ORCID Profile
0000-0002-7538-0680
Current Organisation
The University of Sydney Sydney University Press
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Materials engineering | Nanomaterials | Functional materials | Photonics optoelectronics and optical communications |
Publisher: Elsevier BV
Date: 12-2019
Publisher: Elsevier BV
Date: 02-2018
Publisher: Elsevier BV
Date: 10-2022
Publisher: IEEE
Date: 07-2016
Publisher: Wiley
Date: 31-01-2020
Publisher: Elsevier BV
Date: 03-2018
Publisher: Springer Science and Business Media LLC
Date: 25-07-2018
Publisher: Wiley
Date: 08-2020
Publisher: Royal Society of Chemistry (RSC)
Date: 2021
DOI: 10.1039/D1TA05699A
Abstract: Bromide-containing long alkylammonium chain organic cations effectly passivate defects on 1.72 eV perovskite film surfaces and greatly enhance both the performance and stability of perovskite solar cells.
Publisher: Wiley
Date: 17-11-2020
Abstract: Dimensional engineering of perovskite solar cells has attracted significant research attention recently because of the potential to improve both device performance and stability. Here, a novel 2D passivation scheme for 3D perovskite solar cells is demonstrated using a mixed cation composition of 2D perovskite based on two different isomers of butylammonium iodide. The dual‐cation 2D perovskite outperforms its single cation 2D counterparts in surface passivation quality, resulting in devices with an impressive open‐circuit voltage of 1.21 V for a perovskite composition with an optical bandgap of ≈1.6 eV, and a ch ion efficiency of 23.27%. Using a combination of surface elemental analysis and valence electron spectra decomposition, it is shown that an in situ interaction between the 2D perovskite precursor and the 3D active layer results in surface intermixing of 3D and 2D perovskite phases, providing an effective combination of defect passivation and enhanced charge transfer, despite the semi‐insulating nature of the 2D perovskite phase. The demonstration of the synergistic interaction of multiple organic spacer cations in a 2D passivation layer offers new opportunities for further enhancement of device performance with mixed dimensional perovskite solar cells.
Publisher: American Association for the Advancement of Science (AAAS)
Date: 22-01-2021
Abstract: In perovskite solar cells, the insulating nature of passivation layers needed to boost open-circuit voltage also increases the series resistance of the cell and limits the fill factor. Most improvements in power conversion efficiency have come from higher open-circuit voltage, with most fill factor improvements reported for very small-area cells. Peng et al. used a nanostructured titanium oxide electron transport layer to boost the fill factor of larger-area cells (1 square centimeter) to 0.84 by creating local regions with high conductivity. Science , this issue p. 390
Publisher: American Chemical Society (ACS)
Date: 08-10-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2020
DOI: 10.1039/C9SE01246J
Abstract: We demonstrate how perovskite hysteresis can result in permanent reductions in power output in perovskite/silicon tandem modules—including irreversible hotspot-induced damage—from only brief periods of shading.
Publisher: Informa UK Limited
Date: 03-04-2021
Publisher: Elsevier BV
Date: 02-2019
Publisher: American Chemical Society (ACS)
Date: 16-11-2023
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7NR06812C
Abstract: Adsorbed carbon nanomaterial based dual electron transport layer ensures more efficient and stable perovskite solar cells.
Publisher: MDPI AG
Date: 25-10-2016
DOI: 10.3390/EN9110861
Publisher: Elsevier BV
Date: 11-2018
Publisher: Springer Science and Business Media LLC
Date: 2017
Publisher: Elsevier BV
Date: 04-2018
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 11-2018
Publisher: Elsevier BV
Date: 11-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CP04053A
Abstract: In this work, we have demonstrated the incorporation of metal (Ag NPs) and dielectric nanoparticles (SiO 2 NPs) into the hole transporting layers of inverted PSCs using facile deposition methods.
Publisher: Wiley
Date: 11-12-2020
Abstract: Instability in perovskite solar cells is the main challenge for the commercialization of this solar technology. Here, a contactless, nondestructive approach is reported to study degradation across perovskite and perovskite/silicon tandem solar cells. The technique employs spectrally and spatially resolved absorptivity at sub‐bandgap wavelengths of perovskite materials, extracted from their luminescence spectra. Parasitic absorption in other layers, carrier diffusion, and photon smearing phenomena are all demonstrated to have negligible effects on the extracted absorptivity. The absorptivity is demonstrated to reflect real degradation in the perovskite film and is much more robust and sensitive than its luminescence spectral peak position, representing its optical bandgap, and intensity. The technique is applied to study various common factors which induce and accelerate degradation in perovskite solar cells including air and heat exposure and light soaking. Finally, the technique is employed to extract the in idual absorptivity component from the perovskite layer in a monolithic perovskite/silicon tandem structure. The results demonstrate the value of this approach for monitoring degradation mechanisms in perovskite and perovskite/silicon tandem cells at early stages of degradation and various fabrication stages.
