A5084330026- Perovskite Materials and Applications
- Conducting polymers and applications
- Silicon and Solar Cell Technologies
- Chalcogenide Semiconductor Thin Films
- solar cell performance optimization
- Thin-Film Transistor Technologies
- Semiconductor materials and interfaces
- Photovoltaic System Optimization Techniques
- Quantum Dots Synthesis And Properties
- Solar Thermal and Photovoltaic Systems
- Organic Electronics and Photovoltaics
- Solid-state spectroscopy and crystallography
- Integrated Circuits and Semiconductor Failure Analysis
- Silicon Nanostructures and Photoluminescence
- CCD and CMOS Imaging Sensors
- Infrared Target Detection Methodologies
- Organic Light-Emitting Diodes Research
- Advancements in Solid Oxide Fuel Cells
- X-ray Diffraction in Crystallography
- Semiconductor materials and devices
- Machine Learning in Materials Science
- Stress and Burnout Research
- Calibration and Measurement Techniques
- Advanced Surface Polishing Techniques
- Force Microscopy Techniques and Applications
Australian National University
2015-2024
Canberra (United Kingdom)
2017-2020
ACT Government
2013
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...
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.
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...
Abstract The interdigitated back contact (IBC) solar cells developed at the Australian National University have resulted in an independently confirmed (Fraunhofer Institut für Solare Energiesysteme (ISE) CalLab) designated‐area efficiency of 24.4 ± 0.7%, featuring short‐circuit current density 41.95 mA/cm 2 , open‐circuit voltage 703 mV and 82.7% fill factor. cell, × cm area, was fabricated on a 230 µm thick 1.5 Ω n‐type Czochralski wafer, utilising plasma‐enhanced chemical vapour deposition...
Abstract The open‐circuit voltage ( V OC ) and fill factor are key performance parameters of solar cells, understanding the underlying mechanisms that limit these in real devices is critical to their optimization. Device modeling combined with luminescence cell current–voltage I – measurements show carrier transport limitations within can significantly reduce around maximum power point as well as, under certain conditions, at . An important consequence terminal cannot be assumed a priori...
Abstract The article commences with a review focusing on three critical aspects of the perovskite/Si tandem technology: evolution efficiencies to date, comparisons Si subcell choices, and interconnection design strategies. Building this review, clear route is provided for minimizing optical losses aided by simulations recently reported high‐efficiency system, optimizations which result in current densities ≈20 mAcm −2 front‐side texture. primary focus electrical modeling Si‐subcell, order...
We investigate the properties of an inexpensive hole-transporting material (HTM), copper phthalocyanine (CuPc), deposited by a solution-processing method in perovskite solar cells (PSCs). Cracks are found to be abundant on as-deposited CuPc films, which lead serious shunts and interface recombination. Surprisingly, recombination significantly reduced cell performance is greatly improved after heat treatment at 85 °C. find that enhancement due heat-induced migration Au particles away from...
Abstract Dimensional engineering of perovskite films is a promising pathway to improve the efficiency and stability solar cells (PSCs). In this context, surface or bulk passivation defects in 3D film by careful introduction 2D plays key role. Here authors demonstrate scheme based on octylammonium chloride, show that it provides both 1.6 eV bandgap for highly efficient (≈23.62%) PSCs with open‐circuit voltages up 1.24 V. Surface depth‐resolved microscopy spectroscopy analysis reveal Cl −...
The origin of hysteresis behavior is probed in perovskite solar cells (PSCs) with simultaneous measurements cell open circuit voltage ( V oc ) and photoluminescence intensity over time following illumination the cell. It shown, for first time, that transient changes terminal luminescent do not follow relationship would be predicted by generalized Plank radiation law. A mechanism proposed based on presence a resistive barrier to majority carrier flow at interface between film electron or hole...
