2022 |
Thu-Trang D, Takeda Y, Sekine T, Yadav Y, Manzhos S, Feron K, et al., 'Bottom gate top contact organic transistors using thiophene and furan flanked diketopyrrolopyrrole polymers and its comparative study', FLEXIBLE AND PRINTED ELECTRONICS, 7 (2022) [C1]
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Nova |
2022 |
Ali AY, Holmes NP, Ameri M, Feron K, Thameel MN, Barr MG, et al., 'Low-Temperature CVD-Grown Graphene Thin Films as Transparent Electrode for Organic Photovoltaics', COATINGS, 12 (2022) [C1]
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Nova |
2021 |
Liu Q, Wang Y, Kohara A, Matsumoto H, Manzhos S, Feron K, et al., 'Correction: Tuning the Charge Carrier Polarity of Organic Transistors by Varying the Electron Affinity of the Flanked Units in Diketopyrrolopyrrole-Based Copolymers (Advanced Functional Materials, (2020), 30, 7, (1907452), 10.1002/adfm.201907452)', Advanced Functional Materials, 31 (2021)
In the originally published version of the article, the coordinates of Figure¿5(a)¿(c) were incorrect. The corrected figure is provided below. 5 Figure (Figure presented.) 2D-GIWA... [more]
In the originally published version of the article, the coordinates of Figure¿5(a)¿(c) were incorrect. The corrected figure is provided below. 5 Figure (Figure presented.) 2D-GIWAXS patterns of the thin films of a) pDPF-DTF2; b) pDPSe-DTF2; and c) pDPPy-DTF2 and their corresponding 1-D profiles of d,g) pDPF-DTF2; e,h) pDPSe-DTF2; f,i) pDPPy-DTF2 after the treatment under optimized annealing conditions. The authors apologize for any inconvenience this error may have caused.
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2021 |
Crovador R, Heim H, Cottam S, Feron K, Bhatia V, Louie F, et al., 'Advanced Control of Drug Delivery for in Vivo Health Applications via Highly Biocompatible Self-Assembled Organic Nanoparticles', ACS Applied Bio Materials, 4 6338-6350 (2021) [C1]
The use of nanostructured materials for targeted and controlled delivery of bioactive molecules is an attractive alternative to conventional drug administration protocols, enablin... [more]
The use of nanostructured materials for targeted and controlled delivery of bioactive molecules is an attractive alternative to conventional drug administration protocols, enabling selective targeting of diseased cells, lower administered dosages, and reduced systemic side effects. Although a variety of nanocarriers have been investigated in recent years, electroactive organic polymer nanoparticles present several exciting advantages. Here we demonstrate that thin films created from nanoparticles synthesized from violanthrone-79, an n-type semiconducting organic material, can incorporate and release dexamethasone in vitro in a highly controlled manner. By systematically altering the nanoparticle formation chemistry, we successfully tailored the size of the nanoparticles between 30 and 145 nm to control the initial amount of drug loaded into the organic particles. The biocompatibility of the different particles was tested using live/dead assays of dorsal root ganglion neurons isolated and cultured from mice, revealing that elevated levels of the sodium dodecyl sulfate surfactant used to create the smaller nanoparticles are cytotoxic; however, cell survival rates in nanoparticles larger than 45 nm exceed 86% and promote neurite growth and elongation. By manipulating the electrical stimulus applied to the electroactive nanoparticle films, we show an accelerated rate of drug release in comparison to passive release in aqueous media. Furthermore, pulsing the electrical stimulus was successfully used to selectively switch the accelerated release rate on and off. By combining the tuning of drug loading (through tailored nanoparticle synthesis) and drug release rate (through electrical stimulus protocols), we demonstrate a highly advanced control of drug delivery dosage in a biocompatible delivery vehicle. This work highlights the significant potential of electroactive organic nanoparticles for implantable devices that can deliver corticosteroids directly to the nervous system for the treatment of inflammation associated with neurological disorders, presenting a translatable pathway toward precision nanomedicine approaches for other drugs and diseases.
