ORCID Profile
0000-0002-9629-8213
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In Research Link Australia (RLA), "Research Topics" refer to ANZSRC FOR and SEO codes. These topics are either sourced from ANZSRC FOR and SEO codes listed in researchers' related grants or generated by a large language model (LLM) based on their publications.
Functional Materials | Optical Properties of Materials | Organic Chemistry | Condensed Matter Physics | Macromolecular and Materials Chemistry | Organic Chemical Synthesis | Materials Engineering | Nanochemistry and Supramolecular Chemistry | Structural Chemistry and Spectroscopy | Electronic and Magnetic Properties of Condensed Matter; Superconductivity | Degenerate Quantum Gases and Atom Optics | Nanoelectronics
Expanding Knowledge in the Chemical Sciences | Expanding Knowledge in the Physical Sciences | Commercial Energy Conservation and Efficiency | Solar-Photovoltaic Energy | Management of Greenhouse Gas Emissions from Information and Communication Services | National Security |
Publisher: American Chemical Society (ACS)
Date: 06-08-2020
Publisher: American Chemical Society (ACS)
Date: 03-04-2018
Publisher: American Chemical Society (ACS)
Date: 25-01-2019
Publisher: American Chemical Society (ACS)
Date: 02-07-2014
DOI: 10.1021/JP504564S
Abstract: Synthetic peptides offer enormous potential to encode the assembly of molecular electronic components, provided that the complex range of interactions is distilled into simple design rules. Here, we report a spectroscopic investigation of aggregation in an extensive series of peptide-perylene diiimide conjugates designed to interrogate the effect of structural variations. By fitting different contributions to temperature dependent optical absorption spectra, we quantify both the thermodynamics and the nature of aggregation for peptides by incrementally varying hydrophobicity, charge density, length, as well as asymmetric substitution with a hexyl chain, and stereocenter inversion. We find that coarse effects like hydrophobicity and hexyl substitution have the greatest impact on aggregation thermodynamics, which are separated into enthalpic and entropic contributions. Moreover, significant peptide packing effects are resolved via stereocenter inversion studies, particularly when examining the nature of aggregates formed and the coupling between π electronic orbitals. Our results develop a quantitative framework for establishing structure-function relationships that will underpin the design of self-assembling peptide electronic materials.
Publisher: Royal Society of Chemistry (RSC)
Date: 2018
DOI: 10.1039/C7CP08452H
Abstract: Photoluminescence quantum yield enhancement based on energy transfer in surface-anchored metal–organic frameworks.
Publisher: Springer International Publishing
Date: 09-09-2016
Publisher: SPIE
Date: 05-10-2016
DOI: 10.1117/12.2236586
Publisher: American Chemical Society (ACS)
Date: 07-06-2011
DOI: 10.1021/CG200660Y
Publisher: Elsevier BV
Date: 09-2017
Publisher: Royal Society of Chemistry (RSC)
Date: 2015
DOI: 10.1039/C5EE01713K
Abstract: Transient absorption spectroscopy reveals that the superior performance of three- versus two-phase polymer : fullerene blends is associated with hole migration from intermixed to pure polymer phases.
Publisher: Inderscience Publishers
Date: 2017
Publisher: American Chemical Society (ACS)
Date: 18-10-2016
Abstract: Here, a comprehensive study of the influence of polymer:fullerene mixing behavior on the performance, thin-film microstructure, photophysics, and device physics of polymer solar cells is presented. In particular, blends of the donor polymer PBDTTT-EFT with the acceptor PC
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7EE01387F
Abstract: Control of domain purity in polymer/fullerene solar cells is realised through controlling the time that an anti-solvent treatment is applied.
Publisher: American Chemical Society (ACS)
Date: 15-04-2015
DOI: 10.1021/CM504655F
Publisher: American Chemical Society (ACS)
Date: 05-05-2014
DOI: 10.1021/JZ5006362
Abstract: Ultrafast photoluminescence (PL) spectroscopy can cleanly resolve excited-state dynamics and coupling to the environment, however, there is a demand for new methods that combine broadband detection and low backgrounds. We present a new method, transient grating photoluminescence spectroscopy (TGPLS), that addresses this challenge by exploiting a focusing geometry where ultrafast broadband spectra are transiently diffracted away from the background PL. We show that TGPLS can resolve the complex spectral relaxation observed in conjugated polymer and oligomer solutions, with an essentially flat spectral response throughout the visible region and potentially beyond. The benefits we demonstrate using TGPLS could expand access to spectral information, particularly for other multichromophoric and heterogeneous materials where complex spectral relaxation is expected.
