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

 

133ChemistrySouth Kensington Campus

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Summary

 

Publications

Publication Type
Year
to

266 results found

Fei Z, Eisner FD, Jiao X, Azzouzi M, Röhr JA, Han Y, Shahid M, Chesman ASR, Easton CD, McNeill CR, Anthopoulos TD, Nelson J, Heeney Met 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., Adv Mater

A new synthetic route, to prepare an alkylated indacenodithieno[3,2-b]thiophene-based nonfullerene acceptor (C8-ITIC), is reported. Compared to the reported ITIC with phenylalkyl side chains, the new acceptor C8-ITIC exhibits a reduction in the optical band gap, higher absorptivity, and an increased propensity to crystallize. Accordingly, blends with the donor polymer PBDB-T exhibit a power conversion efficiency (PCE) up to 12.4%. Further improvements in efficiency are found upon backbone fluorination of the donor polymer to afford the novel material PFBDB-T. The resulting blend with C8-ITIC shows an impressive PCE up to 13.2% as a result of the higher open-circuit voltage. Electroluminescence studies demonstrate that backbone fluorination reduces the energy loss of the blends, with PFBDB-T/C8-ITIC-based cells exhibiting a small energy loss of 0.6 eV combined with a high JSC of 19.6 mA cm-2 .

JOURNAL ARTICLE

Boufflet P, Bovo G, Occhi L, Yuan HK, Fei Z, Han Y, Anthopoulos TD, Stavrinou PN, Heeney Met al., 2017, The Influence of Backbone Fluorination on the Dielectric Constant of Conjugated Polythiophenes, Advanced Electronic Materials

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. The ability to modify or enhance the dielectric constant of semiconducting polymers can prove valuable for a range of optoelectronic and microelectronic applications. In the case of organic photovoltaics, increasing the dielectric constant of the active layer has often been suggested as a method to control charge generation, recombination dynamics, and ultimately, the power conversion efficiencies. In this contribution, the impact that the degree and pattern of fluorination has on the dielectric constant of poly(3-octylthiophene) (P3OT), a more soluble analogue of the widely studied conjugated material poly(3-hexylthiophene), is explored. P3OT and its backbone-fluorinated analogue, F-P3OT, are compared along with a block and alternating copolymer version of these materials. It is found that the dielectric constant of the polymer thin films increases as the degree of backbone fluorination increases, in a trend consistent with density functional theory calculations of the dipole moment.

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Boufflet P, Casey A, Xia Y, Stavrinou PN, Heeney Met al., 2017, Pentafluorobenzene end-group as a versatile handle for para fluoro "click" functionalization of polythiophenes, CHEMICAL SCIENCE, Vol: 8, Pages: 2215-2225, ISSN: 2041-6520

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Casey A, Green JP, Tuladhar PS, Kirkus M, Han Y, Anthopoulos TD, Heeney Met al., 2017, Cyano substituted benzotriazole based polymers for use in organic solar cells, JOURNAL OF MATERIALS CHEMISTRY A, Vol: 5, Pages: 6465-6470, ISSN: 2050-7488

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Costa L, Al-Hashimi M, Heeney M, Terekhov A, Rajput D, Hofmeister W, Verma Aet al., 2017, Template-Synthesis of Conjugated Poly(3-Hexylselenophene) (P3HS) Nanofibers Using Femtosecond Laser Machined Fused Silica Templates, MRS ADVANCES, Vol: 2, Pages: 2957-2960, ISSN: 2059-8521

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Creamer A, Casey A, Marsh AV, Shahid M, Gao M, Heeney Met al., 2017, Systematic Tuning of 2,1,3-Benzothiadiazole Acceptor Strength by Monofunctionalization with Alkylamine, Thioalkyl, or Alkoxy Groups in Carbazole Donor-Acceptor Polymers, MACROMOLECULES, Vol: 50, Pages: 2736-2746, ISSN: 0024-9297