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Nova |
2021 |
Sherwood CP, Elkington DC, Dickinson MR, Belcher WJ, Dastoor PC, Feron K, et al., 'Organic semiconductors for optically triggered neural interfacing: The impact of device architecture in determining response magnitude and polarity', IEEE Journal of Selected Topics in Quantum Electronics, 27 (2021) [C1]
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Nova |
2020 |
Cave JM, Courtier NE, Blakborn IA, Jones TW, Ghosh D, Anderson KF, et al., 'Deducing transport properties of mobile vacancies from perovskite solar cell characteristics', Journal of Applied Physics, 128 (2020) [C1]
The absorber layers in perovskite solar cells possess a high concentration of mobile ion vacancies. These vacancies undertake thermally activated hops between neighboring lattice ... [more]
The absorber layers in perovskite solar cells possess a high concentration of mobile ion vacancies. These vacancies undertake thermally activated hops between neighboring lattice sites. The mobile vacancy concentration N 0 is much higher and the activation energy E A for ion hops is much lower than is seen in most other semiconductors due to the inherent softness of perovskite materials. The timescale at which the internal electric field changes due to ion motion is determined by the vacancy diffusion coefficient D v and is similar to the timescale on which the external bias changes by a significant fraction of the open-circuit voltage at typical scan rates. Therefore, hysteresis is often observed in which the shape of the current-voltage, J-V, characteristic depends on the direction of the voltage sweep. There is also evidence that this defect migration plays a role in degradation. By employing a charge transport model of coupled ion-electron conduction in a perovskite solar cell, we show that E A for the ion species responsible for hysteresis can be obtained directly from measurements of the temperature variation of the scan-rate dependence of the short-circuit current and of the hysteresis factor H. This argument is validated by comparing E A deduced from measured J-V curves for four solar cell structures with density functional theory calculations. In two of these structures, the perovskite is MAPbI 3, where MA is methylammonium, CH 3 NH 3; the hole transport layer (HTL) is spiro (spiro-OMeTAD, 2,2 ',7,7 '- tetrakis[N,N-di(4-methoxyphenyl) amino]-9,9 '-spirobifluorene) and the electron transport layer (ETL) is TiO 2 or SnO 2. For the third and fourth structures, the perovskite layer is FAPbI 3, where FA is formamidinium, HC (NH 2) 2, or MAPbBr 3, and in both cases, the HTL is spiro and the ETL is SnO 2. For all four structures, the hole and electron extracting electrodes are Au and fluorine doped tin oxide, respectively. We also use our model to predict how the scan rate dependence of the power conversion efficiency varies with E A, N 0, and parameters determining free charge recombination.
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Nova |
2020 |
Salunke J, Singh A, He D, Pham HD, Bai Y, Wang L, et al., 'Fluorination of pyrene-based organic semiconductors enhances the performance of light emitting diodes and halide perovskite solar cells', Organic Electronics, 77 (2020) [C1]
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Nova |
2020 |
Liu Q, Wang Y, Kohara A, Matsumoto H, Manzhos S, Feron K, et al., 'Tuning the Charge Carrier Polarity of Organic Transistors by Varying the Electron Affinity of the Flanked Units in Diketopyrrolopyrrole-Based Copolymers', Advanced Functional Materials, 30 (2020) [C1]
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Nova |
2020 |
Liu Q, Kanahashi K, Matsuki K, Manzhos S, Feron K, Bottle SE, et al., 'Triethylene Glycol Substituted Diketopyrrolopyrrole- and Isoindigo-Dye Based Donor Acceptor Copolymers for Organic Light-Emitting Electrochemical Cells and Transistors', Advanced Electronic Materials, 6 (2020) [C1]
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Nova |
2020 |
Nicolaidis NC, Hollott PV, Stanwell B, Gill IA, Bull JE, Bentsen S, et al., 'Developing a Portable Organic Solar Cell Kit Suitable for Students to Fabricate and Test Solar Cells in the Laboratory', Journal of Chemical Education, 97 3751-3757 (2020) [C1]
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Nova |
2020 |
Liu Q, Kumagai S, Manzhos S, Chen Y, Angunawela I, Nahid MM, et al., 'Synergistic Use of Pyridine and Selenophene in a Diketopyrrolopyrrole-Based Conjugated Polymer Enhances the Electron Mobility in Organic Transistors', Advanced Functional Materials, 30 (2020) [C1]
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Nova |
2020 |
Liu Q, Wang Y, Arunagiri L, Khatib M, Manzhos S, Feron K, et al., 'Versatile nature of anthanthrone based polymers as active multifunctional semiconductors for various organic electronic devices', Materials Advances, 1 3428-3438 (2020) [C1]
The versatility of anthanthrone-based materials in organic electronics is exploited by synthesizing four polymers, PANT, PANT-TBO, PANT-TBT, and PANT-TffBT. PANT represents the se... [more]