Publisher: Royal Society of Chemistry (RSC)
Date: 2013
DOI: 10.1039/C2CC37447A
Abstract: We investigate the interaction between conjugated polyelectrolytes and surfactants in solution and solid phases. We identify multiple modes of interaction and propose a model that accounts for their interplay and pronounced variation in photophysics over a wide range of conditions.
Publisher: American Chemical Society (ACS)
Date: 25-10-2008
DOI: 10.1021/NL802425R
Abstract: Understanding and controlling nanoscale morphology is crucial to the performance of polymer bulk heterojunction solar cells, as well as other optoelectronic devices such as polymer light-emitting diodes, field-effect transistors, and sensors. In photovoltaic devices, optimum blend morphologies must be commensurate with the nanometer length scales of exciton diffusion and charge separation. We report on a generally applicable method of optimizing the phase segregation in polymer-polymer bulk heterojunctions based on tuning mixtures of low and high boiling point solvents. We have characterized the resulting blend morphologies with nanometer resolution using a transient absorption technique that probes the distribution of paths traveled by the excitons themselves prior to generating charges at an interface. Photovoltaic efficiencies are accounted for in terms of exciton diffusion, geminate pair separation, and polymer ordering, all of which are sensitive to the nanoscale morphology determined by the composition of the solvent mixture.
Publisher: Wiley
Date: 03-2018
Publisher: American Chemical Society (ACS)
Date: 14-04-2015
DOI: 10.1021/ACS.JPCLETT.5B00589
Abstract: A new synthetic method was developed to produce a range of transition-metal (Mn, Ni, and Cu) doped silicon nanocrystals (Si NCs). The synthesis produces monodisperse undoped and doped Si NCs with comparable average sizes as shown by transmission electron microscopy (TEM). Dopant composition was confirmed by EDX (energy dispersive X-ray spectroscopy). The optical properties of undoped and doped were compared and contrasted using absorption (steady-state and transient) and photoluminescence spectroscopy. Doped Si NCs demonstrated unique dopant-dependent optical properties compared to undoped Si NCs such as enhanced subgap absorption, and 40 nm shifts in the emission. Transient absorption (TA) measurements showed that photoexcitations in doped Si NCs relaxed via dopant states not present in undoped Si NCs.
Publisher: Springer Science and Business Media LLC
Date: 20-05-2022
DOI: 10.1038/S41467-022-30127-8
Abstract: Organic photovoltaics (OPVs) promise cheap and flexible solar energy. Whereas light generates free charges in silicon photovoltaics, excitons are normally formed in organic semiconductors due to their low dielectric constants, and require molecular heterojunctions to split into charges. Recent record efficiency OPVs utilise the small molecule, Y6, and its analogues, which – unlike previous organic semiconductors – have low band-gaps and high dielectric constants. We show that, in Y6 films, these factors lead to intrinsic free charge generation without a heterojunction. Intensity-dependent spectroscopy reveals that 60–90% of excitons form free charges at AM1.5 light intensity. Bimolecular recombination, and hole traps constrain single component Y6 photovoltaics to low efficiencies, but recombination is reduced by small quantities of donor. Quantum-chemical calculations reveal strong coupling between exciton and CT states, and an intermolecular polarisation pattern that drives exciton dissociation. Our results challenge how current OPVs operate, and renew the possibility of efficient single-component OPVs.
Publisher: American Chemical Society (ACS)
Date: 12-01-2017
Publisher: SPIE
Date: 26-09-2016
DOI: 10.1117/12.2238234
Publisher: Royal Society of Chemistry (RSC)
Date: 2016
DOI: 10.1039/C5CP06953J
Abstract: Multichromophore perylene arrays were designed and synthesized to have extremely efficient resonance energy transfer, as confirmed by ultrafast spectroscopy.
