EPSRC-Royal Society fellowship engagement (2012): Tailoring the Electronic Properties of Semiconducting Transition Metal Dichalcogenides
Lead Research Organisation:
Imperial College London
Department Name: Materials
Abstract
Please refer to attached Royal Society application
Planned Impact
Please refer to attached Royal Society application
People |
ORCID iD |
| Cecilia Mattevi (Principal Investigator / Fellow) |
Publications
Zatko V
(2019)
Band-Structure Spin-Filtering in Vertical Spin Valves Based on Chemical Vapor Deposited WS2.
in ACS nano
Yamaguchi H
(2016)
Valence-band electronic structure evolution of graphene oxide upon thermal annealing for optoelectronics
in physica status solidi (a)
Wakamura T
(2019)
Spin-orbit interaction induced in graphene by transition metal dichalcogenides
in Physical Review B
Wakamura T
(2018)
Strong Anisotropic Spin-Orbit Interaction Induced in Graphene by Monolayer WS_{2}.
in Physical review letters
Sokolikova MS
(2019)
Direct solution-phase synthesis of 1T' WSe2 nanosheets.
in Nature communications
Sokolikova MS
(2017)
Room-temperature growth of colloidal Bi2Te3 nanosheets.
in Chemical communications (Cambridge, England)
Sherrell PC
(2018)
Thickness-Dependent Characterization of Chemically Exfoliated TiS2 Nanosheets.
in ACS omega
Sherrell P
(2016)
Mesoscale design of multifunctional 3D graphene networks
in Materials Today
Sherrell P
(2019)
Large-Area CVD MoS 2 /WS 2 Heterojunctions as a Photoelectrocatalyst for Salt-Water Oxidation
in ACS Applied Energy Materials
Reale F
(2017)
High-Mobility and High-Optical Quality Atomically Thin WS 2.
in Scientific reports
| Description | We have identify strategies to synthesize high quality transition metal dichalcogenides in atomically thin form. The novelty is in the high quality and extended size of the materials deposited onto a planar support (SiO2/Silicon). Up until now the synthesis of this materials have been limited to smaller size samples. To achieve this goal, we have gained significant insights on the chemical mechanism behind the synthesis that can be applied to other materials as well. We have shown that the novel use of molecular precursors in the controlled synthesis of mono- and bi-layer WS2 leads to superior material quality compared to the widely used direct sulfidization of WO3-based precursors. Record high room temperature charge carrier mobility up to 52 cm2/Vs and ultra-sharp photoluminescence linewidth of just 36 meV over submillimeter areas demonstrate that the quality of this material supersedes also that of naturally occurring materials. By exploiting surface diffusion kinetics of W and S species adsorbed onto a substrate, a deterministic layer thickness control has also been achieved promoting the design of scalable synthesis routes. Furthermore, we have also found a way of achieving n-doping on CVD WSe2 monolayers . While WSe2 is known to exhibit ambipolar or p-doping behavior, there is not yet a strategy to achieve n-doping. We have identify a precursor of WSe2 to be used for the CVD synthesis which can also enable n-doping in the material. The result is a very stable chemical doping which can be implemented over large scales which can be used for the fabrication of functional devices such as LEDs, photovoltaic devices and field effect transistors. |
| Exploitation Route | These findings will help establishing new technologies based on 2D materials. In specific, they will impact the development of atomically thin LEDs, photovoltaic devices and filed effect transistors. The engaged collaborations will help expanding the potential of these materials for photodetectors and valleytronics. |
| Sectors | Electronics,Energy,Healthcare,Manufacturing, including Industrial Biotechology |
| Description | The findings have been used to establish new fundamental knowledge in the field of semiconducting 2D materials, beyond graphene. The field of 2D materials can extensively benefit the society, contributing to revolutionizing health care diagnostic wearable systems, energy harvesting devices and telecommunication technologies. The materials synthesized within the scope of this project have attracted interest of industries (BASF, Toshiba) and organizations (Naval Research Laboratories (USA), National Physics Laboratories (UK)) that are now interested in following our synthesis and devices developments to establish collaborations through new grant applications. Further, new academic collaborations have emerged to exploit the optical properties and the strong spin -orbit effect of the synthesized materials, and new grants are following. We recently established a new collaborative work with Thales Research and Technology to develop spin transport in WS2-based 2D-magnetic tunnel junctions (2D-MTJs) and with the Laboratoire de Physique des Solides, at the University Paris-Saclay, we have studied the low-temperature magnetotransport measurements of graphene proximitized to WS2, demonstrating weak antilocalization peaks, a signature of strong SOI induced in graphene. This has been revealed to be extremely strong with an estimated spin-orbit (SO) scattering strength for graphene/monolayer WS2 to be~10 meV. |
| First Year Of Impact | 2020 |
| Sector | Electronics,Energy,Healthcare,Manufacturing, including Industrial Biotechology |
| Impact Types | Societal,Economic |
| Description | ERC Consolidator Grant |
| Amount | € 1,999,968 (EUR) |
| Organisation | European Commission H2020 |
| Sector | Public |
| Country | Belgium |
| Start | 09/2019 |
| End | 08/2024 |
| Description | Marie Sklodowska-Curie Fellowship (project title:Three-Dimensional Graphene Architectures as Templates for Electrochemical Devices) |
| Amount | £144,781 (GBP) |
| Funding ID | 660721 |
| Organisation | European Commission |
| Sector | Public |
| Country | European Union (EU) |
| Start | 05/2015 |
| End | 05/2017 |
| Description | Research Fellows Enhancement Award 2017 |
| Amount | £100,992 (GBP) |
| Organisation | The Royal Society |
| Sector | Charity/Non Profit |
| Country | United Kingdom |
| Start | 03/2018 |
| End | 12/2021 |