The versatility of anthanthrone-based materials in organic electronics is exploited by synthesizing four polymers, PANT, PANT-TBO, PANT-TBT, and PANT-TffBT. PANT represents the self-coupled homopolymer, while the other three are D-A (donor-acceptor) type copolymers. Each of them is successfully applied in three different devices, namely organic field-effect transistors (OFETs), organic photovoltaic cells (OPVs), and chemical sensors. The results indicate that anthanthrone could be a very promising building block for the construction of semiconductors for multi-purpose applications. Specifically, the four polymers exhibit p-type properties in OFETs with hole mobility values in the range of 10-4-10-3 cm2 V-1 s-1. In OPVs, the power conversion efficiencies (PCEs) of non-fullerene cells have a wide range from 0.28% to 5.21%. This indicates that the efficiency may reach a higher value via further structural modification by selecting suitable comonomers to produce new polymers. Additionally, based on the parameters of the OFET sensor devices and the variation in the backbone structures of the four polymers, they show varying response trends for four chemicals: octane, toluene, isopropanol and acetic acid, indicating the important role of the structural composition in generating different chemical sensitivities and fingerprints for sensing. Overall, we clearly disclose the potential of four new anthanthrone-based polymers in various types of electronic devices. This journal is
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Nova |
2020 |
Liu Q, Wang Y, Ren Y, Kohara A, Matsumoto H, Chen Y, et al., 'Diketopyrrolopyrrole-Based Dual-Acceptor Copolymers to Realize Tunable Charge Carrier Polarity of Organic Field-Effect Transistors and High-Performance Nonvolatile Ambipolar Flash Memories', ACS APPLIED ELECTRONIC MATERIALS, 2 1609-1618 (2020) [C1]
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Nova |
2020 |
Liu Q, Chavhan S, Zhang H, Sun H, Brock AJ, Manzhos S, et al., 'Short Alkyl Chain Engineering Modulation on Naphthalene Flanked Diketopyrrolopyrrole toward High-Performance Single Crystal Transistors and Organic Thin Film Displays', ADVANCED ELECTRONIC MATERIALS, 7 (2020) [C1]
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Nova |
2020 |
Darwis D, Sesa E, Ulum S, Holmes NP, Feron K, Thameel M, et al., 'Role of Morphology of Surfactant-Free Nanoparticles in Organic Photovoltaics', Journal of Electronic Materials, 49 4168-4179 (2020) [C1]
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Nova |
2020 |
Pham HD, Jain SM, Li M, Wang ZK, Manzhos S, Feron K, et al., 'All-Rounder Low-Cost Dopant-Free D-A-D Hole-Transporting Materials for Efficient Indoor and Outdoor Performance of Perovskite Solar Cells', Advanced Electronic Materials, 6 (2020) [C1]
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Nova |
2020 |
Al-Ahmad AY, Almayhi F, Al-Mudhaffer MF, Griffith MJ, Liu W, Li S, et al., 'A nuanced approach for assessing OPV materials for large scale applications', Sustainable Energy and Fuels, 4 940-949 (2020) [C1]
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Nova |
2020 |
Singh A, Wolff A, Yambem SD, Esmaeili M, Riches JD, Shahbazi M, et al., 'Biowaste-Derived, Self-Organized Arrays of High-Performance 2D Carbon Emitters for Organic Light-Emitting Diodes', Advanced Materials, 32 (2020) [C1]
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Nova |
2019 |
Ameri M, Al-Mudhaffer MF, Almyahi F, Fardell GC, Marks M, Al-Ahmad A, et al., 'Role of Stabilizing Surfactants on Capacitance, Charge, and Ion Transport in Organic Nanoparticle-Based Electronic Devices', ACS APPLIED MATERIALS & INTERFACES, 11 10074-10088 (2019) [C1]
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Nova |
2019 |
Pham HD, Gil-Escrig L, Feron K, Manzhos S, Albrecht S, Bolink HJ, Sonar P, 'Boosting inverted perovskite solar cell performance by using 9,9-bis(4-diphenylaminophenyl)fluorene functionalized with triphenylamine as a dopant-free hole transporting material', JOURNAL OF MATERIALS CHEMISTRY A, 7 12507-12517 (2019) [C1]
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Nova |
2019 |
Marks M, Holmes NP, Sharma A, Pan X, Chowdhury R, Barr MG, et al., 'Building intermixed donor-acceptor architectures for water-processable organic photovoltaics', Physical Chemistry Chemical Physics, 21 5705-5715 (2019) [C1]
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Nova |
2019 |
Pham HD, Jain SM, Li M, Manzhos S, Feron K, Pitchaimuthu S, et al., 'Dopant-free novel hole-transporting materials based on quinacridone dye for high-performance and humidity-stable mesoporous perovskite solar cells', Journal of Materials Chemistry A, 7 5315-5323 (2019) [C1]
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Nova |
2019 |
Almyahi F, Andersen TR, Fahy A, Dickinson M, Feron K, Belcher WJ, Dastoor PC, 'The role of surface energy control in organic photovoltaics based on solar paints', Journal of Materials Chemistry A, 7 9202-9214 (2019) [C1]
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Nova |
2019 |
Liu Q, Sun H, Ponnappa SP, Peron K, Manzhos S, Jones MWM, et al., 'Naphthalene flanked diketopyrrolopyrrole: A new DPP family member and its comparative optoelectronic properties with thiophene- and furan-flanked DPP counterparts', ORGANIC ELECTRONICS, 74 290-298 (2019)
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2018 |