Publisher: Wiley
Date: 17-01-2017
Publisher: American Chemical Society (ACS)
Date: 18-12-2023
Abstract: Here, we systematically study the effect of fluorination on the performance of all-polymer solar cells by employing a naphthalene diimide (NDI)-based polymer acceptor with thiophene-flanked phenyl co-monomer. Fluorination of the phenyl co-monomer with either two or four fluorine units is used to create a series of acceptor polymers with either no fluorination (PNDITPhT), bifluorination (PNDITF2T), or tetrafluorination (PNDITF4T). In blends with the donor polymer PTB7-Th, fluorination results in an increase in power conversion efficiency from 3.1 to 4.6% despite a decrease in open-circuit voltage from 0.86 V (unfluorinated) to 0.78 V (tetrafluorinated). Countering this decrease in open-circuit voltage is an increase in short-circuit current from 7.7 to 11.7 mA/cm
Publisher: American Chemical Society (ACS)
Date: 24-11-2021
Publisher: Royal Society of Chemistry (RSC)
Date: 2023
DOI: 10.1039/D3CP02130K
Abstract: We present four novel perylene-acene dyads that undergo solvent tuneable emission, based on the presence of a charge transfer state. These dyes were shown to reach photoluminescence quantum efficiencies (PLQEs) as high as 45%.
Publisher: Royal Society of Chemistry (RSC)
Date: 2012
DOI: 10.1039/C2CC31465G
Abstract: Controlled aggregation of perylene bisimides in multiple modes has been achieved via symmetric substitution with peptides. Using optical probes of aggregation, the balance of hydrophobic and electrostatic forces are found to play a key role in directing self assembly and are exploited via solvent, pH, and specific extrinsic ion effects.
Publisher: Informa UK Limited
Date: 26-11-2015
Publisher: Wiley
Date: 04-08-2015
Publisher: Royal Society of Chemistry (RSC)
Date: 2017
DOI: 10.1039/C7TA02749D
Abstract: This work introduces six novel naphthalene diimide (NDI) molecular acceptors for evaluation in organic solar cells based on two different chemical architectures: a star-shaped structure with a triarylamine core flanked by three NDI moieties and a linear molecule composed of a bithiophene bridge between two NDI moieties.
Publisher: American Chemical Society (ACS)
Date: 11-08-2016
DOI: 10.1021/ACS.JPCLETT.6B01185
Abstract: The nonmirror image relationship between absorption and fluorescence spectra of conjugated polymers contrasts with most organic chromophores and is widely considered a signature of interchromopohore energy funneling. We apply broad-band ultrafast fluorescence spectroscopy to resolve the evolution of fluorescence spectra for dilute solutions of conjugated oligothiophenes, where no energy transfer is possible. Fluorescence spectra evolve from a mirror image of absorption, which lacks vibronic structure, toward a spectrally narrower and vibronically structured species on the hundreds of femtosecond to early picosecond time scale. Our analysis of this fluorescence spectral evolution shows that a broad distribution of torsional conformers is driven to rapidly planarize in the excited state, including in solid films, which is supported by Raman spectroscopy and quantum chemical modeling. Our data have important implications for understanding different energy-transfer regimes that are delineated by structural relaxation.
Publisher: Wiley
Date: 10-11-2016
Abstract: Five polymer donors with distinct chemical structures and different electronic properties are surveyed in a planar and narrow-bandgap fused-ring electron acceptor (IDIC)-based organic solar cells, which exhibit power conversion efficiencies of up to 11%.
Publisher: Royal Society of Chemistry (RSC)
Date: 2022
DOI: 10.1039/D1TC04800G
Abstract: Photocurrent generation dynamics are compared between three classes of organic acceptors using ultrafast spectroscopy. New excitations are important in non-fullerene acceptors, but their performance is impaired by charge recombination and disorder.
No related organisations have been discovered for Justin Hodgkiss.
Start Date: 2017
End Date: 05-2022
Amount: $668,500.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2017
End Date: 06-2024
Amount: $33,400,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 09-2013
End Date: 10-2016
Amount: $306,000.00
Funder: Australian Research Council
View Funded ActivityStart Date: 06-2017
End Date: 06-2020
Amount: $330,378.00
Funder: Australian Research Council
View Funded Activity