Publications
286 results found
Reichsöllner E, Creamer A, Cong S, et al., 2019, Fast and selective post-polymerization modification of conjugated polymers using dimethyldioxirane, Frontiers in Chemistry, Vol: 7, ISSN: 2296-2646
Modification of functional groups attached to conjugated polymer backbones can drastically alter the material properties. Oxidation of electron-donating thioalkyl substituents to electron-withdrawing sulfoxides or sulfones is a particularly effective modification. However, so far, this reaction has not been studied for the modification of conjugated polymers used in organic electronics. Crucial questions regarding selectivity and reaction time waited to be addressed. Here, we show that the reaction is highly selective and complete within just a few minutes when using dimethyldioxirane (DMDO) for the oxidation of thioalkyl substituents attached to the well-investigated conjugated polymers poly(9-(1-octylnonyl)carbazole-alt-4,7-dithienylbenzothiadiazole) (PCDTBT) and poly(9,9-dioctylfluorene-alt-benzothiadiazole) (F8BT). The selectivity was confirmed by comparison with polymers obtained from pre-oxidized monomers and by control experiments using related polymers without thioalkyl substituents. Using DMDO, the oxidation yields acetone as the only side-product, which reduces the work-up to mere evaporation of solvents and excessive reagent. Our results show that this oxidation is an exciting method for the preparation of electron-deficient conjugated polymers. It may even allow the preparation of electron acceptors for solar cells directly from the electron donors.
Sun G, Shahid M, Fei Z, et al., 2019, Highly-efficient semi-transparent organic solar cells utilising non-fullerene acceptors with optimised multilayer MoO <inf>3</inf> /Ag/MoO <inf>3</inf> electrodes, Materials Chemistry Frontiers, Vol: 3, Pages: 450-455
© 2019 the Partner Organisations. We report the optimisation of a semi-transparent solar cell based on a blend of a recently reported high performance donor polymer (PFBDB-T) with a non-fullerene acceptor derivative (C8-ITIC). The performance is shown to strongly depend on the nature of the semi-transparent electrode, and we report the optimal fabrication conditions for a multilayer MoO 3 /Ag/MoO 3 electrode. The effect of deposition rate and layer thickness of both the Ag and the outer MoO 3 on transparency and sheet resistance is investigated, and is shown to have a significant impact on the overall device performance. The optimised PFBDB-T:C8-ITIC based devices exhibit an average power conversion efficiency (PCE) of 9.2% with an average visible transmittance (AVT) of 22%.
Rimmele M, Ableidinger K, Marsh AV, et al., 2019, Thioalkyl- and sulfone-substituted poly(p-phenylene vinylene)s, POLYMER CHEMISTRY, Vol: 10, Pages: 738-750, ISSN: 1759-9954
Krauspe P, Tsokkou D, Causa M, et al., 2018, Terahertz short-range mobilities in neat and intermixed regions of polymer: fullerene blends with controlled phase morphology, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 6, Pages: 22301-22309, ISSN: 2050-7488
Rimmele M, Ableidinger K, Marsh A, et al., 2018, Thioalkyl- and Sulfone-Substituted Poly(p-Phenylene Vinylene)s
Poly(p-phenylene vinylene)s (PPVs) have been studied for decades, but research on this interesting class of conjugated polymers is far from being completed. New applications like in bioimaging keep emerging and even simple structural variations are still waiting to be explored. Surprisingly, not even dithioalkyl-substituted PPVs (S-PPVs) have been reported in the peer-reviewed literature, although the corresponding dialkoxy-substituted PPVs (O-PPVs) like MEH-PPV or MDMO-PPV are most frequently used and although thioalkyl substituents can improve the material properties significantly. We herein report the development of a highly efficient, scalable two-step synthesis of Gilch monomers for S-PPVs starting from low-cost 1,4-diiodobenzene. A low-temperature polymerization protocol has been developed for these monomers, affording high-molecular weight S-PPVs in excellent yields. The thermal, electrochemical, and photophysical properties of S-PPVs are reported to highlight the potential of these polymers. Furthermore, treatment with dimethyldioxirane is demonstrated to result in rapid conversion into sulfone-substituted PPVs (SO<sub>2</sub>-PPVs), introducing a route to high-molecular weight SO<sub>2</sub>-PPVs with exceptional stability and solid-state photoluminescence quantum yields of up to 0.46.
