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

300 results found

Heeney M, McCulloch I, 2009, Handbook of Thiophene-Based Materials: Applications in Organic Electronics and Photonics. Chapter 17 Thienothiophene-containing polymers for field effect transistor applications, Publisher: Wiley, ISBN: 978-0-470-05732-2

Book

Kao CY, Lee B, Wielunski LS, Heeney M, McCulloch I, Garfunkel E, Feldman LC, Podzorov Vet al., 2009, Doping of Conjugated Polythiophenes with Alkyl Silanes, ADV FUNCT MATER, Vol: 19, Pages: 1906-1911, ISSN: 1616-301X

A strong modification of the electronic properties of solution-processable conjugated polythiophenes by self-assembled silane molecules is reported. Upon bulk doping with hydrolized fluoroalkyl trichlorosilane, the electrical conductivity of ultrathin polythiophene films increases by upon to six orders of cm(-1) for poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene) (PBTTT) and 50 +/- 20 S cm(-1) for poly(3-hexyl)thiophene (P3HT). Interband optical absorption of the polymers in the doped state is drastically reduced, making these highly conductive films transparent in the visible range. The dopants within the porous polymer matrix are partially crosslinked via a silane self-polymerization mechanism that makes the samples very stable in vacuum and nonpolar environments. The mechanism of SAM-induced conductivity is believed to be based on protonic doping by the free silanol groups available within the partially crosslinked SAM network incorporated in the polythiophene structure. The SAM-doped polythiophenes exhibit an intrinsic sensing effect: a drastic and reversible change in conductivity in response to ambient polar molecules, which is believed to be due to the interaction of the silanol groups with polar analytes. The reported electronic effects point to a new attractive route for doping conjugated polymers with potential applications in transparent conductors and molecular sensors.

Journal article

Jimison LH, Toney MF, McCulloch I, Heeney M, Salleo Aet al., 2009, Charge-Transport Anisotropy Due to Grain Boundaries in Directionally Crystallized Thin Films of Regioregular Poly(3-hexylthiophene), ADVANCED MATERIALS, Vol: 21, Pages: 1568-+, ISSN: 0935-9648

Journal article

Mayer AC, Toney MF, Scully SR, Rivnay J, Brabec CJ, Scharber M, Koppe M, Heeney M, McCulloch I, McGehee MDet al., 2009, Bimolecular Crystals of Fullerenes in Conjugated Polymers and the Implications of Molecular Mixing for Solar Cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 19, Pages: 1173-1179, ISSN: 1616-301X

Journal article

Bjorklund N, Lill J-O, Rajander J, Osterbacka R, Tierney S, Heeney M, McCulloch I, Coelle Met al., 2009, The effects of metal impurities in poly[(2,5-bis(3-decylthiophen-2-yl)thieno[2,3-b]thiophene] on field-effect transistor properties, ORGANIC ELECTRONICS, Vol: 10, Pages: 215-221, ISSN: 1566-1199

Journal article

DeLongchamp DM, Kline RJ, Jung Y, Germack DS, Lin EK, Moad AJ, Richter LJ, Toney MF, Heeney M, McCulloch Iet al., 2009, Controlling the Orientation of Terraced Nanoscale "Ribbons" of a Poly(thiophene) Semiconductor, ACS NANO, Vol: 3, Pages: 780-787, ISSN: 1936-0851

Journal article

Brocorens P, Van Vooren A, Chabinyc ML, Toney MF, Shkunov M, Heeney M, McCulloch I, Cornil J, Lazzoroni Ret al., 2009, Solid-State Supramolecular Organization of Polythiophene Chains Containing Thienothiophene Units, ADVANCED MATERIALS, Vol: 21, Pages: 1193-1198, ISSN: 0935-9648

Journal article

McCulloch I, Heeney M, Chabinyc ML, DeLongchamp D, Kline RJ, Coelle M, Duffy W, Fischer D, Gundlach D, Hamadani B, Hamilton R, Richter L, Salleo A, Shkunov M, Sporrowe D, Tierney S, Zhong Wet al., 2009, Semiconducting Thienothiophene Copolymers: Design, Synthesis, Morphology, and Performance in Thin-Film Organic Transistors, ADVANCED MATERIALS, Vol: 21, Pages: 1091-1109, ISSN: 0935-9648

Journal article

Hamilton R, Smith J, Ogier S, Heeney M, Anthony JE, McCulloch I, Veres J, Bradley DDC, Anthopoulos TDet al., 2009, High-Performance Polymer-Small Molecule Blend Organic Transistors, ADVANCED MATERIALS, Vol: 21, Pages: 1166-1171, ISSN: 0935-9648

