Imperial College London

ProfessorMartinHeeney

Faculty of Natural SciencesDepartment of Chemistry

Professor of Organic Materials
 
 
 
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Contact

 

+44 (0)20 7594 1248m.heeney Website

 
 
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Location

 

401GMolecular Sciences Research HubWhite City Campus

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Summary

 

Publications

Publication Type
Year
to

341 results found

Yoo D-J, Heeney M, Glöcklhofer F, Choi JWet al., 2021, Tetradiketone macrocycle for divalent aluminium ion batteries., Nat Commun, Vol: 12

Contrary to early motivation, the majority of aluminium ion batteries developed to date do not utilise multivalent ion storage; rather, these batteries rely on monovalent complex ions for their main redox reaction. This limitation is somewhat frustrating because the innate advantages of metallic aluminium such as its low cost and high air stability cannot be fully taken advantage of. Here, we report a tetradiketone macrocycle as an aluminium ion battery cathode material that reversibly reacts with divalent (AlCl2+) ions and consequently achieves a high specific capacity of 350 mAh g-1 along with a lifetime of 8000 cycles. The preferred storage of divalent ions over their competing monovalent counterparts can be explained by the relatively unstable discharge state when using monovalent AlCl2+ ions, which exert a moderate resonance effect to stabilise the structure. This study opens an avenue to realise truly multivalent aluminium ion batteries based on organic active materials, by tuning the relative stability of discharged states with carrier ions of different valence states.

Journal article

Adamczak D, Perinot A, Komber H, Illy A, Hultmark S, Passarella B, Tan WL, Hutsch S, Becker-Koch D, Rapley C, Scaccabarozzi AD, Heeney M, Vaynzof Y, Ortmann F, McNeill CR, Mueller C, Caironi M, Sommer Met al., 2021, Influence of synthetic pathway, molecular weight and side chains on properties of indacenodithiophene-benzothiadiazole copolymers made by direct arylation polycondensation, JOURNAL OF MATERIALS CHEMISTRY C, ISSN: 2050-7526

Journal article

Paterson AF, Li R, Markina A, Tsetseris L, MacPhee S, Faber H, Emwas A-H, Panidi J, Bristow H, Wadsworth A, Baran D, Andrienko D, Heeney M, McCulloch I, Anthopoulos TDet al., 2021, N-Doping improves charge transport and morphology in the organic non-fullerene acceptor O-IDTBR dagger, JOURNAL OF MATERIALS CHEMISTRY C, ISSN: 2050-7526

Journal article

Heeney M, Kafourou P, Park B, Luke J, Luxi T, Panidi J, Glöcklhofer F, Kim J, Anthopoulos TD, Kim J-S, Lee K, Kwon Set al., 2021, One-step six-fold cyanation of benzothiadiazole acceptor Units for air-stable high-performance n-type organic field-effect transistors, Angewandte Chemie International Edition, Vol: 60, Pages: 5970-5977, ISSN: 1433-7851

We report a new high electron affinity acceptor end group for organic semiconductors, 2,1,3-benzothiadiazole-4,5,6-tricarbonitrile (TCNBT). An n-type organic semiconductor with an indacenodithiophene (IDT) core and TCNBT end groups was synthesized by a six-fold nucleophilic substitution with cyanides on a fluorinated precursor, itself prepared by a direct arylation approach. This one-step chemical modification was found to significantly impact the molecular properties: the fluorinated precursor, TFBT IDT, a poor ambipolar semiconductor, was converted into TCNBT IDT, a good n-type semiconductor. The highly electron-deficient end group TCNBT dramatically decreased the energy of the highest occupied and lowest unoccupied molecular orbitals (HOMO/LUMO) compared to the fluorinated analogue and improved the molecular orientation when utilized in n-type organic field-effect transistors (OFETs). Solution-processed OFETs based on TCNBT IDT exhibited a charge carrier mobility of up to µ e ≈ 0.15 cm 2 V -1 s -1 with excellent ambient stability for 100 hours, highlighting the benefits of the cyanated end group and the synthetic approach.