Hong DP, Thu TD, Kim J, Charbonneau C, Manzhos S, Feron K, et al., 'Molecular Engineering Using an Anthanthrone Dye for Low-Cost Hole Transport Materials: A Strategy for Dopant-Free, High-Efficiency, and Stable Perovskite Solar Cells', ADVANCED ENERGY MATERIALS, 8 (2018) [C1]
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Nova |
2018 |
Liu Q, Sun H, Blaikie C, Caporale C, Manzhos S, Feron K, et al., 'Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors', New Journal of Chemistry, 42 12374-12385 (2018) [C1]
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Nova |
2018 |
Yao Z, Jones TW, Grigore M, Duffy NW, Anderson KF, Dunbar RB, et al., 'Tunable Crystallization and Nucleation of Planar CH3NH3PbI3 through Solvent-Modified Interdiffusion', ACS APPLIED MATERIALS & INTERFACES, 10 14673-14683 (2018)
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2018 |
Al-Mudhaffer MF, Griffith MJ, Feron K, Nicolaidis NC, Cooling NA, Zhou X, et al., 'The origin of performance limitations in miniemulsion nanoparticulate organic photovoltaic devices', SOLAR ENERGY MATERIALS AND SOLAR CELLS, 175 77-88 (2018) [C1]
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Nova |
2018 |
Almyahi F, Andersen TR, Cooling NA, Holmes NP, Griffith MJ, Feron K, et al., 'Optimisation of purification techniques for the preparation of large-volume aqueous solar nanoparticle inks for organic photovoltaics', BEILSTEIN JOURNAL OF NANOTECHNOLOGY, 9 649-659 (2018) [C1]
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Nova |
2018 |
Liu Q, Surendran A, Feron K, Manzhos S, Jiao X, McNeill CR, et al., 'Diketopyrrolopyrrole based organic semiconductors with different numbers of thiophene units: symmetry tuning effect on electronic devices', NEW JOURNAL OF CHEMISTRY, 42 4773-4773 (2018)
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2018 |
Thu TD, Patil BB, Singh SP, Yambem SD, Feron K, Ostrikov KK, et al., 'Vinylene and benzo[c][1,2,5]thiadiazole: effect of the pi-spacer unit on the properties of bis(2-oxoindolin-3-ylidene)-benzodifuran-dione containing polymers for n-channel organic field-effect transistors', RSC ADVANCES, 8 38919-38928 (2018) [C1]
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Nova |
2018 |
Holmes NP, Marks M, Cave JM, Feron K, Barr MG, Fahy A, et al., 'Engineering Two-Phase and Three-Phase Microstructures from Water-Based Dispersions of Nanoparticles for Eco-Friendly Polymer Solar Cell Applications', Chemistry of Materials, 30 6521-6531 (2018) [C1]
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Nova |
2018 |
Liu Q, Sun H, Blaikie C, Caporale C, Manzhos S, Feron K, et al., 'Naphthalene flanked diketopyrrolopyrrole based organic semiconductors for high performance organic field effect transistors (vol 42, pg 12374, 2018)', NEW JOURNAL OF CHEMISTRY, 42 16384-16384 (2018)
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2018 |
Sesa E, Vaughan B, Feron K, Bilen C, Zhou X, Belcher W, Dastoor P, 'A building-block approach to the development of an equivalent circuit model for organic photovoltaic cells', Organic Electronics: physics, materials, applications, 58 207-215 (2018) [C1]
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Nova |
2018 |
Pham HD, Hayasake K, Kim J, Do TT, Matsui H, Manzhos S, et al., 'One step facile synthesis of a novel anthanthrone dye-based, dopant-free hole transporting material for efficient and stable perovskite solar cells', Journal of Materials Chemistry C, 6 3699-3708 (2018) [C1]
Perovskite solar cell (PSCs) technology has made a tremendous impact in the solar cell community due to the exceptional performance of PSCs as the power conversion efficiency (PCE... [more]
Perovskite solar cell (PSCs) technology has made a tremendous impact in the solar cell community due to the exceptional performance of PSCs as the power conversion efficiency (PCE) surged to a world record of 22% within the last few years. Despite this high efficiency value, the commercialization of PSCs for large area applications at affordable prices is still pending due to the low stability of the devices under ambient atmospheric conditions and the very high cost of the hole transporting materials (HTMs) used as the charge transporting layer in these devices. To cope with these challenges, the use of cheap HTMs can play a dual role in terms of lowering the overall cost of perovskite technology as well as protecting the perovskite layer to achieve a higher stability. To achieve these goals, various new organic hole transporting materials (HTMs) have been proposed. In this study, we used a unique and novel anthanthrone (ANT) dye as a conjugated core building block and an affordable moiety to synthesize a new HTM. The commercially available dye was functionalized with an extended diphenylamine (DPA) end capping group. The newly developed HTM, named DPA-ANT-DPA, was synthesized in a single step and used successfully in mesoporous perovskite solar cell devices, achieving a PCE of 11.5% under 1 Sun condition with impressive stability. The obtained device efficiency is amongst the highest as compared to that of other D-A-D molecular design and low band gap devices. This kind of low cost HTM based on an inexpensive starting precursor, anthanthrone dye, paves the way for the economical and large-scale production of stable perovskite solar cells.
