Publications
637 results found
Xiao M, Kang B, Lee SB, et al., 2020, Anisotropy of Charge Transport in a Uniaxially Aligned Fused Electron-Deficient Polymer Processed by Solution Shear Coating, ADVANCED MATERIALS, Vol: 32, ISSN: 0935-9648
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- Citations: 34
Muellen K, McCulloch I, Reetz MT, 2020, New EurASC Members, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 59, Pages: 8327-8327, ISSN: 1433-7851
Matta M, Wu R, Paulsen BD, et al., 2020, Ion Coordination and Chelation in a Glycolated Polymer Semiconductor: Molecular Dynamics and X-Ray Fluorescence Study
<jats:p><p>Organic electrochemical transistors (OECTs) are based on the doping of a semiconducting polymer by an electrolyte. Due to their ability to conjugate volumetric ion penetration with high hole mobility and charge density, polythiophenes bearing glycolated side chains have rapidly surged as the highest performing materials for OECTs; amongst them, p(g2T-TT) is amongst those with the highest figure of merit. While recent studies have shown how different doping anions tend to affect the polymer microstructure, only a handful of electrolytes have been tested in mixed conduction devices. Our work provides an atomistic picture of the p(g2T-TT) -electrolyte interface in the ‘off’ state of an OECT, expected to be dominated by cation-polymer interactions. Using a combination of molecular dynamics simulations and X-ray fluorescence, we show how different anions effectively tune the coordination and chelation of cations by glycolated polymers. At the same time, softer and hydrophobic anions such as TFSI and ClO<sub>4</sub> are found to preferentially interact with the p(g2T-TT) phase, further enhancing polymer-cation coordination. Besides opening the way for a full study of electrolyte doping mechanisms in operating devices, our results suggest that tailoring the electrolyte for different applications and materials might be a viable strategy to tune the performance of mixed conducting devices.</p></jats:p>
Matta M, Wu R, Paulsen BD, et al., 2020, Ion Coordination and Chelation in a Glycolated Polymer Semiconductor: Molecular Dynamics and X-Ray Fluorescence Study
<jats:p>Organic electrochemical transistors (OECTs) are based on the doping of a semiconducting polymer by an electrolyte. Due to their ability to conjugate volumetric ion penetration with high hole mobility and charge density, polythiophenes bearing glycolated side chains have rapidly surged as the highest performing materials for OECTs; amongst them, p(g2T-TT) is amongst those with the highest figure of merit. While recent studies have shown how different doping anions tend to affect the polymer microstructure, only a handful of electrolytes have been tested in mixed conduction devices. Our work provides an atomistic picture of the p(g2T-TT) -electrolyte interface in the ‘off’ state of an OECT, expected to be dominated by cation-polymer interactions. Using a combination of molecular dynamics simulations and X-ray fluorescence, we show how different anions effectively tune the coordination and chelation of cations by glycolated polymers. At the same time, softer and hydrophobic anions such as TFSI and ClO<jats:sub>4</jats:sub> are found to preferentially interact with the p(g2T-TT) phase, further enhancing polymer-cation coordination. Besides opening the way for a full study of electrolyte doping mechanisms in operating devices, our results suggest that tailoring the electrolyte for different applications and materials might be a viable strategy to tune the performance of mixed conducting devices.</jats:p>
Gasparini N, Paleti HK, Bertrandie J, et al., 2020, Exploiting Ternary Blends for Improved Photostability in High-Efficiency Organic Solar Cells, ACS ENERGY LETTERS, Vol: 5, Pages: 1371-1379, ISSN: 2380-8195
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- Citations: 111
Woods DJ, Hillman S, Pearce D, et al., 2020, Side-chain tuning in conjugated polymer photocatalysts for improved hydrogen production from water, Energy & Environmental Science, Vol: 13, Pages: 1843-1855, ISSN: 1754-5692
Structure–property–activity relationships in solution processable polymer photocatalysts for hydrogen production from water were probed by varying the chemical structure of both the polymer side-chains and the polymer backbone. In both cases, the photocatalytic performance depends strongly on the inclusion of more polar groups, such as dibenzo[b,d]thiophene sulfone backbone units or oligo(ethylene glycol) side-chains. We used optical, spectroscopic, and structural characterisation techniques to understand the different catalytic activities of these systems. We find that although polar groups improve the wettability of the material with water in all cases, backbone and side-chain modifications affect photocatalytic performance in different ways: the inclusion of dibenzo[b,d]thiophene sulfone backbone units improves the thermodynamic driving force for hole transfer to the sacrificial donor, while the inclusion of oligo ethylene glycol side-chains aids the degree of polymer swelling and also extends the electron polaron lifetime. The best performing material, FS-TEG, exhibits a HER of 72.5 μmol h−1 for 25 mg photocatalyst (2.9 mmol g−1 h−1) when dispersed in the presence of a sacrificial donor and illuminated with λ > 420 nm light, corresponding to a hydrogen evolution EQE of 10% at 420 nm. When cast as a thin film, this HER was further boosted to 13.9 mmol g−1 h−1 (3.0 mmol m−2 h−1), which is among the highest rates in this field.