Journal article

Kafourou P, Park B, Luke J, Tan L, Panidi J, Glöcklhofer F, Kim J, Anthopoulos TD, Kim J, Lee K, Kwon S, Heeney Met al., 2021, One‐step sixfold cyanation of benzothiadiazole acceptor units for air‐stable high‐performance n‐type organic field‐effect transistors, Angewandte Chemie, Vol: 133, Pages: 6035-6042, ISSN: 0044-8249

Reported here is a new high electron affinity acceptor end group for organic semiconductors, 2,1,3‐benzothiadiazole‐4,5,6‐tricarbonitrile (TCNBT). An n‐type organic semiconductor with an indacenodithiophene (IDT) core and TCNBT end groups was synthesized by a sixfold nucleophilic substitution with cyanide on a fluorinated precursor, itself prepared by a direct arylation approach. This one‐step chemical modification significantly impacted the molecular properties: the fluorinated precursor, TFBT IDT, a poor ambipolar semiconductor, was converted into TCNBT IDT, a good n‐type semiconductor. The electron‐deficient end group TCNBT dramatically decreased the energy of the highest occupied and lowest unoccupied molecular orbitals (HOMO/LUMO) compared to the fluorinated analogue and improved the molecular orientation when utilized in n‐type organic field‐effect transistors (OFETs). Solution‐processed OFETs based on TCNBT IDT exhibited a charge‐carrier mobility of up to μe≈0.15 cm2 V−1 s−1 with excellent ambient stability for 100 hours, highlighting the benefits of the cyanated end group and the synthetic approach.

Journal article

Hodsden T, Thorley KJ, Basu A, White AJP, Wang C, Mitchell W, Glocklhofer F, Anthopoulos TD, Heeney Met al., 2021, The influence of alkyl group regiochemistry and backbone fluorination on the packing and transistor performance of N-cyanoimine functionalised indacenodithiophenes, Materials Advances, Vol: 2, Pages: 1706-1714

The synthesis of two novel n-type molecular organic semiconductors based on a fluorinated indacenodithiophene core in combination with an electron withdrawing N-cyanoimine group is reported, and the influence of the regiochemistry of the solubilizing sidechain is investigated. The N-cyanoimine is confirmed to be a strongly electron accepting group, which in combination with the core fluorination resulted in high electron affinities for both materials. Single crystal analysis demonstrated that whilst both materials arrange in ordered slipped stacks with close π–π stacking distances (∼3.40 Å), significant differences in electron transfer integrals for the two regioisomers were observed, relating to differences in relative molecular displacement along the π-stacking direction. Organic thin-film transistors fabricated via blade-coating displayed electron mobility up to 0.13 cm2 V−1 s−1 for the isomer with the larger transfer integral.

Journal article

Rodriguez-Martinez X, Pascual-San-Jose E, Fei Z, Heeney M, Guimera R, Campoy-Quiles Met al., 2021, Predicting the photocurrent-composition dependence in organic solar cells, ENERGY & ENVIRONMENTAL SCIENCE, Vol: 14, Pages: 986-994, ISSN: 1754-5692

Journal article

Marsh AV, Little M, Cheetham NJ, Dyson MJ, Bidwell M, White AJP, Warriner CN, Swain AC, McCulloch I, Stavrinou PN, Heeney Met al., 2020, Highly Deformed o-Carborane Functionalised Non-linear Polycyclic Aromatics with Exceptionally Long C-C Bonds, CHEMISTRY-A EUROPEAN JOURNAL, Vol: 27, Pages: 1970-1975, ISSN: 0947-6539

Journal article

Lin Y, Nugraha MI, Firdaus Y, Scaccabarozzi AD, Anies F, Emwas A-H, Yengel E, Zheng X, Liu J, Wahyudi W, Yarali E, Faber H, Bakr OM, Tsetseris L, Heeney M, Anthopoulos TDet al., 2020, A Simple n-Dopant Derived from Diquat Boosts the Efficiency of Organic Solar Cells to 18.3%, ACS ENERGY LETTERS, Vol: 5, Pages: 3663-3671, ISSN: 2380-8195

