Chalcogenide-based memory and logic for flexible electronics applications (PhD in Physics/Engineering) Ref: 3400

About the award

We are currently awaiting a decision from EPSRC regarding an application for a Centre for Doctoral Training in Functional and Meta- Materials (2019-2027) which will build on our expertise in Doctoral Training gained through the CDT in Metamaterials (XM²) since 2014.  A funding decision is expected by January 2019.
The successful applicant will join the new CDT programme if Exeter succeeds in its bid.

For eligible students the 4 year studentship (value approx. £102,000) will cover UK/EU tuition fees, plus an annual tax-free stipend at the UKRI national minimum doctoral level (£14,777 for 2018) plus £2,250 per year, or pro rata for part-time study, plus a Research and Training Support Grant (RTSG) of £13,000. Tuition fees and RTSG only for international students.

XM² now has over 80 post graduate researchers.  Its aim is to undertake world-leading research, while training scientists and engineers with the relevant research skills and knowledge, and professional attributes for industry and academia.

Please visit www.exeter.ac.uk/metamaterials for more information about the current CDT and an indication of what to expect.

This studentship will be based on the Streatham Campus in Exeter. 

Joint supervisors: Prof C D Wright, Prof M F Craciun

External partners: PragmatIC Ltd (Dr C Ramsdale); University of Southampton (Prof D Hewak)

Statement of Research

Here we will explore the use of ultra-thin and 2D chalcogenide semiconductor materials for the provision of non-volatile, re-writable phase-change memories and logic suited to flexible electronics applications. The project is sponsored by PragmatIC (www.pragmatic.tech), who are developing ultra-low cost flexible integrated circuits (FlexICs) thinner than a human hair that can easily be embedded into everyday objects enabling smart packaging, smart labels and smart objects that interact with consumers and their environments. In preliminary work [1-3] we have already shown that both 2D and low-dimensional chalcogenide alloys are suited to use in flexible systems (in the former the phase-transition is between semimetal and semiconducting phases, in the latter between amorphous and crystalline phases). However, very significant challenges remain in terms of materials development and device design so as to meet the requirements (e.g. high numbers of switching cycles, low-energy switching, fast switching speed, true non-volatility, longevity) for real-world applications. In this project, therefore, we will address such challenges by developing (i) novel phase-change device configurations for integration into flexible electronics formats and (ii) new chalcogenide phase-change compositions, new 2D heterostructures and new low-temperature (physical vapour deposition) approaches to the large-area fabrication of 2D materials. The research for this project will be carried out primarily at Exeter, but with placement opportunities with PragmatIC at both their Cambridge (research) and NETPark Sedgefield (manufacturing) sites. 

[1] Hosseini P, Wright CD, Bhaskaran H An optoelectronic framework enabled by low-dimensional phase-change films, Nature, 511, 206-211, DOI:10.1038/nature13487 (2014)

[2] Alkhalil F, Ramsdale C, Au Y Y, Zeimpekis I, Hewak D and Wright CD, Phase-Change Memory for Flexible Electronics, http://www-large-area-electronics.eng.cam.ac.uk/innoLAE2018, InnoLAE 2018 Conference (2018)

[3] Nagareddy VK, Octon T J, Townsend NJ, Russo S, Craciun MF and Wright CD, Humidity‐Controlled Ultralow Power Layer‐by‐Layer Thinning, Nanopatterning and Bandgap Engineering of MoTe2, Advanced Functional Materials, https://doi.org/10.1002/adfm.201804434 (2018)

About us

Exeter has a well-established and strong track record in functional materials and metamaterials research, spanning a unique mix of interests in our focus areas:

  •     Acoustic, Phononic and Fluidic Metamaterials
  •     Microwave and RF Metamaterials and Devices
  •     Nanocomposites and Manufacturing
  •     Photonic and Plasmonic Materials
  •     Soft Matter, Biomaterials and Sensors
  •     Spintronics, Magnonics and Magnetic Materials
  •     Theory and Modelling to drive Targeted Material and Device Design
  •     Two Dimensional Electronic and Photonic Materials

