THE UNIVERSITY of LIVERPOOL
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THE UNIVERSITY of LIVERPOOL Carbon Based Electronics: A National Consortium GRANT REF: GR/R97092/01 Coordination: Prof Bill Eccleston, Prof Alison Mainwood, Prof Bill Milne 01/10/2002 – 31/11/2006 Consortium Objective To co-ordinate UK research on carbon-based electronics and the material properties that are required to produce them, in order to enhance the international position that UK companies and research institutions already hold in this field by: i. developing novel, existing growth processing techniques and materials in order to design, produce and test improved devices. ii. introducing novel combinations of carbon- based materials and processing techniques, in order to devise innovation electronic devices. iii. training of scientists, engineers and students in the wide-ranging technologies required to exploit the research in the form of commercial devices in the UK. The project has produced an improved understanding of conduction processes in these materials and their impact on a wide range of devices and potential circuits. It has been able to look at new materials and their processing. Many of the collaborations continue and up to 50 people have benefited from laboratory based experience as well as the workshops. Publications to date: 128+ Com parison betw een electron and hole m obilities • E lectron and hole mobilitiesin polym ersem iconductors are ofcom parable m agnitude ! Polyfluorenes F8 1 ·10-2 cm 2/Vs 3 ·10-4 cm 2/Vs F8T2 6 ·10-3 cm 2/Vs 5 ·10-3 cm 2/Vs F8BT 4 ·10-3 cm 2/Vs - PPVs MEH-PPV 3 ·10-5 cm 2/Vs 5 ·10-5 cm 2/Vs OC1C10-PPV 3 ·10-3 cm2/Vs 5 ·10-4 cm 2/Vs CN-PPV 4 ·10-5 cm 2/Vs - Polythiophenes P3HT 2 ·10-4 cm2/Vs 6 ·10-4 cm 2/Vs Electron M obility Hole Mobility L.L.Chua, et al.,Nature 434,194 (2005) Achievements This table (left) shows the Meyer Neldel energies found experimentally using different polymer devices. Disciplines Engineering Chemistry Electronics Physics University Collaboration Examples of Thin Film transistors (Cambridge Eng) with nanotubes. Such structures have the capacity to exceed the carrier mobilities of silicon. Electron conduction in polymer TFT channels was thought unlikely. The values shown in this table (right) demonstrate that this is an extrinsic effect. CMOS is now possible. An EELS study (Surrey) of MWNT coated with WS2 (Sussex) shows for the first time that 4 monolayers are the lower limit to bulk dielectric behaviour. C B E Cambridge, Chemistry Cambridge, Physics: TFT physics and data Liverpool, Chemistry: TFT material (P3HT) Heriot-Watt, Bristol Chemistry: Deposition of Diamond Liverpool, Elec.Eng: Devices and circuit models KCL, Warwick Physics: EPR, diamond and C60 UCL, Elec. Eng., Physics: DTLS & theory, diamond Oxford, Chemistry: Diamond Substrates Cambridge,Eng: Nanotube TFT & composites Imperial, Physics & Chemistry: Polymers and materials Bangor: Polymer field effect devices/materials Surrey, Electronics: Multiple nanotubes Sussex, Chemistry: nanotube synthesis
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THE UNIVERSITY of LIVERPOOL. Cambridge, Physics: TFT physics and data. Cambridge, Chemistry. Liverpool, Chemistry: TFT material (P3HT). Heriot-Watt, Bristol Chemistry: Deposition of Diamond. Liverpool, Elec.Eng: Devices and circuit models. KCL, Warwick Physics: EPR, diamond and C60. - PowerPoint PPT Presentation
Transcript of THE UNIVERSITY of LIVERPOOL
THE UNIVERSITYof LIVERPOOL
Carbon Based Electronics: A National ConsortiumGRANT REF: GR/R97092/01Coordination: Prof Bill Eccleston, Prof Alison Mainwood, Prof Bill Milne01/10/2002 – 31/11/2006
Consortium Objective
To co-ordinate UK research on carbon-based electronicsand the material properties that are required to producethem, in order to enhance the international position thatUK companies and research institutions already hold inthis field by:
i. developing novel, existing growth processing techniques and materials in order to design, produce and test improved devices.
ii. introducing novel combinations of carbon-based materials and processing techniques, in order to devise innovation electronic devices.
iii. training of scientists, engineers and students in the wide-ranging technologies required to exploit the research in the form of commercial devices in the UK.
The project has produced an improved understanding of conduction processes in these materials and their impact on a wide range of devices and potential circuits. It has been able to look at new materials and their processing. Many of the collaborations continue and up to 50 people have benefited from laboratory based experience as well as the workshops.Publications to date: 128+
Comparison between electron and hole mobilities
• Electron and hole mobilities in polymer semiconductors are of comparable magnitude !
Polyfluorenes F8 1 · 10-2 cm2/Vs 3 · 10-4 cm2/Vs
F8T2 6 · 10-3 cm2/Vs 5 · 10-3 cm2/Vs
F8BT 4 · 10-3 cm2/Vs -
PPVs MEH-PPV 3 · 10-5 cm2/Vs 5 · 10-5 cm2/Vs
OC1C10-PPV 3 · 10-3 cm2/Vs 5 · 10-4 cm2/Vs
CN-PPV 4 · 10-5 cm2/Vs -
Polythiophenes P3HT 2 · 10-4 cm2/Vs 6 · 10-4 cm2/Vs
Electron Mobility Hole Mobility
L.L. Chua, et al., Nature 434, 194 (2005)
Achievements
This table (left) shows the Meyer Neldel energies found experimentally using different polymer devices.
DisciplinesEngineering Chemistry
Electronics Physics
University Collaboration
Examples of Thin Film transistors (Cambridge Eng) with nanotubes. Such structures have the capacity to exceed the carrier mobilities of silicon.
Electron conduction in polymer TFT channels was thought unlikely. The values shown in this table (right) demonstrate that this is an extrinsic effect. CMOS is now possible.
An EELS study (Surrey) of MWNT coated with WS2 (Sussex) shows for the first time that 4 monolayers are the lower limit to bulk dielectric behaviour.
C B
E
Cambridge, Chemistry
Cambridge, Physics: TFT physics and data
Liverpool, Chemistry: TFT material (P3HT)
Heriot-Watt, BristolChemistry: Deposition of Diamond
Liverpool, Elec.Eng: Devices and circuit models
KCL, WarwickPhysics: EPR, diamond and C60
UCL, Elec. Eng., Physics: DTLS & theory, diamond
Oxford, Chemistry: Diamond Substrates
Cambridge,Eng: Nanotube TFT & composites
Imperial, Physics & Chemistry: Polymers and materials
Bangor: Polymer field effect devices/materials
Surrey, Electronics: Multiple nanotubesSussex, Chemistry:
nanotube synthesis
