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Sujet de stage / Master 2 Internship

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Synthesis and study of the optoelectronic properties of two-dimensional semiconductor nanomaterials

Contact: DERYCKE Vincent, , vincent.derycke@cea.fr, +33 1 69 08 55 65
The student's mission will be to synthesize, characterize and then integrate in optoelectronic devices, two-dimensional semiconductor materials (thickness <1 nm). These materials will be monolayers of MoS2, WS2 and/or SnS2 synthesized by CVD (chemical vapor deposition) and characterized by different techniques (AFM, SEM, XPS, Raman, etc.). The devices will mainly be phototransistors based on combinations of 2D materials.
Possibility of continuation in PhD: Oui
Deadline for application:31/03/2022

Full description:
This internship in materials sciences and nanoelectronics is part of a larger collaborative project aimed at studying the performances of photo-detectors based on two-dimensional semiconductor nanomaterials of the transition metal dichalcogenide type (typically monolayers of MoS2, WS2, SnS2…) and assemblies of these nanomaterials in the form of controlled stacks called van des Waals heterostructures. In this context, the student recruited at CEA Paris-Saclay/NIMBE/LICSEN will have the specific missions of synthesizing by CVD (chemical vapor deposition) 2D semiconductors (monolayers of MoS2, WS2 and/or SnS2 with thickness <1 nm) and characterizing their structural properties by different techniques (AFM, SEM, XPS, Raman, etc.). The laboratory already has a solid experience in the synthesis of MoS2, which will allow a rapid start of the experimental part. To improve the quality of the syntheses already available at LICSEN and to extend the skills of the laboratory to other 2D materials, the student should be strongly involved in understanding the role of different growth parameters. He/she will also use micro/nano-fabrication techniques (electronic and optical lithography…) for the production of field-effect phototransistors, the electrical and optoelectronic properties of which he will measure.

Skills at master's level in the field of nanosciences are essential as well as of course a very high level of motivation and rigor. A level of English allowing the reading of scientific articles is required.
Technics/methods used during the internship:
CVD, SEM, AFM, XPS, Raman, ebeam and optical lithography, metal deposition, electrical and optoelectrical measurements

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