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Datko BD, Thomas AK, Fei Z, Heeney M, Grey JKet 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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Fei Z, Chen L, Han Y, Gann E, Chesman ASR, McNeill CR, Anthopoulos TD, Heeney M, Pietrangelo Aet 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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Fei Z, Han Y, Gann E, Hodsden T, Chesman ASR, McNeill CR, Anthopoulos TD, Heeney Met 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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Green JP, Cryer SJ, Marafie J, White AJP, Heeney Met 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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Hu Z, Haws RT, Fei Z, Boufflet P, Heeney M, Rossky PJ, Vanden Bout DAet 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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Patra D, Lee J, Lee J, Sredojevic DN, White AJP, Bazzi HS, Brothers EN, Heeney M, Fang L, Yoon M-H, Al-Hashimi Met al., 2017, Synthesis of low band gap polymers based on pyrrolo[3,2-d:4,5-d ']bisthiazole (PBTz) and thienylenevinylene (TV) for organic thin-film transistors (OTFTs), JOURNAL OF MATERIALS CHEMISTRY C, Vol: 5, Pages: 2247-2258, ISSN: 2050-7526

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Rodriquez D, Kim J-H, Root SE, Fe Z, Boufflet P, Heeney M, Kim T-S, Lipomi DJet al., 2017, Comparison of Methods for Determining the Mechanical Properties of Semiconducting Polymer Films for Stretchable Electronics, ACS APPLIED MATERIALS & INTERFACES, Vol: 9, Pages: 8855-8862, ISSN: 1944-8244

JOURNAL ARTICLE

Taroni PJ, Santagiuliana G, Wan K, Calado P, Qiu M, Zhang H, Pugno NM, Palma M, Stingelin-Stutzman N, Heeney M, Fenwick O, Baxendale M, Bilotti Eet al., 2017, Toward Stretchable Self-Powered Sensors Based on the Thermoelectric Response of PEDOT:PSS/Polyurethane Blends, Advanced Functional Materials, ISSN: 1616-301X

© 2017 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. The development of new flexible and stretchable sensors addresses the demands of upcoming application fields like internet-of-things, soft robotics, and health/structure monitoring. However, finding a reliable and robust power source to operate these devices, particularly in off-the-grid, maintenance-free applications, still poses a great challenge. The exploitation of ubiquitous temperature gradients, as the source of energy, can become a practical solution, since the recent discovery of the outstanding thermoelectric properties of a conductive polymer, poly(3,4-ethylenedioxythiophene)-poly(styrenesulfonate) (PEDOT:PSS). Unfortunately the use of PEDOT:PSS is currently constrained by its brittleness and limited processability. Herein, PEDOT:PSS is blended with a commercial elastomeric polyurethane (Lycra), to obtain tough and processable self-standing films. A remarkable strain-at-break of ≈700% is achieved for blends with 90 wt% Lycra, after ethylene glycol treatment, without affecting the Seebeck voltage. For the first time the viability of these novel blends as stretchable self-powered sensors is demonstrated.

JOURNAL ARTICLE

Wade J, Wood S, Collado-Fregoso E, Heeney M, Durrant J, Kim J-Set 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

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Wijeyasinghe N, Regoutz A, Eisner F, Du T, Tsetseris L, Lin Y-H, Faber H, Pattanasattayavong P, Li J, Yan F, McLachlan MA, Payne DJ, Heeney M, Anthopoulos TDet 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

JOURNAL ARTICLE

Al-Hashimi M, Han Y, Smith J, Bazzi HS, Alqaradawi SYA, Watkins SE, Anthopoulos TD, Heeney Met al., 2016, Influence of the heteroatom on the optoelectronic properties and transistor performance of soluble thiophene-, selenophene- and tellurophene-vinylene copolymers, CHEMICAL SCIENCE, Vol: 7, Pages: 1093-1099, ISSN: 2041-6520

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Bannock JE, Xu W, Baissas T, Heeney M, de Mello JCet al., 2016, Rapid flow-based synthesis of poly(3-hexylthiophene) using 2-methyltetrahydrofuran as a bio-derived reaction solvent, EUROPEAN POLYMER JOURNAL, Vol: 80, Pages: 240-246, ISSN: 0014-3057

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Bannock JH, Treat ND, Chabinyc M, Stingelin N, Heeney M, de Mello JCet al., 2016, The influence of polymer purification on the efficiency of poly(3-hexylthiophene):fullerene organic solar cells, SCIENTIFIC REPORTS, Vol: 6, ISSN: 2045-2322

JOURNAL ARTICLE

Boufflet P, Wood S, Wade J, Fei Z, Kim J-S, Heeney Met al., 2016, Comparing blends and blocks: Synthesis of partially fluorinated diblock polythiophene copolymers to investigate the thermal stability of optical and morphological properties, BEILSTEIN JOURNAL OF ORGANIC CHEMISTRY, Vol: 12, Pages: 2150-+, ISSN: 1860-5397

