Non-equilibrium and relaxation phenomena in graphene-based devices
Lead Research Organisation:
UNIVERSITY OF EXETER
Department Name: Physics
Abstract
Graphene (a single atomic layer of graphite) first experimentally isolated and identified only four years ago, is rapidly revealing its great potential as an important material for future electronic devices. In order to progress towards realistic device applications of graphene, it is important to address the issues which will affect the operation of graphene in real circuits, where high currents will lead to overheating and non-equilibrium charge carrier distributions. The proposed joint project will launch an internationally leading programme involving three research groups which are already well established in graphene research and have expertise in complimentary areas. By combining fabrication technology of graphene-based devices, transport and optical studies, and theoretical modelling, we will investigate the kinetic properties of charge carriers and phonons (lattice vibrations) in graphene over a broad range of operating voltages, temperatures and optical intensities, with the aim to establish and improve the operating characteristics of graphene-based electronic and optoelectronic devices.
People |
ORCID iD |
Euan Hendry (Principal Investigator) | |
Alexander Savchenko (Researcher) |
Publications
Kaverzin A
(2010)
Electrochemical doping of graphene
Tollerton CJ
(2019)
Origins of All-Optical Generation of Plasmons in Graphene.
in Scientific reports
Tomadin A
(2018)
The ultrafast dynamics and conductivity of photoexcited graphene at different Fermi energies.
in Science advances
Ulbricht R
(2017)
Erratum: Carrier dynamics in semiconductors studied with time-resolved terahertz spectroscopy [Rev. Mod. Phys. 83 , 543 (2011)]
in Reviews of Modern Physics
Hendry E
(2010)
Coherent nonlinear optical response of graphene.
in Physical review letters
Price A
(2012)
Nonlinear resistivity and heat dissipation in monolayer graphene
in Physical Review B
Kaverzin A
(2012)
Impurities as a source of 1 / f noise in graphene
in Physical Review B
Description | We found that graphene is remarkably robust to very high electronic temperatures, a property which is enabled by extremely efficient energy relaxation mechanisms. This has enabled the development of high current graphene devices within our own group and others. In contrast, we have also found that the transport and optical properties of graphene are rincreadibly sensitive to environment - we have obtained further funded to investigate this property further, with a view to developing chemical sensors. |
Exploitation Route | Arguably our most important finding during this project lies in graphene's exceptionally high optical nonlinearity under intense illumination. This has led to a spate of theoretical studies which have shown that, due to this exceptional property, single photon nonlinearities may be possible in graphene. There is now a strong push amongst the graphene community to demonstrate this effect, and this is something we ourselves are aiming to achieve as part our ERC funded FET network, GRASP. |
Sectors | Electronics,Pharmaceuticals and Medical Biotechnology |
URL | http://www.grasp-fet.eu/ |
Description | By combining manufacturing technology of graphene-based devices, transport and optical studies, we elucidated the kinetic properties of charge carriers and phonons in graphene over a broad range of operating voltages, temperatures and optical intensities. This knowledge is essential for graphene devices operating in real circuits, where high currents will lead to overheating and non-equilibrium charge carrier distributions. Probably our most important finding during this project lies in graphene's exceptionally high optical nonlinearity under intense illumination. This has led to the initiation of an ERC funded FET network, GRASP, aimed at pushing the optical nonlinearity to the single photon limit. |
First Year Of Impact | 2010 |
Sector | Electronics |
Description | FP7 FET grant |
Amount | € 395,000 (EUR) |
Organisation | European Research Council (ERC) |
Sector | Public |
Country | Belgium |
Start | 01/2014 |
End | 01/2017 |
Description | Royal Society of London |
Amount | £14,000 (GBP) |
Funding ID | Royal Society research grant (RG110585) |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 01/2012 |
End | 01/2015 |
Description | Royal Society of London |
Amount | £14,000 (GBP) |
Funding ID | Royal Society research grant (RG110585) |
Organisation | The Royal Society |
Sector | Charity/Non Profit |
Country | United Kingdom |
Start | 01/2012 |
End | 01/2015 |
Description | University of Exeter |
Amount | £10,000 (GBP) |
Funding ID | Knowledge Escalator - Proof of Concept Award |
Organisation | University of Exeter |
Sector | Academic/University |
Country | United Kingdom |
Start | 01/2010 |
End | 01/2013 |
Description | University of Exeter |
Amount | £1,000 (GBP) |
Funding ID | Exeter Open Innovation Platform Link Fund |
Organisation | University of Exeter |
Sector | Academic/University |
Country | United Kingdom |
Start | 01/2012 |
End | 01/2012 |