https://ogma.newcastle.edu.au/vital/access/ /manager/Index ${session.getAttribute("locale")} 5 https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:42999 Thu 25 May 2023 09:29:31 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:12495 Sat 24 Mar 2018 08:17:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19928 Sat 24 Mar 2018 08:03:47 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19913 w=5–72 kg mol⁻¹). Transmission electron microscopy (TEM) and scanning electron microscopy (SEM) have been used to support the STXM data. We find that unannealed P3HT:PCBM nanoparticles (NPs) exhibit a common core–shell morphology, with a PCBM-rich core and P3HT-rich shell. The morphology of the thermally annealed NP films is highly dependent upon the molecular weight of the P3HT and is determined by PCBM diffusion through the P3HT matrix. Two PCBM diffusion mechanisms operate within this system: (1) at high molecular weights diffusion of molecular PCBM dominates whilst, (2) at low molecular weights diffusion of the PCBM cores is significant. The Stokes–Einstein continuum model for diffusion has been used to determine a threshold molecular weight at which the diffusion of PCBM cores is activated in these films. The calculated value (M_w~38–25 kg mol⁻¹) is shown to agree very well with experimental observations. Finally, a model for the morphological evolution of annealed P3HT:PCBM NP films is developed.]]> Sat 24 Mar 2018 08:03:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21514 −6/°C; specific heat capacity: 0.95 kJ·(kg K)⁻¹; thermal conductivity coefficient: 0.58×10⁻² cm² s⁻¹; and thermal conductivity: 1.17 W·(m K)⁻¹. The examination of the phase composition indicates that cordierite, mullite, sillimanite, cristobalite and α-quartz are the main phase elements. Analysis of the microstructure shows that the cordierite crystals were formed during the sintering process and were dispersed evenly in the mullite crystals, which gave the samples a favourable thermal shock resistance. It was concluded that the ceramic material, a combination of cordierite and andalusite, is an excellent candidate for solar thermal storage material due to its high thermal shock resistance, temperature resistance and strength.]]> Sat 24 Mar 2018 08:03:37 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:20429 Sat 24 Mar 2018 08:03:23 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19663 Sat 24 Mar 2018 08:01:11 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21317 Sat 24 Mar 2018 07:52:52 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18349 Sat 24 Mar 2018 07:52:40 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:19398 b)pyrazine) (pC₆TP) and [6,6]-phenyl-C₆₁-butyric acid methylester (PCBM) have been prepared and studied as near infra-red (NIR) organic photonic devices. Photocurrent contributions from both components are observed and show a photoresponse down to approximately 1 eV. The performance of the devices as a function of annealing time is investigated. A model for the effect of structure on the NIR response of these devices is developed and highlights the ambipolar nature of pC₆TP as a charge transport material.]]> Sat 24 Mar 2018 07:52:04 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27081 Sat 24 Mar 2018 07:40:43 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:27964 Sat 24 Mar 2018 07:38:45 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29355 Sat 24 Mar 2018 07:34:16 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:26612 Sat 24 Mar 2018 07:34:00 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:29999 3/P3HT:ICBA/Ca/Al devices using the three main ISOS standard testing protocols: (a) ISOS-D-1, (b) ISOS-O-1 and (c) ISOS-L-1. We show that: (1) ITO/MoO₃/P3HT:ICBA/Ca/Al devices are more stable than their PEDOT counterparts under the ISOS-D-1 protocol, as has been reported previously. (2) Under the ISOS-O-1 protocol, unencapsulated MoO₃ based devices are more stable than the equivalent PEDOT device but, when encapsulated, the degradation rates of the MoO₃ and PEDOT devices are the same. (3) By contrast, when measured under the ISOS-L protocol, the MoO₃ based devices are either equivalent to (unencapsulated devices) or, indeed, actually degrade faster (encapsulated devices) that their PEDOT counterparts. We demonstrate that these differences arise from the dominant degradation mode changing under the different protocols. As such, this paper highlights that the choice of testing protocol significantly influences the reported stability of OPV devices. In particular, the ISOS-D and ISOS-L protocols do not necessary reflect OPV device performance under actual operating conditions and thus stability measurements using these protocols should be treated with caution.]]> Sat 24 Mar 2018 07:28:53 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23616 Sat 24 Mar 2018 07:13:27 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:23598 Sat 24 Mar 2018 07:12:22 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:41684 Mon 29 Jan 2024 17:43:13 AEDT ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:18633 Mon 20 Jul 2015 16:45:21 AEST ]]> https://ogma.newcastle.edu.au/vital/access/ /manager/Repository/uon:21024 w), was used to prepare P3HT: phenyl C61 butyric acid methyl ester (PCBM) nanoparticulate organic photovoltaic (NP OPV) devices and the effect of this variation on device performance is reported. Power conversion efficiency (PCE) is observed to peak for the mid-range of molecular weights tested, this behaviour varies from the trend generally observed with bulk heterojunction (BHJ) devices, where high molecular weight polymers deliver the highest PCEs. Here we demonstrate that polymer molecular weight affects the electronic, morphological and compositional structure of the nanoparticulate film. Significantly, it is the domain composition that is most highly correlated with device performance and this composition is driven by the PCBM mobility and aggregation within the nanoparticulate structure.]]> Fri 02 Sep 2022 11:14:24 AEST ]]>