| Description | Responsive mode |
| Amount | £768,786 (GBP) |
| Funding ID | EP/M022250/1 |
| Organisation | Engineering and Physical Sciences Research Council (EPSRC) |
| Sector | Public |
| Country | United Kingdom |
| Start | 07/2015 |
| End | 06/2018 |
| Description | University Research Fellowships Renewals 2017 |
| Amount | £486,789 (GBP) |
| Organisation | The Royal Society |
| Sector | Charity/Non Profit |
| Country | United Kingdom |
| Start | 04/2018 |
| End | 04/2021 |
| Description | Collaboartion with Laboratoire de Physique des Solides, Université Paris Sud |
| Organisation | University Paris Sud |
| Department | Solid State Physics Laboratory |
| Country | France |
| Sector | Academic/University |
| PI Contribution | The goal of the collaborative work is to study quantum transport in 2D systems at low temperature. My research team contributes providing exceptionally high quality materials, monolayer WS2, which can uniquely enable observation of quantum transport phenomena predicted only at this stage. |
| Collaborator Contribution | The partner group is an international renowned expert in quantum transport in mesoscopic systems and low temperature molecular electronics. |
| Impact | One research article is under preparation and there are upcoming presentations at international conferences. |
| Start Year | 2016 |
| Description | Los Alamos National Laboratory, Exeter University, Univeristy College London |
| Organisation | Los Alamos National Laboratory |
| Country | United States |
| Sector | Public |
| PI Contribution | Synthesis of high quality WS2 and proposal of the design of devices to be fabricates for light emission/harvesting uses (Los Alamos National Laboratory). Synthesis of high quality WS2 and joint discussions of what electronic devices to fabricate (Exeter University). Synthesis of high quality WS2 and proving materials to UCL team for advanced characterizations (University College London). |
| Collaborator Contribution | Synthesis of high quality WS2 and proposal of the design of devices to be fabricates for light emission/harvesting uses (Los Alamos National Laboratory) to be realize by a research assistant of my team spending a secondment at LANL in 2015. Synthesis of high quality WS2 and joint discussions of what electronic devices to fabricate (Exeter University). Synthesis of high quality WS2 and proving materials to UCL team for advanced characterizations (University College London). |
| Impact | All the named collaboration just started. |
| Start Year | 2014 |
| Description | Los Alamos National Laboratory, Exeter University, Univeristy College London |
| Organisation | University College London |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | Synthesis of high quality WS2 and proposal of the design of devices to be fabricates for light emission/harvesting uses (Los Alamos National Laboratory). Synthesis of high quality WS2 and joint discussions of what electronic devices to fabricate (Exeter University). Synthesis of high quality WS2 and proving materials to UCL team for advanced characterizations (University College London). |
| Collaborator Contribution | Synthesis of high quality WS2 and proposal of the design of devices to be fabricates for light emission/harvesting uses (Los Alamos National Laboratory) to be realize by a research assistant of my team spending a secondment at LANL in 2015. Synthesis of high quality WS2 and joint discussions of what electronic devices to fabricate (Exeter University). Synthesis of high quality WS2 and proving materials to UCL team for advanced characterizations (University College London). |
| Impact | All the named collaboration just started. |
| Start Year | 2014 |
| Description | Los Alamos National Laboratory, Exeter University, Univeristy College London |
| Organisation | University of Exeter |
| Country | United Kingdom |
| Sector | Academic/University |
| PI Contribution | Synthesis of high quality WS2 and proposal of the design of devices to be fabricates for light emission/harvesting uses (Los Alamos National Laboratory). Synthesis of high quality WS2 and joint discussions of what electronic devices to fabricate (Exeter University). Synthesis of high quality WS2 and proving materials to UCL team for advanced characterizations (University College London). |
| Collaborator Contribution | Synthesis of high quality WS2 and proposal of the design of devices to be fabricates for light emission/harvesting uses (Los Alamos National Laboratory) to be realize by a research assistant of my team spending a secondment at LANL in 2015. Synthesis of high quality WS2 and joint discussions of what electronic devices to fabricate (Exeter University). Synthesis of high quality WS2 and proving materials to UCL team for advanced characterizations (University College London). |
| Impact | All the named collaboration just started. |
| Start Year | 2014 |
| Description | Unite´Mixte de Physique, CNRS, Thales, Univ Paris-Sud, Universite´Paris-Saclay, 91767 Palaiseau, France |
| Organisation | University of Paris-Saclay |
| Country | France |
| Sector | Academic/University |
| PI Contribution | We have provided high quality mono and few-layered WS2 material. |
| Collaborator Contribution | They have performed spin transport in WS2-based 2D-magnetic tunnel junctions (2D-MTJs), unveiling a bandstructure spinfiltering effect specific to the transition metaldichalcogenides (TMDCs) family. |
| Impact | The output are research articles published in peer-reviewed journals. |
| Start Year | 2019 |
| Description | Conferences, Graphene 2014, Tolouse France 2014 |
| Form Of Engagement Activity | A talk or presentation |
| Part Of Official Scheme? | No |
| Type Of Presentation | paper presentation |
| Geographic Reach | International |
| Primary Audience | Professional Practitioners |
| Results and Impact | The talks has sparked several questions, afterwards discussion over lunch. Visit to reciprocal laboratories and proposal for exchanging samples and starting collaborations. |
| Year(s) Of Engagement Activity | 2014 |
| URL | http://www.mrs.org/spring2014/ |