Wu X, Surendran A, Moser M, et al., 2020, Universal Spray-Deposition Process for Scalable, High-Performance, and Stable Organic Electrochemical Transistors, ACS APPLIED MATERIALS & INTERFACES, Vol: 12, Pages: 20757-20764, ISSN: 1944-8244
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- Citations: 42
Han D, Khan Y, Ting J, et al., 2020, Pulse Oximetry Using Organic Optoelectronics under Ambient Light, ADVANCED MATERIALS TECHNOLOGIES, Vol: 5, ISSN: 2365-709X
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- Citations: 40
Kosco J, Bidwell M, Cha H, et al., 2020, Enhanced photocatalytic hydrogen evolution from organic semiconductor heterojunction nanoparticles, Nature Materials, Vol: 19, Pages: 559-565, ISSN: 1476-1122
Photocatalysts formed from a single organic semiconductor typically suffer from inefficient intrinsic charge generation, which leads to low photocatalytic activities. We demonstrate that incorporating a heterojunction between a donor polymer (PTB7-Th) and non-fullerene acceptor (EH-IDTBR) in organic nanoparticles (NPs) can result in hydrogen evolution photocatalysts with greatly enhanced photocatalytic activity. Control of the nanomorphology of these NPs was achieved by varying the stabilizing surfactant employed during NP fabrication, converting it from a core–shell structure to an intermixed donor/acceptor blend and increasing H2 evolution by an order of magnitude. The resulting photocatalysts display an unprecedentedly high H2 evolution rate of over 60,000 µmol h−1 g−1 under 350 to 800 nm illumination, and external quantum efficiencies over 6% in the region of maximum solar photon flux.
Giovannitti A, Rashid RB, Thiburce Q, et al., 2020, Energetic control of redox-active polymers toward safe organic Bioelectronic materials, Advanced Materials, Vol: 32, ISSN: 0935-9648
Avoiding faradaic side reactions during the operation of electrochemical devices is important to enhance the device stability, to achieve low power consumption, and to prevent the formation of reactive side‐products. This is particularly important for bioelectronic devices, which are designed to operate in biological systems. While redox‐active materials based on conducting and semiconducting polymers represent an exciting class of materials for bioelectronic devices, they are susceptible to electrochemical side‐reactions with molecular oxygen during device operation. Here, electrochemical side reactions with molecular oxygen are shown to occur during organic electrochemical transistor (OECT) operation using high‐performance, state‐of‐the‐art OECT materials. Depending on the choice of the active material, such reactions yield hydrogen peroxide (H2O2), a reactive side‐product, which may be harmful to the local biological environment and may also accelerate device degradation. A design strategy is reported for the development of redox‐active organic semiconductors based on donor–acceptor copolymers that prevents the formation of H2O2 during device operation. This study elucidates the previously overlooked side‐reactions between redox‐active conjugated polymers and molecular oxygen in electrochemical devices for bioelectronics, which is critical for the operation of electrolyte‐gated devices in application‐relevant environments.