Publisher: Wiley
Date: 31-03-2021
Abstract: Perovskite solar cells are a potential game changer for the photovoltaics industry, courtesy of their facile fabrication and high efficiency. Despite this, commercialization is being held back by poor stability. To become economically feasible for commercial production, perovskite solar cells must meet or exceed industry standards for operational lifetime and reliability. In this regard, mixed dimensional 2D‐3D perovskite solar cells, incorporating long carbon‐chain organic spacer cations, have shown promising results, with enhancement in both device efficiency and stability. Dimensional engineering of perovskite films requires a delicate balance of 2D and 3D perovskite composition to take advantage of the specific properties of each material phase. This review summarizes and assesses the current understanding, and apparent contradictions in the state‐of‐the‐art mixed dimensional perovskite solar cell literature regarding the origin of stability and performance enhancement. By combining and comparing results from experimental and theoretical studies it is focused on how the perovskite composition, film formation methods, additive and solvent engineering influence efficiency and stability, and identify future research directions to further improve both key performance metrics.
Publisher: Elsevier BV
Date: 2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA23288D
Abstract: Sub-bandgap defect characterization in PTB7 by photothermal deflection spectroscopy (PDS).
Publisher: SAGE Publications
Date: 13-10-2023
DOI: 10.1177/26349825221125496
Abstract: In the face of climate change, Western environmental research and governance processes and institutions are increasingly seeking to learn from and harness Indigenous peoples knowledges, perspectives, and practices of land and water management. There are both opportunities and risks for Indigenous groups seeking to exploit these opportunities to (re)connect with their homelands and reinvigorate dormant cultural practices. This article considers these issues by highlighting the barriers, risks, and opportunities, across three case environmental study sites – cultural burning, Geographic Information Systems (GIS) mapping, and marine science. We offer Indigenous data sovereignty and Indigenous data governance as both guiding principles and a practical blueprint that can make safe these intercultural environmental collaborations by mitigating against perverse or unintended consequences of Indigenous knowledge theft, as well as maximising opportunities to foster sustainable self-determination and self-governance.
Publisher: American Chemical Society (ACS)
Date: 26-09-2018
Publisher: Elsevier BV
Date: 12-2018
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7NR06151J
Abstract: Sub-bandgap defect characterization of PBDB-T:ITIC after photo-degradation by photo-thermal deflection spectroscopy (PDS).
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 02-2017
Publisher: IEEE
Date: 06-2016
Publisher: Wiley
Date: 18-12-2020
Publisher: Wiley
Date: 02-08-2022
Abstract: High bandgap perovskite solar cells are integral to perovskite‐based multi‐junction tandem solar cells with efficiency potentials over 40%. However, at present, high bandgap perovskite devices underperform compared to their mid bandgap counterparts in terms of voltage outputs and fill factors resulting in lower than ideal efficiencies. Here, the low fill factor aspect of high bandgap perovskite is addressed by developing a cation‐diffusion‐based double‐sided interface passivation scheme that simultaneously provides bulk passivation for a 1.75 eV perovskite cell that is also compatible with a p‐i‐n cell architecture. The ch ion cell achieves a record fill factor of 86.5% and a power conversion efficiency of 20.2%. Results of ionic distribution profiling, Fourier transform infrared spectroscopy, and X‐ray diffraction crystallography reveal evidence of cation diffusion from the surface perovskite passivation layer into bulk. The diffused cations reduce Shockley–Read–Hall recombination in the perovskite bulk and at the surfaces with the latter being more dominant as confirmed by light‐intensity dependent and temperature‐dependent open‐circuit voltage measurements as well as thermal admittance spectroscopy. This concurrent bulk and surface passivation scheme renders record fill factor and efficiency in the double‐side passivated cells. This provides new insights for future passivation strategies based on ionic diffusion of functionalized materials.
Publisher: Wiley
Date: 06-06-2021
Abstract: Early prediction of spatially resolved performance of perovskite solar cells (PSCs) is essential for process monitoring, control and fault diagnosis, and upscaling of this emerging technology. Herein, a fast, nonde structive, contactless imaging‐based approach is developed to visualize the spatial distribution of possible light current density−voltage (pseudo‐ J−V ) curves on finished and partly finished cells. This allows for the extraction of other critical spatially resolved properties including implied open‐circuit voltage and pseudo‐fill factor. The technique is applied to systematically investigate various degradation behaviors on PSCs including thermal stability, light soaking, and ambient air exposure. Finally, it is used to predict pseudo‐ J−V curves of various perovskite films with different compositions. These results demonstrate the significant value of this fast imaging technique for the research and development of PSCs ranging from material selection, process optimization, to degradation study.