Boufflet P, Bovo G, Occhi L, et al., 2018, The Influence of Backbone Fluorination on the Dielectric Constant of Conjugated Polythiophenes, ADVANCED ELECTRONIC MATERIALS, Vol: 4, ISSN: 2199-160X
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- Citations: 2
Paterson AF, Lin Y-H, Mottram AD, et al., 2018, The Impact of Molecular p-Doping on Charge Transport in High-Mobility Small-Molecule/Polymer Blend Organic Transistors, ADVANCED ELECTRONIC MATERIALS, Vol: 4, ISSN: 2199-160X
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- Citations: 8
Paterson AF, Singh S, Fallon KJ, et al., 2018, Recent Progress in High-Mobility Organic Transistors: A Reality Check, ADVANCED MATERIALS, Vol: 30, ISSN: 0935-9648
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- Citations: 11
Patra D, Lee J, Dey S, et al., 2018, Chalcogen Bridged Thieno- and Selenopheno[2,3-d:5,4-d ']bisthiazole and Their Diketopyrrolopyrrole Based Low-Bandgap Copolymers, MACROMOLECULES, Vol: 51, Pages: 6076-6084, ISSN: 0024-9297
Marsh AV, Cheetham NJ, Little M, et al., 2018, Carborane-Induced Excimer Emission of Severely Twisted Bis-o-Carboranyl Chrysene, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 57, Pages: 10640-10645, ISSN: 1433-7851
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- Citations: 5
Creamer A, Wood CS, Howes PD, et al., 2018, Post-polymerisation functionalisation of conjugated polymer backbones and its application in multifunctional emissive nanoparticles, NATURE COMMUNICATIONS, Vol: 9, ISSN: 2041-1723
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- Citations: 1
Rodriquez D, Kohl JG, Morel P, et al., 2018, Measurement of Cohesion and Adhesion of Semiconducting Polymers by Scratch Testing: Effect of Side-Chain Length and Degree of Polymerization, ACS MACRO LETTERS, Vol: 7, Pages: 1003-1009, ISSN: 2161-1653
Nieuwendaal RC, DeLongchamp DM, Richter LJ, et al., 2018, Characterization of Interfacial Structure in Polymer-Fullerene Bulk Heterojunctions via C-13 {H-2} Rotational Echo Double Resonance NMR, PHYSICAL REVIEW LETTERS, Vol: 121, ISSN: 0031-9007
Eisner F, Seitkhan A, Han Y, et al., 2018, Solution-Processed In2O3/ZnO Heterojunction Electron Transport Layers for Efficient Organic Bulk Heterojunction and Inorganic Colloidal Quantum-Dot Solar Cells, SOLAR RRL, Vol: 2, ISSN: 2367-198X
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- Citations: 3
Datko BD, Walwark DJ, Fei Z, et al., 2018, Resolving Anomalous Heavy Atom Effects from Discrete Triplet Mediated Photochemistry Events on Single Conjugated Polymer Chains, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 122, Pages: 9718-9725, ISSN: 1932-7447
Squeo BM, Gregoriou VG, Han Y, et al., 2018, alpha,beta-Unsubstituted meso-positioning thienyl BODIPY: a promising electron deficient building block for the development of near infrared (NIR) p-type donor-acceptor (D-A) conjugated polymers, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 6, Pages: 4030-4040, ISSN: 2050-7526
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- Citations: 2
Taroni PJ, Santagiuliana G, Wan K, et al., 2018, Toward Stretchable Self-Powered Sensors Based on the Thermoelectric Response of PEDOT:PSS/Polyurethane Blends, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X
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- Citations: 12
Wijeyasinghe N, Tsetseris L, Regoutz A, et al., 2018, Copper (I) Selenocyanate (CuSeCN) as a Novel Hole-Transport Layer for Transistors, Organic Solar Cells, and Light-Emitting Diodes, ADVANCED FUNCTIONAL MATERIALS, Vol: 28, ISSN: 1616-301X
Datko B, Fei Z, Heeney M, et al., 2018, Effect of conformational changes on triplet formation in a heavy heteroatom conjugated polymer: Single polymer molecules and molecular aggregates, 255th National Meeting and Exposition of the American-Chemical-Society (ACS) - Nexus of Food, Energy, and Water, Publisher: AMER CHEMICAL SOC, ISSN: 0065-7727
Charlton RJ, Fogarty RM, Bogatko S, et al., 2018, Implicit and explicit host effects on excitons in pentacene derivatives, JOURNAL OF CHEMICAL PHYSICS, Vol: 148, ISSN: 0021-9606
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- Citations: 1
