Community Research and Development Information Service - CORDIS

Periodic Report Summary 1 - SPINVALLEY (Epitaxial transition-metal dichalcogenide monolayers for spin-valleytronics)

A summary of progress towards objectives and details for each task;
The outgoing phase was aimed at achieving two main objectives, i.e. WP1 – VdWE and in-situ characterization of TMD monolayers, and WP2 – Surface modification of TMD monolayers resulting from WP1.
For WP1, the fellow (Johnny Wong) has successfully designed and commissioned a compact UHV deposition chamber for the TMD growth. And using such new facility, a number of important and interesting low-dimensional TMD materials have been grown and characterized as planned. Accordingly, the milestone 1 on “VdWE as a viable approach for high-quality growth of TMD monolayer growth” has been reached.
For WP2, the fellow has investigated the possibility of modifying the TMD surfaces achieved in WP1 by introducing foreign molecules. At the end of the outgoing phase, the fellow has managed to study the oxygen and water molecules on vanadium-based TMDs. While, due to the time constraint, studies that involve organic molecules have been planned as a collaborative work and will be mainly performed by the research students in the outgoing host group.
A summary of the progress of the researcher training activities/transfer of knowledge activities/integration activities;
The fellow has received the planned research training from the outgoing host group. The fellow has also attended seminars organized by the host group as well as by the Graphene Research Centre (now Centre for Advanced 2D Materials) in NUS in a regular basis for knowledge transfer. Besides these, the fellow has taken part in mentoring several research students, including two exchange students from the Fontys University of Applied Sciences in the Netherlands, and from the Indian Institute of Science Education and Research at Pune, respectively. The fellow is currently supervising a PhD student, Mr. Zhang Lei, in the outgoing host group, who will carry out the experimental study on the abovementioned organic molecule-TMD interfaces.
Highlight clearly significant results;
The fellow has obtained the following significant results within the scope of the outgoing phase, that are expected to lead to two high-impact peer-reviewed publications:
- In-situ growth and characterization of vanadium-based TMD monolayers (i.e. VSe2 and VTe2) on graphite and graphene/SiC(0001) by molecular-beam epitaxy for the first time.
- Successfully developed capping/decapping processes of the vanadium-based TMDs using an amorphous Se cap for ex-situ sample transfer.
- Surface modification of the vanadium-based TMDs by oxygen and water molecules, and in-situ characterization of the corresponding electronic structures by core-level electron spectroscopy and surface-based microscopy.
If applicable, explain the reasons for failing to achieve critical objectives and/or not being on schedule and explain the impact on other tasks as well as on available resources and planning;
The main issue that has delayed the progress of the outgoing phase was the renovation of the outgoing host lab, during which the main instruments needed for this project were not available for use. Such an unexpected issue mainly affected the progress of Task 2.2 “Surface transfer doping of TMD monolayers by organic molecules” in WP2.
In order to minimize the impact of the above, the fellow relocated the TMD growth chamber to the Singapore Synchrotron Light Source on the campus of NUS, where sample growth and characterization by other relevant measurement techniques were performed. We feel that our results achieved so far have laid a very good foundation for task 2.2 that will soon be carried out by the fellow and the responsible PhD student in the outgoing host group.

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Life Sciences
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