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Nova |
2018 |
Feron K, Lim R, Sherwood C, Keynes A, Brichta A, Dastoor PC, 'Organic Bioelectronics: Materials and Biocompatibility.', International Journal of Molecular Sciences, 19 (2018) [C1]
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Nova |
2018 |
Pham HD, Hu H, Wong FL, Lee CS, Chen WC, Feron K, et al., 'Acene-based organic semiconductors for organic light-emitting diodes and perovskite solar cells', Journal of Materials Chemistry C, 6 9017-9029 (2018) [C1]
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Nova |
2018 |
Liu Q, Surendran A, Feron K, Manzhos S, Jiao X, McNeill CR, et al., 'Diketopyrrolopyrrole based organic semiconductors with different numbers of thiophene units: Symmetry tuning effect on electronic devices', New Journal of Chemistry, 42 4017-4028 (2018) [C1]
Diketopyrrolopyrrole (DPP) has been drawing considerable attention for constructing semiconducting materials used in organic optoelectronic applications, mainly for organic field ... [more]
Diketopyrrolopyrrole (DPP) has been drawing considerable attention for constructing semiconducting materials used in organic optoelectronic applications, mainly for organic field effect transistor (OFET) and organic photovoltaic (OPV) devices. In the present work, we study the effects of varying the number of thiophene units (from four to six) attached to DPP on the physical, chemical, and optoelectronic properties by designing and synthesizing a series of small molecule organic semiconductors. The thermal and optical properties, and electronic energy levels of these molecular semiconductors are studied, and their performance in organic field effect transistor devices (OFETs) compared. These small molecules exhibit promising charge carrier mobility and behave as p-type semiconductors. Hole mobility increases with conjugation length and degree of symmetry of the backbone. By adjusting the number of thiophene units on each side of DPP, the hole mobility is enhanced by almost one order of magnitude, from 1.18 × 10-4 to 1.11 × 10-3 cm2 V-1 s-1. Density functional theory (DFT) calculations indicate that increasing the number of homo-coupled thiophene results in a relatively planar configuration, while the terminal alkoxyl benzene unit causes significant torsional rotation which could hamper electron and hole transport in active layer.
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Nova |
2017 |
Valsange NG, Wong FL, Shinde D, Lee CS, Roy VAL, Manzhos S, et al., 'A new pyrene cored small organic molecule with a flexible alkyl spacer: A potential solution processable blue emitter with bright photoluminescence', New Journal of Chemistry, 41 11383-11390 (2017)
A new pyrene cored small organic molecule viz. 1,3,6,8-tetrakis(4-((5-(9H-carbazol-9-yl)pentyl)oxy)phenyl)pyrene (PY-II) was designed and synthesized. The carbazole moiety with an... [more]
A new pyrene cored small organic molecule viz. 1,3,6,8-tetrakis(4-((5-(9H-carbazol-9-yl)pentyl)oxy)phenyl)pyrene (PY-II) was designed and synthesized. The carbazole moiety with an alkyl spacer was introduced at 1, 3, 6 and 8 positions of the pyrene core to improve the charge transport properties and solution processability. PY-II exhibited excellent solubility in common organic solvents and high thermal stability up to 345 °C. The photoluminescence quantum yield (PLQY) of PY-II in solution was found to be 0.9 with bright blue emission near 450 nm which is just appropriate for the human eye. The solution processed non-doped OLED device fabricated using PY-II as an emissive layer afforded a pure blue emission with CIE coordinates of 0.16 and 0.16, a power efficiency of 0.17 lm W-1, a maximum current efficiency of 0.41 cd A-1 and a maximum brightness of 202 cd m-2.
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2017 |
Chen H, Lyu M, Zhang M, Feron K, Searles DJ, Dargusch M, et al., 'Switched Photocurrent on Tin Sulfide-Based Nanoplate Photoelectrodes', CHEMSUSCHEM, 10 670-674 (2017) [C1]
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Nova |
2017 |
Feron K, Thameel MN, Al-Mudhaffer MF, Zhou X, Belcher WJ, Fell CJ, Dastoor PC, 'Energy level engineering in ternary organic solar cells: Evaluating exciton dissociation at organic semiconductor interfaces', APPLIED PHYSICS LETTERS, 110 (2017) [C1]
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Nova |
2017 |
Do TT, Rundel K, Gu Q, Gann E, Manzhos S, Feron K, et al., '9-Fluorenone and 9,10-anthraquinone potential fused aromatic building blocks to synthesize electron acceptors for organic solar cells', New Journal of Chemistry, 41 2899-2909 (2017)
In this work, for the first time we used two novel fused aromatic conjugated electron withdrawing moieties 9-fluorenone and 9,10-anthraquinone, respectively, to design two non-ful... [more]
In this work, for the first time we used two novel fused aromatic conjugated electron withdrawing moieties 9-fluorenone and 9,10-anthraquinone, respectively, to design two non-fullerene acceptors and evaluated their viability in solution-processable organic solar cells (OSCs). 9-Fluorenone and 9,10-anthraquinone were used as core electron withdrawing blocks in combination with another common strong electron accepting diketopyrrolopyrrole (DPP) end-capping group. The compounds 6,6'-(5,5'-(9-oxo-9H-fluorene-2,7-diyl)bis(thiophene-5,2-diyl))bis(2,5-bis(2-butyloctyl)-3-(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione) (DPP-FN-DPP) and 6,6'-(5,5'-(9,10-dioxo-9,10-dihydroanthracene-2,6-diyl)bis(thiophene-5,2-diyl))bis(2,5-bis(2-butyloctyl)-3-(thiophen-2-yl)pyrrolo[3,4-c]pyrrole-1,4(2H,5H)-dione) (DPP-ANQ-DPP) were synthesized via a Suzuki coupling reaction and characterized completely. The new acceptors exhibit good solubility in common organic solvents and good thermal stability with 5% weight loss above 360 °C. DPP-FN-DPP and DPP-ANQ-DPP possess a broad absorption band at 300-700 nm with optical band-gaps of 1.75 and 1.71 eV, respectively. The use of different core acceptor building blocks resulted in a difference in LUMO and HOMO energy levels. Inverted OSC devices employing P3HT as the donor polymer and DPP-FN-DPP and DPP-ANQ-DPP as acceptors yielded quite high open-circuit voltages (VOC) of 0.85-0.98 V, benefiting from the relatively low-lying LUMO energy levels of the two acceptors. Among both, OSC devices based on DPP-FN-DPP as acceptor exhibits the highest performance with a VOC of 0.97 V, a short-circuit current density (JSC) of 3.2 mA cm-2, a fill factor (FF) of 37%, and an overall power conversion efficiency of 1.2%.