It is highly probable that perovskite solar cells (PSCs) are mixed electronic-ionic conductors, with ion migration being the driving force for PSC hysteresis. However, there much not understood about interaction of other processes in cell. The key question is: what factors a influenced when ions free to move? In this contribution, we employ numerical drift-diffusion model PSCs show both anions and cations trap-mediated recombination bulk and/or at surfaces absorber can manifest...
Abstract Direct metallization of lightly doped n‐type crystalline silicon (c‐Si) is known to routinely produce non‐Ohmic (rectifying) contact behaviour. This has inhibited the development c‐Si solar cells with partial rear contacts, an increasingly popular cell design for high performance p‐type cells. In this contribution we demonstrate that low resistance Ohmic wafers can be achieved by incorporating a thin layer work function metal calcium (ϕ ~2.9 eV) between surface and overlying...
Abstract We demonstrate a procedure for quantifying efficiency gains that treats resistive, recombinative, and optical losses on an equal footing. For this, we apply our conductive boundary model as implemented in the Quokka cell simulator. The generation profile is calculated with novel analytical light‐trapping model. This parameterizes measured reflection spectra capable of turning experimental case gradually into ideal Lambertian scheme. Simulated short‐circuit current densities agree...
Abstract This review explores the current state of art in spatially resolved characterization mixed‐halide perovskite solar cells. As size cells and modules continues to grow, quantification spatial distribution key cell parameters will become increasingly valuable predicting ultimate cell‐level performance tracking process homogeneity. Here, both high resolution microscopic approaches using scanning techniques camera‐based methods for full‐area and/or module analysis are discussed. The...
Dimensional engineering of perovskite solar cells has attracted significant research attention recently because the potential to improve both device performance and stability. Here, a novel 2D passivation scheme for 3D is demonstrated using mixed cation composition based on two different isomers butylammonium iodide. The dual-cation outperforms its single counterparts in surface quality, resulting devices with an impressive open-circuit voltage 1.21 V optical bandgap ≈1.6 eV, champion...
This study demonstrates the transformative impact of incorporating poly(vinylidene fluoride-co-trifluoroethylene) P(VDF-TRFE) as an additive in hole transport layer (HTL) 2,2′,7,7′-Tetrakis[N,N-di(4-methoxyphenyl)amino]-9,9′-spirobifluorene (Spiro-OMeTAD). The forms resilient coordination bonds with 4-tert-butylpyridine (TBP) and lithium bis(trifluoromethanesulfonyl)imide additives, which mitigates TBP evaporation improves Spiro-OMeTAD film quality. In addition, we observed improvements...
The ability to extract material parameters of perovskite from quantitative experimental analysis is essential for rational design photovoltaic and optoelectronic applications. However, the difficulty this increases significantly with complexity theoretical model number perovskite. Here we use Bayesian optimization develop an platform that can up 8 fundamental organometallic semiconductor a transient photoluminescence experiment, based on complex full physics includes drift-diffusion carriers...
Over 29%-efficient monolithic perovskite/Si tandem solar cells based on a poly-Si/SiO 2 passivating contact cell.
A controlled amount of excess lead iodide (PbI2) in the perovskite precursor has been widely used solar cells (PSCs) to enhance device's performance by passivating defects. However,...
Abstract Perovskite solar cells (PSCs) have made rapid advances in efficiency when fabricated as small‐area devices. A key challenge is to increase the active area while retaining high performance, which requires fast and reliable measurement techniques spatially resolve cell properties. Luminescence imaging‐based are one attractive possibility. thermodynamic treatment of luminescence radiation from MAPbI 3 related perovskite semiconductors predicts that intensity emission proportional...
Commercial and R&D photoluminescence imaging systems commonly employ indirect bandgap silicon charge-coupled device (CCD) sensors. Silicon is a weak absorber of the near-infrared band-to-band emission silicon, significant lateral spreading luminescence signal can occur within sensor. Uncorrected, this effect reduces image contrast, introduces artificial gradients, limits minimum feature size for which accurate quantitative measurements be derived. Empirical quantification defined in terms...