Publications
421 results found
Kao CY, Lee B, Wielunski LS, et 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.
Jimison LH, Toney MF, McCulloch I, et 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
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- Citations: 297
Mayer AC, Toney MF, Scully SR, et 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
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- Citations: 372
Bjorklund N, Lill J-O, Rajander J, et 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
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- Citations: 7
DeLongchamp DM, Kline RJ, Jung Y, et al., 2009, Controlling the Orientation of Terraced Nanoscale "Ribbons" of a Poly(thiophene) Semiconductor, ACS NANO, Vol: 3, Pages: 780-787, ISSN: 1936-0851
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- Citations: 157
Brocorens P, Van Vooren A, Chabinyc ML, et al., 2009, Solid-State Supramolecular Organization of Polythiophene Chains Containing Thienothiophene Units, ADVANCED MATERIALS, Vol: 21, Pages: 1193-1198, ISSN: 0935-9648
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- Citations: 71
McCulloch I, Heeney M, Chabinyc ML, et 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
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- Citations: 376
Hamilton R, Smith J, Ogier S, et al., 2009, High-Performance Polymer-Small Molecule Blend Organic Transistors, ADVANCED MATERIALS, Vol: 21, Pages: 1166-1171, ISSN: 0935-9648
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- Citations: 329
Hamilton R, Heeney M, Anthopoulos T, et 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
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 longer lifetimes as their operational times are reduce
Barard S, Heeney M, Chen L, et 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
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- Citations: 29
McCulloch I, Heeney M, 2009, Flexible Electronics Materials and Applications, Publisher: Springer, ISBN: 978-0-387-74362-2
Heeney M, McCulloch I, 2009, Semiconducting Polythiophenes for Field-Effect Transistor Devices in Flexible Electronics: Synthesis and Structure Property Relationships, FLEXIBLE ELECTRONICS: MATERIALS AND APPLICATIONS, Editors: Wong, Salleo, Publisher: SPRINGER, Pages: 261-296, ISBN: 978-0-387-74362-2
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- Citations: 4
Shoaee S, An Z, Zhang X, et al., 2009, Charge photogeneration in polythiophene-perylene diimide blend films, CHEMICAL COMMUNICATIONS, Pages: 5445-5447, ISSN: 1359-7345
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- Citations: 61
Smith J, Hamilton R, Heeney M, et al., 2008, High-performance organic integrated circuits based on solution processable polymer-small molecule blends, APPLIED PHYSICS LETTERS, Vol: 93, ISSN: 0003-6951
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- Citations: 68
Crouch DJ, Skabara PJ, Heeney M, et 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
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- Citations: 22
Mannsfeld SCB, Sharei A, Liu S, et al., 2008, Highly Efficient Patterning of Organic Single-Crystal Transistors from the Solution Phase, ADVANCED MATERIALS, Vol: 20, Pages: 4044-+, ISSN: 0935-9648
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- Citations: 97
Grzegorczyk WJ, Savenije TJ, Heeney M, et 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
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- Citations: 18
Northrup JE, Chabinyc ML, Hamilton R, et al., 2008, Theoretical and experimental investigations of a polyalkylated-thieno[3,2-<i>b</i>]thiophene semiconductor, JOURNAL OF APPLIED PHYSICS, Vol: 104, ISSN: 0021-8979
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- Citations: 9
Ballantyne AM, Chen L, Dane J, et 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
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- Citations: 239
Li FM, Dhagat P, Haverinen HM, et al., 2008, Polymer thin film transistor without surface pretreatment on silicon nitride gate dielectric, APPLIED PHYSICS LETTERS, Vol: 93, ISSN: 0003-6951
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- Citations: 6
DeLongchamp DM, Kline RJ, Jung Y, et al., 2008, Molecular basis of mesophase ordering in a thiophene-based copolymer, MACROMOLECULES, Vol: 41, Pages: 5709-5715, ISSN: 0024-9297
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- Citations: 104
Anthony JE, Heeney M, Ong BS, 2008, Synthetic aspects of organic semiconductors, MRS BULLETIN, Vol: 33, Pages: 698-705, ISSN: 0883-7694
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- Citations: 33
Hwang I-W, Kim JY, Cho S, et al., 2008, Bulk heterojunction materials composed of poly(2,5-bis(3-tetradecylthiophen-2-yl)thieno[3,2-<i>b</i>]thiophene):: Ultrafast electron transfer and carrier recombination, JOURNAL OF PHYSICAL CHEMISTRY C, Vol: 112, Pages: 7853-7857, ISSN: 1932-7447
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- Citations: 45
Moad AJ, DeLongchamp DM, Kline RJ, et 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
Parmer JE, Mayer AC, Hardin BE, et al., 2008, Organic bulk heterojunction solar cells using poly(2,5-bis(3-tetradecyllthiophen-2-yl)thieno[3,2,-<i>b</i>]thiophene), APPLIED PHYSICS LETTERS, Vol: 92, ISSN: 0003-6951
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- Citations: 102
Ohkita H, Cook S, Astuti Y, et 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
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- Citations: 574
Jung Y, Kline RJ, Fischer DA, et 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
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- Citations: 118
Rawcliffe R, Shkunov M, Heeney M, et 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.
Ishwara T, Bradley DDC, Nelson J, et al., 2008, Influence of polymer ionization potential on the open-circuit voltage of hybrid polymer/TiO<sub>2</sub> solar cells, APPLIED PHYSICS LETTERS, Vol: 92, ISSN: 0003-6951
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- Citations: 40
McCulloch I, Coelle M, Genevicius K, et al., 2008, Electrical properties of reactive liquid crystal semiconductors, International Symposium on Organic and Inorganic Electronic Materials and Related Nanotechnologies, Publisher: JAPAN SOC APPLIED PHYSICS, Pages: 488-491, ISSN: 0021-4922
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- Citations: 14
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