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2017 |
Hong DP, Wu Z, Ono LK, Manzhos S, Feron K, Motta N, et al., 'Low-Cost Alternative High-Performance Hole-Transport Material for Perovskite Solar Cells and Its Comparative Study with Conventional SPIRO-OMeTAD', ADVANCED ELECTRONIC MATERIALS, 3 (2017) [C1]
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Nova |
2017 |
Pham HD, Hu H, Feron K, Manzhos S, Wang H, Lam YM, Sonar P, 'Thienylvinylenethienyl and Naphthalene Core Substituted with Triphenylamines-Highly Efficient Hole Transporting Materials and Their Comparative Study for Inverted Perovskite Solar Cells', SOLAR RRL, 1 (2017) [C1]
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Nova |
2016 |
Andersen TR, Cooling NA, Almyahi F, Hart AS, Nicolaidis NC, Feron K, et al., 'Fully roll-to-roll prepared organic solar cells in normal geometry with a sputter-coated aluminium top-electrode', Solar Energy Materials and Solar Cells, 149 103-109 (2016) [C1]
We demonstrate a pathway for fully roll-to-roll (R2R) prepared organic solar cells in a normal geometry with a R2R sputtered aluminium top electrode. Initial attempts utilizing a ... [more]
We demonstrate a pathway for fully roll-to-roll (R2R) prepared organic solar cells in a normal geometry with a R2R sputtered aluminium top electrode. Initial attempts utilizing a stack geometry without an electron transport layer (ETL) failed to obtain working devices. By applying aluminium zinc oxide (AZO) as an ETL, and optimizing the AZO thickness, working printed OPV devices with an efficiency of 0.58% were obtained. Further optimization of the donor:acceptor ratio in the active layer increased the efficiency to 0.90%. This work demonstrates that normal geometry organic solar cells using a metal top contact can be produced using large scale production techniques.
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Nova |
2016 |
Holmes NP, Marks M, Kumar P, Kroon R, Barr MG, Nicolaidis N, et al., 'Nano-pathways: Bridging the divide between water-processable nanoparticulate and bulk heterojunction organic photovoltaics', Nano Energy, 19 495-510 (2016) [C1]
Here we report the application of a conjugated copolymer based on thiophene and quinoxaline units, namely poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diy... [more]
Here we report the application of a conjugated copolymer based on thiophene and quinoxaline units, namely poly[2,3-bis-(3-octyloxyphenyl)quinoxaline-5,8-diyl-alt-thiophene-2,5-diyl] (TQ1), to nanoparticle organic photovoltaics (NP-OPVs). TQ1 exhibits more desirable material properties for NP-OPV fabrication and operation, particularly a high glass transition temperature (Tg) and amorphous nature, compared to the commonly applied semicrystalline polymer poly(3-hexylthiophene) (P3HT). This study reports the optimisation of TQ1:PC71BM (phenyl C71 butyric acid methyl ester) NP-OPV device performance by the application of mild thermal annealing treatments in the range of the Tg (sub-Tg and post-Tg), both in the active layer drying stage and post-cathode deposition annealing stage of device fabrication, and an in-depth study of the effect of these treatments on nanoparticle film morphology. In addition, we report a type of morphological evolution in nanoparticle films for OPV active layers that has not previously been observed, that of PC71BM nano-pathway formation between dispersed PC71BM-rich nanoparticle cores, which have the benefit of making the bulk film more conducive to charge percolation and extraction.
