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Exciton dynamics in diamond and two-dimensional metal dichalcogenide enabled van der Waals heterostructures


   Cardiff School of Physics and Astronomy

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  Prof Oliver Williams, Dr BH Hou  Applications accepted all year round  Self-Funded PhD Students Only

About the Project

Two-dimensional (2D) materials offer a platform that allows the creation of heterostructures with a variety of properties. One- atom-thick crystals now comprise a large family of these materials, collectively covering a comprehensive range of features and numerous intrigue scientific challenges. For instance, the property of CVD synthesised atomically thin 2D materials have strong substrate dependence associated with their epitaxial lattice growth.

Moreover, atomically thin 2D materials can be assembled in vertical stacks that are held together by relatively weak van der Waals forces, enabling coupling between monolayer crystals with incommensurate lattices and arbitrary mutual rotation. In this project, we will fabricate new-type of heterostructures based on incommensurate molybdenum diselenide/disulfide (MoSe2 or MoS2) or tungsten disulfide/diselenide (WS2 or WSe2) monolayers with Diamond, and we will investigate a series intrigue excitonic bands hybridisation, exciton dynamics under radiation, and optoelectronic device studies (phototransistor, photodetectors and LEDs). These findings underpin strategies for band-structure engineering in semiconductor devices based on van der Waals heterostructures grown on Diamond.

Interested applicants can find out more about our PhD programme and apply via the following link: Physics and Astronomy - Study - Cardiff University

Please submit the following documents with your application:

  • All of your University level certificates and transcripts to date
  • Two references (at least one of these must be academic)
  • Your academic CV
  • Your personal statement

Funding Notes

Please note that bench fees may be charged in addition to tuition fees for this project. This will be confirmed as part of any formal offer for this project.

References

1. ACS Appl. Mater. Interfaces 11, 43, 40826-40834 (2019)
2. Sci Rep 9, 2911 (2019)
3. Nanoscale, 11, 10266-10272 (2019)
4. ACS Nano, 13, 11, 13047-13055 (2019)
5. Nature 567, 81–86 (2019)

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