Fei Z, Eisner FD, Jiao X, et al., 2018, An Alkylated Indacenodithieno[3,2-b]thiophene-Based Nonfullerene Acceptor with High Crystallinity Exhibiting Single Junction Solar Cell Efficiencies Greater than 13% with Low Voltage Losses, ADVANCED MATERIALS, Vol: 30, ISSN: 0935-9648
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- Citations: 136
Lu R, Han Y, Zhang W, et al., 2018, Alkylated indacenodithieno[3,2-b] thiophene-based all donor ladder-type conjugated polymers for organic thin film transistors, Journal of Materials Chemistry C, Vol: 6, Pages: 2004-2009, ISSN: 2050-7534
We report the synthesis of a series of indacenodithieno[3,2-b]thiophene (IDTT) based conjugated polymers by copolymerization with three different electron rich co-monomers [thiophene (T), thieno[3,2-b] thiophene (TT) and dithieno[3,2-b:2′,3′-d]thiophene (DTT)] under Stille coupling conditions. The resulting all-donor polymers show very good solubility in common solvents and exhibit similar optical, thermal and electronic properties. However, the performance of these semiconductors in thin film transistor devices varied and was highly dependent on the nature of the co-monomer. All polymers exhibited unipolar p-type charge transport behaviour, with the mobility values following the trend of IDTT-TT > IDTT-DTT > IDTT-T. The peak saturation mobility value of IDTT-TT was extracted to be 1.1 cm 2 V -1 s -1 , amongst the highest mobility for all-donor conjugated polymers reported to date.
Panidi J, Paterson AF, Khim D, et al., 2018, Remarkable Enhancement of the Hole Mobility in Several Organic Small-Molecules, Polymers, and Small-Molecule:Polymer Blend Transistors by Simple Admixing of the Lewis Acid p-Dopant B(C6F5)(3), ADVANCED SCIENCE, Vol: 5, ISSN: 2198-3844
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- Citations: 10
Datko BD, Thomas AK, Fei Z, et al., 2017, Effect of a heavy heteroatom on triplet formation and interactions in single conjugated polymer molecules and aggregates, PHYSICAL CHEMISTRY CHEMICAL PHYSICS, Vol: 19, Pages: 28239-28248, ISSN: 1463-9076
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- Citations: 4
Wade J, Wood S, Collado-Fregoso E, et al., 2017, Impact of Fullerene Intercalation on Structural and Thermal Properties of Organic Photovoltaic Blends, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 121, Pages: 20976-20985, ISSN: 1932-7447
Wijeyasinghe N, Regoutz A, Eisner F, et al., 2017, Copper(I) Thiocyanate (CuSCN) Hole-Transport Layers Processed from Aqueous Precursor Solutions and Their Application in Thin-Film Transistors and Highly Efficient Organic and Organometal Halide Perovskite Solar Cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 27, ISSN: 1616-301X
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- Citations: 32
Green JP, Cryer SJ, Marafie J, et al., 2017, Synthesis of a Luminescent Arsolo[2,3-d:5,4-d']bis(thiazole) Building Block and Comparison to Its Phosphole Analogue, ORGANOMETALLICS, Vol: 36, Pages: 2632-2636, ISSN: 0276-7333
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- Citations: 10
Fei Z, Han Y, Gann E, et al., 2017, Alkylated Selenophene-Based Ladder-Type Monomers via a Facile Route for High-Performance Thin-Film Transistor Applications, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 139, Pages: 8552-8561, ISSN: 0002-7863
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- Citations: 22
Fei Z, Chen L, Han Y, et al., 2017, Alternating 5,5-Dimethylcyclopentadiene and Diketopyrrolopyrrole Copolymer Prepared at Room Temperature for High Performance Organic Thin-Film Transistors, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 139, Pages: 8094-8097, ISSN: 0002-7863
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- Citations: 16
Hu Z, Haws RT, Fei Z, et al., 2017, Impact of backbone fluorination on nanoscale morphology and excitonic coupling in polythiophenes, PROCEEDINGS OF THE NATIONAL ACADEMY OF SCIENCES OF THE UNITED STATES OF AMERICA, Vol: 114, Pages: 5113-5118, ISSN: 0027-8424
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- Citations: 10
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