Journal article

Basu A, Niazi MR, Scaccabarozzi AD, Faber H, Fei Z, Anjum DH, Paterson AF, Boltalina O, Heeney M, Anthopoulos TDet al., 2020, Impact of p-type doping on charge transport in blade-coated small-molecule:polymer blend transistors, JOURNAL OF MATERIALS CHEMISTRY C, Vol: 8, Pages: 15368-15376, ISSN: 2050-7526

Journal article

He Q, Eisner FD, Pearce D, Hodsden T, Rezasoltani E, Medranda D, Fei Z, Nelson J, Heeney Met al., 2020, Ring fusion in tetrathienylethene cored perylene diimide tetramers affords acceptors with strong and broad absorption in the near-UV to visible region, Journal of Materials Chemistry C, Vol: 8, Pages: 17237-17244, ISSN: 2050-7526

In this work, we designed and synthesized two novel perylene diimide (PDI) tetramers based on a tetrathienylethene core, named TTE-PDI4 and FTTE-PDI4, and investigated their application as non-fullerene acceptors for organic photovoltaics. The free rotation of PDIs and adjacent thiophene units renders TTE-PDI4 with a highly twisted molecular geometry. The ring fusion of TTE-PDI4 yields FTTE-PDI4, a more rigid molecule with increased intramolecular stacking. Interestingly, TTE-PDI4 and FTTE-PDI4 possess similar energy levels but very different UV-Vis absorptions, with the latter showing strong broad-band absorption with multiple sharp peaks in the 300–600 nm region. Through time-dependent density functional theory (TD-DFT) calculations, we show that this broad absorption spectrum in FTTE-PDI4 arises from the combination of multiple bright transitions in the visible region with a strong vibronic progression, tentatively assigned to the dominant C[double bond, length as m-dash]C stretching mode. TTE-PDI4, despite having a lower energy absorption onset, shows weaker absorption at long wavelengths. Due to its higher absorption as well as its increased rigidity, FTTE-PDI4 shows a higher photocurrent and hence a higher power conversion efficiency (PCE), of 6.6%, when blended with the polymer donor PFBDB-T than TTE-PDI4 based blends (PCE of 3.8%). The greater rigidity of FTTE-PDI4 is likely to contribute to the good fill factor of the blend devices. Potential for further improvement through reducing voltage losses is identified.

Journal article

Cong S, Creamer A, Fei Z, Hillman SAJ, Rapley C, Nelson J, Heeney Met al., 2020, Tunable control of the hydrophilicity and wettability of conjugated polymers by a postpolymerization modification approach., Macromolecular Bioscience, Vol: 20, Pages: 1-8, ISSN: 1616-5187

A facile method to prepare hydrophilic polymers by a postpolymerization nucleophillic aromatic substitution reaction of fluoride on an emissive conjugated polymer (CP) backbone is reported. Quantitative functionalization by a series of monofunctionalized ethylene glycol oligomers, from dimer to hexamer, as well as with high molecular weight polyethylene glycol is demonstrated. The length of the ethylene glycol sidechains is shown to have a direct impact on the surface wettability of the polymer, as well as its solubility in polar solvents. However, the energetics and band gap of the CPs remain essentially constant. This method therefore allows an easy way to modulate the wettability and solubility of CP materials for a diverse series of applications.