Publisher: Springer Science and Business Media LLC
Date: 25-05-2018
Publisher: Wiley
Date: 22-05-2023
Abstract: The drastic reduction in launch and manufacturing costs of space hardware has facilitated the emergence of "commercial" space. Radiation‐hard organometal halide perovskite solar cells (PSCs) with low‐cost and high‐efficiency potentials are promising for space applications.High‐efficiency PSCs are tested with different hole transport materials (HTMs) and dopants on 175µm sapphire substrates under 7MeV‐proton‐irradiation‐tests at accumulated fluences of 10 11 , 10 12 , and 10 13 protons cm −2 . While all cells retain % of their initial power conversion efficiencies (PCEs) after 10 11 protons cm −2 irradiation, PSCs that have tris(pentafluorophenyl)borane (TPFB) as the HTM dopant and poly[bis(4‐phenyl)(2,5,6‐trimethylphenyl) amine (PTAA) or PTAA:C8BTBT (C8BTBT = 2,7‐Dioctyl[1]benzothieno[3,2‐b][1]benzothiophene) as the HTM are more tolerant to higher‐fluence radiation than their counterparts with the lithium bis(trifluoromethanesulfonyl)imide (LiTFSI) dopant and the 2,2′,7,7′‐Tetrakis[N,N‐di(4‐methoxyphenyl)amino]‐9,9′‐spirobifluorene (Spiro‐OMeTAD) HTM. Radiation induces fluorine diffusion from the LiTFSI dopant toward the perovskite absorber (confirmed by depth‐resolved X‐ray photoelectron spectroscopy) introducing defects. Radiation‐induced defects in cells with the TPFB dopant instead are different and can be “annealed out” by thermal vacuum resulting in PCE recovery. This is the first report using thermal admittance spectroscopy and deep‐level transient spectroscopy for defect analyses on proton‐irradiated and thermal‐vacuum‐recovered PSCs. The insights generated are expected to contribute to efforts in developing low‐cost light‐weight solar cells for space applications.
Publisher: Wiley
Date: 11-08-2021
Abstract: Dimensional engineering of perovskite films is a promising pathway to improve the efficiency and stability of perovskite solar cells (PSCs). In this context, surface or bulk passivation of defects in 3D perovskite film by careful introduction of 2D perovskite plays a key role. Here the authors demonstrate a 2D perovskite passivation scheme based on octylammonium chloride, and show that it provides both bulk and surface passivation of 1.6 eV bandgap 3D perovskite film for highly efficient (≈23.62%) PSCs with open‐circuit voltages up to 1.24 V. Surface and depth‐resolved microscopy and spectroscopy analysis reveal that the Cl − anion diffuses into the perovskite bulk, passivating defects, while the octylammonium ligands provide effective, localized surface passivation. The authors find that the Cl − diffusion into the perovskite lattice is independent of the 2D perovskite crystallization process and occurs rapidly during deposition of the 2D precursor solution. The annealing‐induced evaporation of Cl from bulk perovskite is also inhibited in 2D–3D perovskite film as compared to pristine 3D perovskite, ensuring effective bulk passivation in the relevant film.
Publisher: AIP Publishing
Date: 15-10-2021
DOI: 10.1063/5.0061483
Abstract: Organic–inorganic metal halide perovskite solar cells represent the fastest advancing solar cell technology in terms of energy conversion efficiency improvement, as seen in the last decade. This has become a promising technology for next-generation, low-cost, high-efficiency photovoltaics including multi-junction tandem cell concepts. Double-junction tandem cells have much higher efficiency limits of 45%, beyond the Shockley–Queisser limits for a single-junction solar cell. In this review, recent progress with the perovskite tandem solar cells is highlighted, in particular, with 2-terminal perovskite–Si, perovskite–CIGS [where CIGS = Cu(In,Ga)(S,Se)2], perovskite–organic photovoltaic, perovskite–perovskite, and 3-junction-perovskite tandems. The opportunity and challenges of two-terminal monolithic perovskite tandems are discussed including a roadmap of strategies for further improving their efficiencies.
Publisher: Elsevier BV
Date: 05-2018
Publisher: Elsevier BV
Date: 12-2018
Publisher: IEEE
Date: 06-2016
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C6RA14186B
Abstract: Low temperature (140 °C) processed MA 0.6 FA 0.4 PbI 3 /AZO devices exhibit 20% higher PCE and two-fold higher device stability compared to MA 0.6 FA 0.4 PbI 3 /ZnO devices.