Lin Y, Firdaus Y, Nugraha MI, et al., 2020, 17.1% Efficient Single-Junction Organic Solar Cells Enabled by n-Type Doping of the Bulk-Heterojunction, ADVANCED SCIENCE, Vol: 7
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- Citations: 167
Ohayon D, Nikiforidis G, Savva A, et al., 2020, Biofuel powered glucose detection in bodily fluids with an n-type conjugated polymer, NATURE MATERIALS, Vol: 19, Pages: 456-+, ISSN: 1476-1122
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- Citations: 137
Savva A, Hallani R, Cendra C, et al., 2020, Balancing Ionic and Electronic Conduction for High-Performance Organic Electrochemical Transistors, ADVANCED FUNCTIONAL MATERIALS, Vol: 30, ISSN: 1616-301X
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- Citations: 108
Waldrip M, Iqbal HF, Wadsworth A, et al., 2020, Organic thin-film transistors with flame-annealed contacts, FLEXIBLE AND PRINTED ELECTRONICS, Vol: 5, ISSN: 2058-8585
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- Citations: 4
Lv J, Feng Y, Fu J, et al., 2020, Energetic Disorder and Activation Energy in Efficient Ternary Organic Solar Cells with Nonfullerene Acceptor Eh-IDTBR as the Third Component, SOLAR RRL, Vol: 4, ISSN: 2367-198X
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- Citations: 46
Bronstein H, Nielsen CB, Schroeder BC, et al., 2020, The role of chemical design in the performance of organic semiconductors, NATURE REVIEWS CHEMISTRY, Vol: 4, Pages: 66-77
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- Citations: 352
Hamid Z, Wadsworth A, Rezasoltani E, et al., 2020, Influence of Polymer Aggregation and Liquid Immiscibility on Morphology Tuning by Varying Composition in PffBT4T-2DT/Nonfullerene Organic Solar Cells, ADVANCED ENERGY MATERIALS, Vol: 10, ISSN: 1614-6832
Wadsworth A, Chen H, Thorley KJ, et al., 2020, Modification of Indacenodithiophene-Based Polymers and Its Impact on Charge Carrier Mobility in Organic Thin-Film Transistors, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 142, Pages: 652-664, ISSN: 0002-7863
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- Citations: 84
Keivanidis PE, Itskos G, Kan Z, et al., 2020, Afterglow Effects as a Tool to Screen Emissive Nongeminate Charge Recombination Processes in Organic Photovoltaic Composites, ACS APPLIED MATERIALS & INTERFACES, Vol: 12, Pages: 2695-2707, ISSN: 1944-8244
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- Citations: 4
Hallani RK, Moser M, Bristow H, et al., 2020, Low-Temperature Cross-Linking Benzocyclobutene Based Polymer Dielectric for Organic Thin Film Transistors on Plastic Substrates, JOURNAL OF ORGANIC CHEMISTRY, Vol: 85, Pages: 277-283, ISSN: 0022-3263
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- Citations: 13
Troughton J, Neophytou M, Gasparini N, et al., 2020, A universal solution processed interfacial bilayer enabling ohmic contact in organic and hybrid optoelectronic devices, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 13, Pages: 268-276, ISSN: 1754-5692
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- Citations: 36
Pace NA, Korovina N, Clikeman TT, et al., 2020, Slow charge transfer from pentacene triplet states at the Marcus optimum, NATURE CHEMISTRY, Vol: 12, Pages: 63-70, ISSN: 1755-4330
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- Citations: 31
Rekab W, Leydecker T, Hou L, et al., 2020, Phototuning Selectively Hole and Electron Transport in Optically Switchable Ambipolar Transistors, ADVANCED FUNCTIONAL MATERIALS, Vol: 30, ISSN: 1616-301X
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- Citations: 23
Gladisch J, Stavrinidou E, Ghosh S, et al., 2020, Conjugated Polymers: Reversible Electronic Solid–Gel Switching of a Conjugated Polymer (Adv. Sci. 2/2020), Advanced Science, Vol: 7, ISSN: 2198-3844
Gladisch J, Stavrinidou E, Ghosh S, et al., 2020, Reversible Electronic Solid-Gel Switching of a Conjugated Polymer, ADVANCED SCIENCE, Vol: 7
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- Citations: 37
Wang Y, Zeglio E, Liao H, et al., 2019, Hybrid Alkyl-Ethylene Glycol Side Chains Enhance Substrate Adhesion and Operational Stability in Accumulation Mode Organic Electrochemical Transistors, CHEMISTRY OF MATERIALS, Vol: 31, Pages: 9797-9806, ISSN: 0897-4756
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- Citations: 75
Seitkhan A, Neophytou M, Kirkus M, et al., 2019, Use of the Phen-NaDPO:Sn(SCN)<sub>2</sub> Blend as Electron Transport Layer Results to Consistent Efficiency Improvements in Organic and Hybrid Perovskite Solar Cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 29, ISSN: 1616-301X
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- Citations: 39
Chen H, Wadsworth A, Ma C, et al., 2019, The Effect of Ring Expansion in Thienobenzo[<i>b</i>]indacenodithiophene Polymers for Organic Field-Effect Transistors, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 141, Pages: 18806-18813, ISSN: 0002-7863
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- Citations: 38
Xiang H, Hu Z, Billot L, et al., 2019, Heavy-Metal-Free Flexible Hybrid Polymer-Nanocrystal Photodetectors Sensitive to 1.5 μm Wavelength, ACS APPLIED MATERIALS & INTERFACES, Vol: 11, Pages: 42571-42579, ISSN: 1944-8244
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- Citations: 10
Ugur E, Khan JI, Aydin E, et al., 2019, Carrier Extraction from Perovskite to Polymeric Charge Transport Layers Probed by Ultrafast Transient Absorption Spectroscopy, JOURNAL OF PHYSICAL CHEMISTRY LETTERS, Vol: 10, Pages: 6921-6928, ISSN: 1948-7185
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- Citations: 19
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