Journal article

Shoaee S, An Z, Zhang X, Barlow S, Marder SR, Duffy W, Heeney M, McCulloch I, Durrant JRet al., 2009, Charge photogeneration in polythiophene-perylene diimide blend films, CHEMICAL COMMUNICATIONS, Pages: 5445-5447, ISSN: 1359-7345

Journal article

Barard S, Heeney M, Chen L, Colle M, Shkunov M, McCulloch I, Stingelin N, Philips M, Kreouzis Tet al., 2009, Separate charge transport pathways determined by the time of flight method in bimodal polytriarylamine, JOURNAL OF APPLIED PHYSICS, Vol: 105, ISSN: 0021-8979

Journal article

Hamilton R, Heeney M, Anthopoulos T, McCulloch Iet al., 2009, Development of polymer semiconductors for field-effect transistor devices in displays, Organic Electronics: Materials, Processing, Devices and Applications, Pages: 393-429, ISBN: 9781420072907

© 2010 by Taylor & Francis Group, LLC. The increasingly impressive electrical performance of organic semiconductors is driving the development of solution-based printing processes aimed at low cost fabrication of transistor devices. The most immediate application area will most likely be in active matrix displays, where transistors are used in the backplane circuitry, operating basically as an individual pixel switch. In liquid crystal displays (LCDs) and electrophoretic displays (EPDs), the transistor charges both the pixel and storage capacitor, whereas in an organic light-emitting diode display (OLED), the transistor delivers current to the diode element. Most medium and large size LCDs, i.e., monitor and television displays, employ amorphous silicon as the transistor semiconductor (high resolution displays often require polysilicon), with a charge carrier mobility of the order of 0.5 cm2/V s. The EPD effect can tolerate a lower performance from backplane transistors and is hence the most compatible with the performance limitations of organic transistors. As the EPD effect is reflective, the pixel transistor can occupy almost the full area underneath the pixel, in contrast to transmissive display effects such as LCD, where the opaque transistors block light from the backlight and therefore must be as small as possible (i.e., the pixel should have a high aperture ratio) to maximize the efficiency. This means that the EPD transistor width (W) is maximized and can deliver more current per pixel compensating for low mobility semiconductors. As a result, mobility specifications are in the region of 0.01 cm2/V s for a device with low refresh rates, low resolution, and small size. Another favorable aspect of the EPD effect is that once the pixel and storage capacitor is charged, no further power is required to retain the image, i.e., it is bistable. Thus the duty cycle load on the transistor is minimized, and subsequently the devices can potentially have long

Book chapter

McCulloch I, Heeney M, 2009, Flexible Electronics Materials and Applications, Publisher: Springer, ISBN: 978-0-387-74362-2

Book

Smith J, Hamilton R, Heeney M, de Leeuw DM, Cantatore E, Anthony JE, McCulloch I, Bradley DDC, Anthopoulos TDet al., 2008, High-performance organic integrated circuits based on solution processable polymer-small molecule blends, APPLIED PHYSICS LETTERS, Vol: 93, ISSN: 0003-6951

Journal article

Crouch DJ, Skabara PJ, Heeney M, McCulloch I, Sparrowe D, Coles SJ, Hursthouse MBet al., 2008, Hexyl-Substituted Oligoselenophenes with Central Tetrafluorophenylene Units: Synthesis, Characterisation and Application in Organic Field Effect Transistors, MACROMOLECULAR RAPID COMMUNICATIONS, Vol: 29, Pages: 1839-1843, ISSN: 1022-1336

Journal article

Mannsfeld SCB, Sharei A, Liu S, Roberts ME, McCulloch I, Heeney M, Bao Zet al., 2008, Highly Efficient Patterning of Organic Single-Crystal Transistors from the Solution Phase, ADVANCED MATERIALS, Vol: 20, Pages: 4044-+, ISSN: 0935-9648

Journal article

Grzegorczyk WJ, Savenije TJ, Heeney M, Tierney S, McCulloch I, van Bavel S, Siebbeles LDAet al., 2008, Relationship between Film Morphology, Optical, and Conductive Properties of Poly(thienothiophene): [6,6]-Phenyl C-61-Butyric Acid Methyl Ester Bulk Heterojunctions, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 112, Pages: 15973-15979, ISSN: 1932-7447

Journal article

Northrup JE, Chabinyc ML, Hamilton R, McCulloch I, Heeney Met al., 2008, Theoretical and experimental investigations of a polyalkylated-thieno[3,2-b]thiophene semiconductor, JOURNAL OF APPLIED PHYSICS, Vol: 104, ISSN: 0021-8979