Exeter is amongst the top 150 universities worldwide according to the Times Higher Education World University Rankings, the most influential global league table.
Functional Materials (from fundamentals to manufacturing) is one of 5 key themes supported by the UoE as part of its £320 million Science Strategy investing in staff and facilities. This theme has benefitted from the appointment of 23 new academics (including 7 full professors) along with £20m of investment in research infrastructure (including 3 new electronics/photonics clean-rooms, a graphene engineering laboratory, a nano-functional materials fabrication suite, a materials characterisation suite).

This is in parallel to significant external capital investment in our research including over £2m of equipment funding from the EPSRC/HEFCE SIA award (Exeter-Bath Centre for Graphene Science), the £2.6m ERDF-EADS funded Exeter Centre for Additive Layer Manufacture (CALM); £1.1, for Exeter’s EPSRC Time-Resolved Magnetism Facility; £1.2m for equipment funding from the EPSRC Graphene Engineering Call. Such investments ensure that we have, in-house, all the state-of-the-art materials, fabrication and characterisation facilities required by our PGRs.

Our research and PhD training experience, expertise, facilities and network makes the University of Exeter one of the very best places to pursue postgraduate and early career research.

How to apply

Application criteria

During the application process you will need to upload the documents listed below. Please prepare these before starting the application process.

  • An academic CV;
  • Degree transcript(s) giving information about the qualification awarded, the modules taken during the study period, and the marks for each module taken.
  • A cover letter outlining your research interests in general, the title of the project you are applying;
  • A Personal Statement consisting of two parts (written statement or link to other media)*:
  1. Describe a) why you would like to study for a PhD, b) why you would like to focus on this particular topic, c) any relevant expertise and d) your future career ambitions;

  2. Describe the qualities that you believe will make you a great researcher (in particular as part of a team).

You will be asked to provide the contact details of two academic referees.


* We foster creativity and utilisation of individual strengths. Applicants are encouraged to provide evidence to support their statements. This might include conventional written documents (e.g. examples of work), but we also encourage alternatives such as audio or video recordings, websites, programming etc. Please ensure to include accessible links to such files in an appropriately named document as part of the upload process.

Application procedure

Shortlisting and interviews

Applications will be reviewed by at least two academic members of staff.
Candidates will be short-listed against a set of agreed criteria to ensure quality while maintaining diversity. Failure to include all the elements listed above may result in rejection.
The essential assessment criteria:

  •     Undergraduate degree in a relevant discipline (minimum 2:1);
  •     Vision and motivation (for research & professional development);
  •     Evidence of the ability to work collaboratively and to engage in a diverse community;
  •     Evidence of excellent written and oral skills in English.

The highest quality candidates will also be able to demonstrate one of more of the following:

  •     Specialist knowledge about one or more of the 8 research areas listed above;
  •     Training in research methodology (e.g. undergraduate research projects);
  •     Research outputs (e.g. papers) and/or other indicators of academic excellence (e.g. awards).

Shortlisted candidates will be invited to an entry interview to assess whether they are suited to the CDT concept. The panel will normally consist of 3 people, including members of the CDT's Strategic Leadership Team and a current postgraduate researchers or post-doc in Physics or Engineering. If the applicant is successful, a second interview will take place to assess academic skills and fit to the project by the project supervisors.

Interviews are expected to start in the second half of January 2019.

Please email metamaterials@exeter.ac.uk if you have any queries about this process.

Summary

Application deadline:30th April 2019
Number of awards:1
Value:Approx. £102,000 for 48 months (pro-rata for part-time study): covers UK/EU tuition fees, annual tax-free stipend at UKRI minimum doctoral level (£14,777 for 2018) plus £2,250 per year, plus £13,000 RTSG. International students: fees & RTSG only.
Duration of award:per year
Contact: Prof. Alastair Hibbins (Admissions Tutor) metamaterials@exeter.ac.uk