JOURNAL ARTICLE

Cachelin P, Green JP, Peijs T, Heeney M, Bastiaansen CWMet al., 2016, Optical Acetone Vapor Sensors Based on Chiral Nematic Liquid Crystals and Reactive Chiral Dopants, ADVANCED OPTICAL MATERIALS, Vol: 4, Pages: 592-596, ISSN: 2195-1071

JOURNAL ARTICLE

Casey A, Dimitrov SD, Shakya-Tuladhar P, Fei Z, Malgorzata N, Han Y, Anthopoulos TD, Durrant JR, Heeney Met al., 2016, Effect of Systematically Tuning Conjugated Donor Polymer Lowest Unoccupied Molecular Orbital Levels via Cyano Substitution on Organic Photovoltaic Device Performance, CHEMISTRY OF MATERIALS, Vol: 28, Pages: 5110-5120, ISSN: 0897-4756

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Casey A, Han Y, Gann E, Green JP, McNeill CR, Anthopoulos TD, Heeney Met al., 2016, Vinylene-Linked Oligothiophene-Difluorobenzothiadiazole Copolymer for Transistor Applications, ACS APPLIED MATERIALS & INTERFACES, Vol: 8, Pages: 31154-31165, ISSN: 1944-8244

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Dimitrov SD, Schroeder BC, Nielsen CB, Bronstein H, Fei Z, McCulloch I, Heeney M, Durrant JRet al., 2016, Singlet Exciton Lifetimes in Conjugated Polymer Films for Organic Solar Cells, POLYMERS, Vol: 8, ISSN: 2073-4360

JOURNAL ARTICLE

Fei Z, Han Y, Martin J, Scholes FH, Al-Hashimi M, AlQaradawi SY, Stingelin N, Anthopoulos TD, Heeney Met al., 2016, Conjugated Copolymers of Vinylene Flanked Naphthalene Diimide, MACROMOLECULES, Vol: 49, Pages: 6384-6393, ISSN: 0024-9297

JOURNAL ARTICLE

Green JP, Han Y, Kilmurray R, McLachlan MA, Anthopoulos TD, Heeney Met al., 2016, An Air-Stable Semiconducting Polymer Containing Dithieno[3,2-b:2 ',3 '-d]arsole, ANGEWANDTE CHEMIE-INTERNATIONAL EDITION, Vol: 55, Pages: 7148-7151, ISSN: 1433-7851

JOURNAL ARTICLE

Green JP, Han Y, Kilmurray R, McLachlan MA, Anthopoulos TD, Heeney Met al., 2016, An Air-Stable Semiconducting Polymer Containing Dithieno[3,2- b :2′,3′- d ]arsole, Angewandte Chemie, Vol: 128, Pages: 7264-7267, ISSN: 0044-8249

JOURNAL ARTICLE

Han Y, Barnes G, Lin Y-H, Martin J, Al-Hashimi M, AlQaradawi SY, Anthopoulos TD, Heeney Met al., 2016, Doping of Large Ionization Potential Indenopyrazine Polymers via Lewis Acid Complexation with Tris(pentafluorophenyl)borane: A Simple Method for Improving the Performance of Organic Thin-Film Transistors, CHEMISTRY OF MATERIALS, Vol: 28, Pages: 8016-8024, ISSN: 0897-4756

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Isakov I, Paterson AF, Solomeshch O, Tessler N, Zhang Q, Li J, Zhang X, Fei Z, Heeney M, Anthopoulos TDet al., 2016, Hybrid complementary circuits based on p-channel organic and n-channel metal oxide transistors with balanced carrier mobilities of up to 10 cm(2)/Vs, APPLIED PHYSICS LETTERS, Vol: 109, ISSN: 0003-6951

JOURNAL ARTICLE

Kang K, Watanabe S, Broch K, Sepe A, Brown A, Nasrallah I, Nikolka M, Fei Z, Heeney M, Matsumoto D, Marumoto K, Tanaka H, Kuroda S-I, Sirringhaus Het al., 2016, 2D coherent charge transport in highly ordered conducting polymers doped by solid state diffusion, NATURE MATERIALS, Vol: 15, Pages: 896-+, ISSN: 1476-1122

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