Journal article

Tang Y, Bjuggren JM, Fei Z, Andersson MR, Heeney M, McNeill CRet al., 2020, Origin of Open-Circuit Voltage Turnover in Organic Solar Cells at Low Temperature, SOLAR RRL, Vol: 4, ISSN: 2367-198X

Journal article

Scaccabarozzi AD, Scuratti F, Barker AJ, Basu A, Paterson AF, Fei Z, Solomeshch O, Petrozza A, Tessler N, Heeney M, Anthopoulos TD, Caironi Met al., 2020, Understanding charge transport in high-mobilityp-doped multicomponent blend organic transistors, Advanced Electronic Materials, Pages: 1-9, ISSN: 2199-160X

The use of ternary systems comprising polymers, small molecules, and molecular dopants represents a promising approach for the development of high‐mobility, solution‐processed organic transistors. However, the current understanding of the charge transport in these complex systems, and particularly the role of molecular doping, is rather limited. Here, the role of the individual components in enhancing hole transport in the best‐performing ternary blend systems comprising the small molecule 2,7‐dioctyl[1]benzothieno[3,2‐b][1]benzothiophene (C8‐BTBT), the conjugated polymer indacenodithiophene‐alt‐benzothiadiazole (C16IDT‐BT), and the molecular p‐type dopant (C60F48) is investigated. Temperature‐dependent charge transport measurements reveal different charge transport regimes depending on the blend composition, crossing from a thermally activated to a band‐like behavior. Using the charge‐modulation spectroscopy technique, it is shown that in the case of the pristine blend, holes relax onto the conjugated polymer phase where shallow traps dominate carrier transport. Addition of a small amount of C60F48 deactivates those shallow traps allowing for a higher degree of hole delocalization within the highly crystalline C8‐BTBT domains located on the upper surface of the blend film. Such synergistic effect of a highly ordered C8‐BTBT phase, a polymer bridging grain boundaries, and p‐doping results in the exceptionally high hole mobilities and band‐like transport observed in this blend system.

Journal article

Wang S, Shaw J, Han Y, Fei Z, Glöcklhofer F, Heeney Met al., 2020, Multibranched aliphatic side chains for π-conjugated polymers with a high density of ‘unshielded’ aromatics, Chemical Communications, Vol: 56, Pages: 12138-12141, ISSN: 1359-7345

Strongly solubilising multibranched aliphatic side chains for π-conjugated polymers are reported, enabling soluble polymers with a high density of unsubstituted, ‘unshielded’ aromatics.

Journal article

Zhang D, Heeney M, 2020, Organic Donor-Acceptor Systems, ASIAN JOURNAL OF ORGANIC CHEMISTRY, Vol: 9, Pages: 1251-1251, ISSN: 2193-5807

Journal article

Green JP, Dai H, Anies F, Heeney Met al., 2020, Functional 4H-Dithieno[3,2-b:2 ',3 '-d]pyrrole Derivatives in Base-Dopable Conjugated Polymers and Oligomers, MACROMOLECULES, Vol: 53, Pages: 6649-6655, ISSN: 0024-9297

Journal article

Anies F, Wang S, Hodsden T, Panidi J, Fei Z, Jiao X, Wong YHC, McNeill CR, Anthopoulos TD, Heeney Met al., 2020, A Structurally Simple but High-Performing Donor-Acceptor Polymer for Field-Effect Transistor Applications, ADVANCED ELECTRONIC MATERIALS, Vol: 6, ISSN: 2199-160X

Journal article

Eder S, Yoo D-J, Nogala W, Pletzer M, Santana Bonilla A, White AJP, Jelfs KE, Heeney M, Choi JW, Glöcklhofer Fet al., 2020, Switching between local and global aromaticity in a conjugated macrocycle for high-performance organic sodium-ion battery anodes, Angewandte Chemie International Edition, Vol: 59, Pages: 12958-12964, ISSN: 1433-7851

Aromatic organic compounds can be used as electrode materials in rechargeable batteries and are expected to advance the development of both anode and cathode materials for sodium-ion batteries (SIBs). However, most aromatic organic compounds assessed as anode materials in SIBs to date exhibit significant degradation issues under fast-charge/discharge conditions and unsatisfying long-term cycling performance. Now, a molecular design concept is presented for improving the stability of organic compounds for battery electrodes. The molecular design of the investigated compound, [2.2.2.2]paracyclophane-1,9,17,25-tetraene (PCT), can stabilize the neutral state by local aromaticity and the doubly reduced state by global aromaticity, resulting in an anode material with extraordinarily stable cycling performance and outstanding performance under fast-charge/discharge conditions, demonstrating an exciting new path for the development of electrode materials for SIBs and other types of batteries.