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Nova |
2016 |
Lyu M, Zhang M, Cooling NA, Jiao Y, Wang Q, Yun J-H, et al., 'Highly compact and uniform CH3NH3Sn0.5Pb0.5I3 films for efficient panchromatic planar perovskite solar cells', SCIENCE BULLETIN, 61 1558-1562 (2016) [C1]
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Nova |
2016 |
Sulaiman K, Ali AY, Elkington D, Feron K, Anderson KF, Belcher W, et al., 'Matrix assisted low temperature growth of graphene', Carbon, 107 325-331 (2016) [C1]
Single layer graphene has been successfully grown via chemical vapour deposition (CVD) at low temperature by using chlorobenzene trapped in a PMMA polymer matrix as the carbon sou... [more]
Single layer graphene has been successfully grown via chemical vapour deposition (CVD) at low temperature by using chlorobenzene trapped in a PMMA polymer matrix as the carbon source. By varying the carbon source temperature, we are able to vary the dominant carbon source from just chlorobenzene to PMMA. Raman spectroscopy and atomic force microscopy (AFM) have been used to characterize the as-grown graphene layer, while scanning electron microscopy (SEM) and transmission electron microscopy (TEM) have been used to characterize film quality and growth dynamics. Lower source temperatures (corresponding to a chlorobenzene carbon source) result in high quality single layer graphene whereas higher source temperatures (PMMA carbon source) produce disordered multilayered graphene films. SEM imaging reveals that a preferential surface mediated edge growth mechanism for single layer graphene is observed as a function of growth time. This development offers a new methodology for graphene synthesis at low temperatures with implications for the development of printed graphene structures.
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Nova |
2016 |
Feron K, Cave JM, Thameel MN, O'Sullivan C, Kroon R, Andersson MR, et al., 'Utilizing Energy Transfer in Binary and Ternary Bulk Heterojunction Organic Solar Cells', ACS APPLIED MATERIALS & INTERFACES, 8 20928-20937 (2016) [C1]
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2016 |
Cooling NA, Barnes EF, Almyahi F, Feron K, Al-Mudhaffer MF, Al-Ahmad A, et al., 'A low-cost mixed fullerene acceptor blend for printed electronics', Journal of Materials Chemistry A, 4 10274-10281 (2016) [C1]
The synthesis and performance of a cost-effective mixed fullerene at the 100+ g scale with a reaction yield of 85% is demonstrated. The cost to convert a fullerene such as C60 int... [more]
The synthesis and performance of a cost-effective mixed fullerene at the 100+ g scale with a reaction yield of 85% is demonstrated. The cost to convert a fullerene such as C60 into the mixed acceptor blend is less than $1 g-1. The photovoltaic performance of the mixed acceptor is demonstrated in both small scale and roll-to-roll printed devices.
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2016 |
Andersen TR, Almyahi F, Cooling NA, Elkington D, Wiggins L, Fahy A, et al., 'Comparison of inorganic electron transport layers in fully roll-to-roll coated/printed organic photovoltaics in normal geometry', Journal of Materials Chemistry A, 4 15986-15996 (2016) [C1]
We investigate the suitability of four different inorganic materials (chromium oxide (CrOX), titanium oxide (TiOX), aluminium doped zinc oxide (AZO) and zinc oxide (ZnO)) as elect... [more]
We investigate the suitability of four different inorganic materials (chromium oxide (CrOX), titanium oxide (TiOX), aluminium doped zinc oxide (AZO) and zinc oxide (ZnO)) as electrode transport layers in fully roll-to-roll (R2R) fabricated P3HT:ICxA organic solar cells. CrOX and TiOX were found to be unsuitable, as the CrOX devices did not exhibit rectifying behaviour while the TiOX devices did not withstand the annealing conditions. Of the last two ETLs, ZnO showed by far the most promise with devices demonstrating an average efficiency of 2.2%, which is the highest reported value for R2R devices in normal geometry, and a significantly extended lifetime compared with AZO devices under ISOS-L-2 conditions.
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2016 |
Salunke JK, Wong FL, Feron K, Manzhos S, Lo MF, Shinde D, et al., 'Phenothiazine and carbazole substituted pyrene based electroluminescent organic semiconductors for OLED devices', JOURNAL OF MATERIALS CHEMISTRY C, 4 1009-1018 (2016) [C1]
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Nova |
2015 |
Holmes NP, Nicolaidis N, Feron K, Barr M, Burke KB, Al-Mudhaffer M, et al., 'Probing the origin of photocurrent in nanoparticulate organic photovoltaics', SOLAR ENERGY MATERIALS AND SOLAR CELLS, 140 412-421 (2015) [C1]
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2014 |
Kumar P, Bilen C, Feron K, Nicolaidis NC, Gong BB, Zhou X, et al., 'Comparative Degradation and Regeneration of Polymer Solar Cells with Different Cathodes', ACS APPLIED MATERIALS & INTERFACES, 6 5281-5289 (2014) [C1]
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2014 |
Feron K, Ulum S, Sesa E, Gong BB, Belcher WJ, Zhou X, et al., 'The effect of calcium-induced fullerene migration on the performance of thermally stable nanoparticle organic solar cells', Journal of Applied Physics, 116 (2014) [C1]
The impact of a calcium interface layer in combination with a thermal annealing treatment on the performance of poly(3-hexylthiophene) (P3HT):[6,6]-phenyl-C61-buteric acid methyle... [more]
The impact of a calcium interface layer in combination with a thermal annealing treatment on the performance of poly(3-hexylthiophene) (P3HT):[6,6]-phenyl-C61-buteric acid methylester (PCBM) nanoparticle photovoltaic devices is investigated. Annealing is found to disrupt the microstructure of the nanoparticle active layer leading to a reduction in fill factor. However, X-ray photoelectron spectroscopy measurements show that the calcium interface layer causes PCBM to preferentially migrate to the cathode interface upon annealing, resulting in better charge extraction from the PCBM moiety, an increase in the built-in voltage, open-circuit voltage, and power conversion efficiency. Moreover, the annealing trends could be completely explained by the observed PCBM migration. Unlike P3HT:PCBM bulk heterojunction devices, the P3HT:PCBM nanoparticle devices showed a remarkable thermal stability up to 120°C. As such, OPVs fabricated from aqueous nanoparticle inks provide an attractive alternative to conventional organic solvent based bulk heterojunction devices.