Journal article

Ballantyne AM, Chen L, Dane J, Hammant T, Braun FM, Heeney M, Duffy W, McCulloch I, Bradley DDC, Nelson Jet al., 2008, The effect of poly(3-hexylthiophene) molecular weight on charge transport and the performance of polymer : fullerene solar cells, ADVANCED FUNCTIONAL MATERIALS, Vol: 18, Pages: 2373-2380, ISSN: 1616-301X

Journal article

Li FM, Dhagat P, Haverinen HM, McCulloch I, Heeney M, Jabbour GE, Nathan Aet al., 2008, Polymer thin film transistor without surface pretreatment on silicon nitride gate dielectric, APPLIED PHYSICS LETTERS, Vol: 93, ISSN: 0003-6951

Journal article

DeLongchamp DM, Kline RJ, Jung Y, Lin EK, Fischer DA, Gundlach DJ, Cotts SK, Moad AJ, Richter LJ, Toney MF, Heeney M, McCulloch Iet al., 2008, Molecular basis of mesophase ordering in a thiophene-based copolymer, MACROMOLECULES, Vol: 41, Pages: 5709-5715, ISSN: 0024-9297

Journal article

Anthony JE, Heeney M, Ong BS, 2008, Synthetic aspects of organic semiconductors, MRS BULLETIN, Vol: 33, Pages: 698-705, ISSN: 0883-7694

Journal article

Hwang I-W, Kim JY, Cho S, Yuen J, Coates N, Lee K, Heeney M, McCulloch I, Moses D, Heeger AJet al., 2008, Bulk heterojunction materials composed of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-b]thiophene): Ultrafast electron transfer and carrier recombination, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 112, Pages: 7853-7857, ISSN: 1932-7447

Journal article

Moad AJ, DeLongchamp DM, Kline RJ, Jung Y, Fischer DA, Gundlach DJ, Hamadani BH, McCulloch I, Heeney M, Richter LJet al., 2008, COLL 369-Molecular characterization of the thermal phase behavior of two high performance semiconducting polymers, ABSTRACTS OF PAPERS OF THE AMERICAN CHEMICAL SOCIETY, Vol: 235, ISSN: 0065-7727

Journal article

Parmer JE, Mayer AC, Hardin BE, Scully SR, McGehee MD, Heeney M, McCulloch Iet al., 2008, Organic bulk heterojunction solar cells using poly(2,5-bis(3-tetradecyllthiophen-2-yl)thieno[3,2,-b]thiophene), APPLIED PHYSICS LETTERS, Vol: 92, ISSN: 0003-6951

Journal article

Ohkita H, Cook S, Astuti Y, Duffy W, Tierney S, Zhang W, Heeney M, McCulloch I, Nelson J, Bradley DDC, Durrant JRet al., 2008, Charge carrier formation in polythiophene/fullerene blend films studied by transient absorption spectroscopy, JOURNAL OF THE AMERICAN CHEMICAL SOCIETY, Vol: 130, Pages: 3030-3042, ISSN: 0002-7863

Journal article

Jung Y, Kline RJ, Fischer DA, Lin EK, Heeney M, McCulloch I, DeLongchamp DMet al., 2008, The effect of interfacial roughness on the thin film morphology and charge transport of high-performance polythiophenes, ADVANCED FUNCTIONAL MATERIALS, Vol: 18, Pages: 742-750, ISSN: 1616-301X

Journal article

Rawcliffe R, Shkunov M, Heeney M, Tierney S, McCulloch I, Campbell Aet al., 2008, Organic field-effect transistors of poly(2,5-bis(3-dodecylthiophen-2-yl)- thieno[2,3-b]thiophene) deposited on five different silane self-assembled monolayers, Chemical Communications, Vol: 2008, Pages: 871-873

Depositing a fused-ring thieno-thiophene polymer on different self-assembled monolayers indicates that varying the SAM sur- face energy changes the FET mobility and turn-on voltage by varying polymer crystallinity at the buried interface.

Journal article

Ishwara T, Bradley DDC, Nelson J, Ravirajan P, Vanseveren I, Cleij T, Vanderzande D, Lutsen L, Tierney S, Heeney M, McCulloch Iet al., 2008, Influence of polymer ionization potential on the open-circuit voltage of hybrid polymer/TiO(2) solar cells, APPLIED PHYSICS LETTERS, Vol: 92, ISSN: 0003-6951

Journal article

Gather MC, Heeney M, Zhang W, Whitehead KS, Bradley DDC, McCulloch I, Campbell AJet al., 2008, An alignable fluorene thienothiophene copolymer with deep-blue electroluminescent emission at 410 nm, CHEMICAL COMMUNICATIONS, Pages: 1079-1081, ISSN: 1359-7345

Journal article

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