Journal article

Guo D, Li L, Zhu X, Heeney M, Li J, Dong L, Yu Q, Gan Z, Gu X, Tan Let al., 2020, Naphthalene diimide based near-infrared luminogens with aggregation-induced emission characteristics for biological imaging and high mobility ambipolar transistors, SCIENCE CHINA-CHEMISTRY, Vol: 63, Pages: 1198-1207, ISSN: 1674-7291

Journal article

Marsh A, Dyson MJ, Cheetham NJ, Bidwell M, Little M, White AJP, Warriner CN, Swain AC, McCulloch I, Stavrinou PN, Meskers SCJ, Heeney Met al., 2020, Correlating the Structural and Photophysical Properties ofOrtho,Meta, andPara-Carboranyl-Anthracene Dyads, ADVANCED ELECTRONIC MATERIALS, Vol: 6, ISSN: 2199-160X

Journal article

Meindl B, Pfennigbauer K, Stöger B, Heeney M, Glöcklhofer Fet al., 2020, Double ring-closing approach for the synthesis of 2,3,6,7-substituted anthracene derivatives., Journal of Organic Chemistry, Vol: 85, Pages: 8240-8244, ISSN: 0022-3263

A method for the synthesis of 2,3,6,7-substituted anthracene derivatives, one of the most challenging anthracene substitution patterns to obtain, is presented. The method is exemplified by the preparation of 2,3,6,7-anthracenetetracarbonitrile and employs a newly developed, stable, protected 1,2,4,5-benzenetetracarbaldehyde as the precursor. The precursor can be obtained in two scalable synthetic steps from 2,5-dibromoterephthalaldehyde and is converted into the anthracene derivative by a double intermolecular Wittig reaction under very mild conditions, followed by a deprotection and intramolecular double ring-closing condensation reaction.

Journal article

Lin Y-H, Huang W, Pattanasattayavong P, Lim J, Li R, Sakai N, Panidi J, Hong MJ, Ma C, Wei N, Wehbe N, Fei Z, Heeney M, Labram JG, Anthopoulos TD, Snaith HJet al., 2020, Deciphering photocarrier dynamics for tuneable high-performance perovskite-organic semiconductor heterojunction phototransistors (vol 10, 4475, 2019), NATURE COMMUNICATIONS, Vol: 11, ISSN: 2041-1723

Journal article

Hodsden T, Thorley KJ, Panidi J, Basu A, Marsh AV, Dai H, White AJP, Wang C, Mitchell W, Glöcklhofer F, Anthopoulos TD, Heeney Met al., 2020, Core fluorination enhances solubility and ambient stability of an IDT‐based n‐type semiconductor in transistor devices, Advanced Functional Materials, Vol: 30, Pages: 1-12, ISSN: 1616-301X

The synthesis of a novel fluorinated n‐type small molecule based on an indacenodithiophene core is reported. Fluorination is found to have a significant impact on the physical properties, including a surprisingly dramatic improvement in solubility, in addition to effectively stabilizing the lowest‐unoccupied molecular orbital energy (−4.24 eV). Single‐crystal analysis and density functional theory calculations indicate the improved solubility can be attributed to backbone torsion resulting from the positioning of the fluorine group in close proximity to the strongly electron‐withdrawing dicyanomethylene group. Organic thin‐film transistors made via blade coating display high electron mobility (up to 0.49 cm2 V−1 s−1) along with good retention of performance in ambient conditions.