Publisher: Elsevier BV
Date: 11-2017
Publisher: IEEE
Date: 06-2017
Publisher: Elsevier BV
Date: 08-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7CP03551A
Abstract: A F4TCNQ doped FDT HTL based PSC demonstrates 75% higher device stability than a conventional Li-TFSI doped FDT based PSC.
Publisher: IEEE
Date: 06-2017
Publisher: Elsevier BV
Date: 09-2017
Publisher: Elsevier BV
Date: 08-2017
Publisher: American Chemical Society (ACS)
Date: 16-08-2022
Publisher: American Chemical Society (ACS)
Date: 06-09-2017
Publisher: Wiley
Date: 18-11-2022
Abstract: A novel, camera‐based method for direct implied open‐circuit voltage (i V OC ) imaging via the use of a single bandpass filter (s‐BPF) is developed for large‐area photovoltaic solar cells and precursors. The photoluminescence (PL) emission is imaged using a narrow BPF with centre energy inside the high‐energy tail of the PL emission, utilising the close‐to‐unity and nearly constant absorptivity of typical photovoltaic devices in this energy range. As a result, the exact value of the s le's absorptivity within the BPF transmission band is not required. The use of an s‐BPF enables a fully contactless approach to calibrate the absolute PL photon flux for spectrally integrated detectors, including cameras. The method eliminates the need for knowledge of the imaging system spectral response. Through an appropriate choice of the BPF centre energy, a range of absorber compositions or a single absorber with different surface morphologies, such as planar and textured, can be imaged, all without the need for additional detection optics. The feasibility of this s‐BPF method is first validated. The relative error in i V OC is determined to be ≤1.5%. The method is then demonstrated on device stacks with two different perovskite compositions commonly used in single‐junction and monolithic tandem solar cells.
Publisher: American Chemical Society (ACS)
Date: 25-09-2017
Abstract: 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 MA
Publisher: IEEE
Date: 06-2017
Publisher: Institute of Electrical and Electronics Engineers (IEEE)
Date: 07-2019
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D2NR06496K
Abstract: Metal halide perovskite materials demonstrate immense potential for photovoltaic and electronic applications.
Publisher: Elsevier BV
Date: 03-2018
Publisher: Informa UK Limited
Date: 02-01-2022
Publisher: Elsevier BV
Date: 12-2016
Publisher: Wiley
Date: 26-05-2022
Abstract: One of the important factors in the performance of perovskite solar cells (PSCs) is effective defect passivation. Dimensional engineering technique is a promising method to efficiently passivate non‐radiative recombination pathways in the bulk and surface of PSCs. Herein, a passivation approach for the perovskite/hole transport layer interface is presented, using a mixture of guanidinium and n‐octylammonium cations introduced via GuaBr and n‐OABr. The dual‐cation passivation layer can provide an open‐circuit voltage of 1.21 V with a power conversion efficiency of 23.13%, which is superior to their single cation counterparts. The mixed‐cation passivation layer forms a 1D/2D perovskite film on top of 3D perovskite, leading to a more hydrophobic and smoother surface than the uncoated film. A smooth surface can diminish non‐radiative recombination and enhance charge extraction at the interface making a better contact with the transport layer, resulting in improved short‐circuit current. In addition, space charge‐limited current measurements show a three times reduction in the trap‐filled limit voltage in the mixed‐cation passivated s le compared with unpassivated cells, indicating fewer trapped states. The shelf‐life stability test in ambient atmosphere with 60% relative humidity as well as light‐soaking stability reveal the highest stability for the dual‐cation surface passivation.
Publisher: Cambridge University Press (CUP)
Date: 11-10-2017
DOI: 10.1017/S1744137417000479
Abstract: This paper analyses the origin of innovation using institutional economic theory. Because of distributed information and fundamental uncertainty, an efficient institutional context for the economic organization of innovation in its early stages is often that of a common pool resource. The theory of the innovation commons draws upon Hayek, Williamson and Ostrom to present the innovation problem as a combined knowledge problem, implicit contracting problem and collective action governance problem. Innovation commons theory also implies that Kirzner's model of entrepreneurial opportunity discovery extends to higher-order groups, suggesting a multilevel selection model of economic evolution.
Publisher: Elsevier BV
Date: 08-2017
Publisher: Wiley
Date: 30-10-2020
Location: Bangladesh
Start Date: 05-2023
End Date: 05-2024
Amount: $500,000.00
Funder: Australian Research Council
View Funded Activity