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Univ. Paris-Saclay

Sujet de stage / Master 2 Internship

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Optical functionalization of graphene by self-assembly of organic molecules

Contact: CHARRA Fabrice, , fabrice.charra@cea.fr, +33 1 69 08 97 22/19 76
Summary:
The objective of the master project is to explore the possibilities offered by the self-assembly of organic molecules for the realization of 2D-material heterostructures based on graphene, with a view to applications in photonics.
Possibility of continuation in PhD: Oui
Deadline for application:12/04/2021

Full description:
2D materials such as graphene exhibit original properties. The stacks of different 2D atomically-thin layers, called van-der-Waals heterostructures, are attracting particular attention for innovative applications in electronics and photonics. Unfortunately the number of 2D materials that can be processible in such 2D heterostructures is currently very limited and does not allow to go beyond proofs of principle simple demonstrators. The internship will take place in the framework of a collaborative research project between teams of physicists (CEA Saclay, Institut Néel Grenoble) and chemists (2D-FUEL international laboratory, CNRS and Yonsei University, Seoul, Korea) aiming to introduce Various 2D materials with adjustable properties consisting of a graphene sheet on which an organized network of organic molecules is adsorbed. We will be particularly interested in the photonic properties of van-der-Waals heterostructures based on these systems. The internship will be based on the first results published recently by the project partners: N. Kalashnyk et al., Functional hybrid multilayered van derWaals heterostructures from graphene and self-assembled supramolecular 2D crystals. 2d Materials 6, (2019) https://doi.org/10.1088/2053-1583/ab2ba7 ; N. Kalashnyk et al., Electronic effects of the Bernal stacking of graphite on self-assembled aromatic adsorbates. Chemical Communications 54, 9607-9610 (2018) https://doi.org/10.1039/C8CC05806G ; A. St John et al., Computer modeling of 2D supramolecular nanoporous monolayers self-assembled on graphite. Nanoscale 11, 21284-21290 (2019) https://doi.org/10.1039/C9NR05710B ).
The student contribution will consist in the realization of the structures (transfer of graphene sheets, functionalization by self-assembly in solution or by vacuum deposition), in the structural characterization (local probes techniques such as STM, AFM) and determination of optical properties by microspectroscopy (absorption, luminescence, Raman scattering).
The host team is the Nanophotonics group of SPEC / LEPO http://iramis.cea.fr/spec/LEPO/ . For the purposes of its research, the group has developed significant know-how in the coupling of optical measurements with local probe microscopies. The team research is based on several experimental benches of this type, operating in air or under ultra-high vacuum. The student will also participate in discussions with the project partners to develop techniques for producing heterostructures and participate in the design of organic molecules.
Technics/methods used during the internship:
Processing of 2D materials (humid transfer techniques), solution molecular self-assembly, vacuum deposition, scanning probes (STM, AFM), microspectroscopy (absorption, luminescence, Raman scattering).

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