how overcome issue, nor investigate its physical/chemical origin, although tentative...