Journal article

He Q, Shahid M, Jiao X, Gann E, Eisner F, Wu T, Fei Z, Anthopoulos TD, McNeill CR, Heeney MJet al., 2020, The crucial role of fluorine in fully alkylated ladder type carbazole based non-fullerene organic solar cells, ACS Applied Materials and Interfaces, Vol: 12, Pages: 9555-9562, ISSN: 1944-8244

Two fused ladder type non-fullerene acceptors, DTCCIC and DTCCIC-4F, based on an electron-donating alkylated dithienocyclopentacarbazole core flanked by electron-withdrawing non-fluorinated or fluorinated 1,1-dicyanomethylene-3-indanone (IC or IC-4F), are prepared and utilized in organic solar cells (OSCs). The two new molecules reveal planar structures and strong aggregation behavior, and fluorination is shown to red shift the optical band gap and down shift energy levels. OSCs based on DTCCIC-4F exhibit a power conversion efficiency of 12.6 %, much higher than that of DTCCIC based devices (6.2 %). Microstructural studies reveal that while both acceptors are highly crystalline, bulk heterojunction blends based on the non-fluorinated DTCCIC result in overly coarse domains, while blends based on the fluorinated DTCCIC-4F exhibit a more optimal nanoscale morphology. These results highlight the importance of end group fluorination in controlling molecular aggregation and miscibility.

Journal article

Firdaus Y, He Q, Lin Y, Nugroho FAA, Le Corre VM, Yengel E, Balawi AH, Seitkhan A, Laquai F, Langhammer C, Liu F, Heeney M, Anthopoulos TDet al., 2020, Novel wide-bandgap non-fullerene acceptors for efficient tandem organic solar cells, 10th International Conference on Materials for Advanced Technologies (ICMAT) / Symposium P on Advanced Inorganic Materials and Thin Film Technology for Solar Energy Harvesting and Electronic Application, Publisher: ROYAL SOC CHEMISTRY, Pages: 1164-1175, ISSN: 2050-7488

Conference paper

Leventis A, Chmovzh TN, Knyazeva EA, Han Y, Heeney M, Rakitin OA, Bronstein Het al., 2020, A novel low-bandgap pyridazine thiadiazole-based conjugated polymer with deep molecular orbital levels, POLYMER CHEMISTRY, Vol: 11, Pages: 581-585, ISSN: 1759-9954

Journal article

Chaudhry MU, Panidi J, Nam S, Smith A, Lim J, Tetzner K, Patsalas PA, Vourlias G, Sit W-Y, Firdaus Y, Heeney M, Bradley DDC, Anthopoulos TDet al., 2019, Polymer Light-Emitting Transistors With Charge-Carrier Mobilities Exceeding 1 cm(2) V-1 s(-1), ADVANCED ELECTRONIC MATERIALS, Vol: 6, ISSN: 2199-160X

Journal article

Wu J, Luke J, Lee HKH, Tuladhar PS, Cha H, Jang S-Y, Tsoi WC, Heeney M, Kang H, Lee K, Kirchartz T, Kim J-S, Durrant JRet al., 2019, Tail state limited photocurrent collection of thick photoactive layers in organic solar cells, Nature Communications, Vol: 10, ISSN: 2041-1723

Weanalyseorganic solar cells with four differentphotoactive blends exhibiting differing dependencies ofshort-circuit current upon photoactive layer thickness.These blends and devices are analysedbytransient optoelectronic techniques ofcarrier kinetics and densities, airphotoemission spectroscopyof material energetics, Kelvin probe measurements of work function, Mott-Schottky analyses of apparent doping density and by device modelling. We concludethat,for the device series studied, the photocurrent losswith thick active layersis primarilyassociatedwith the accumulation of photo-generated charge carriers in intra-bandgap tail states.This charge accumulation screens the device internal electricalfield, preventing efficient charge collection. Purification of one studied donor polymer is observed to reduce tail statedistribution anddensity and increase the maximal photoactive thickness forefficient operation. Ourwork suggests that selectingorganic photoactive layerswith a narrow distribution of tail states isa keyrequirement for the fabrication of efficient, high photocurrent, thick organic solar cells.

Journal article

Lami V, Weu A, Zhang J, Chen Y, Fei Z, Heeney M, Friend RH, Vaynzof Yet al., 2019, Visualizing the Vertical Energetic Landscape in Organic Photovoltaics, JOULE, Vol: 3, Pages: 2513-2534, ISSN: 2542-4351

Journal article

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