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2014 |
Kumar P, Bilen C, Feron K, Zhou X, Belcher WJ, Dastoor PC, 'Enhanced regeneration of degraded polymer solar cells by thermal annealing', APPLIED PHYSICS LETTERS, 104 (2014) [C1]
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Nova |
2014 |
Nicolaidis N, Vaughan B, Mulligan CJ, Bryant G, Zillger T, Trnovec B, et al., 'Solution processable interface materials for nanoparticulate organic photovoltaic devices', Applied Physics Letters, 104 (2014) [C1]
Nanoparticulate zinc oxide can be prepared at low temperatures from solution processable zinc acetylacetonate. The use of this material as a cathode interfacial layer in nanoparti... [more]
Nanoparticulate zinc oxide can be prepared at low temperatures from solution processable zinc acetylacetonate. The use of this material as a cathode interfacial layer in nanoparticulate organic photovoltaic devices results in comparable performances to those based on reactive calcium layers. Importantly, the enhanced degradation stability and full solution processability make zinc oxide a more desirable material for the fabrication of large area printed devices. © 2014 AIP Publishing LLC.
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2014 |
Feron K, Zhou X, Belcher WJ, Fell CJ, Dastoor PC, 'A dynamic Monte Carlo study of anomalous current voltage behaviour in organic solar cells', Journal of Applied Physics, 116 (2014) [C1]
We present a dynamic Monte Carlo (DMC) study of s-shaped current-voltage (I-V) behaviour in organic solar cells. This anomalous behaviour causes a substantial decrease in fill fac... [more]
We present a dynamic Monte Carlo (DMC) study of s-shaped current-voltage (I-V) behaviour in organic solar cells. This anomalous behaviour causes a substantial decrease in fill factor and thus power conversion efficiency. We show that this s-shaped behaviour is induced by charge traps that are located at the electrode interface rather than in the bulk of the active layer, and that the anomaly becomes more pronounced with increasing trap depth or density. Furthermore, the s-shape anomaly is correlated with interface recombination, but not bulk recombination, thus highlighting the importance of controlling the electrode interface. While thermal annealing is known to remove the s-shape anomaly, the reason has been not clear, since these treatments induce multiple simultaneous changes to the organic solar cell structure. The DMC modelling indicates that it is the removal of aluminium clusters at the electrode, which act as charge traps, that removes the anomalous I-V behaviour. Finally, this work shows that the s-shape becomes less pronounced with increasing electron-hole recombination rate; suggesting that efficient organic photovoltaic material systems are more susceptible to these electrode interface effects.
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2014 |
Jones TW, Feron K, Anderson KF, Duck BC, Wilson GJ, 'An applied light-beam induced current study of dye-sensitised solar cells: Photocurrent uniformity mapping and true photoactive area evaluation', JOURNAL OF APPLIED PHYSICS, 116 (2014) [C1]
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2013 |
Feron K, Ulum S, Holmes NP, Kilcoyne ALD, Belcher WJ, Zhou X, et al., 'Modelling transport in nanoparticle organic solar cells using Monte Carlo methods', APPLIED PHYSICS LETTERS, 103 (2013) [C1]
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Nova |
2013 |
Feron K, Nagle TJ, Rozanski LJ, Gong BB, Fell CJ, 'Spatially resolved photocurrent measurements of organic solar cells: Tracking water ingress at edges and pinholes', Solar Energy Materials and Solar Cells, 109 169-177 (2013) [C1]
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Nova |
2012 |
Feron K, Fell CJ, Rozanski LJ, Gong BB, Nicolaidis NC, Belcher WJ, et al., 'Towards the development of a virtual organic solar cell: An experimental and dynamic Monte Carlo study of the role of charge blocking layers and active layer thickness', Applied Physics Letters, 101 (2012) [C1]
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Nova |
2012 |
Feron K, Zhou X, Belcher WJ, Dastoor PC, 'Exciton transport in organic semiconductors: Forster resonance energy transfer compared with a simple random walk', Journal of Applied Physics, 111 (2012) [C1]
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Nova |
2012 |
Feron K, Belcher WJ, Fell CJ, Dastoor PC, 'Organic solar cells: Understanding the role of Forster resonance energy transfer', International Journal of Molecular Sciences, 13 17019-17047 (2012) [C1]
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