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(M/W) Thesis on the tailoring the electrical properties of transition metal dichalcogenides monolayer by molecule grafting

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Date Limite Candidature : jeudi 21 mars 2024

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Informations générales

Intitulé de l'offre : (M/W) Thesis on the tailoring the electrical properties of transition metal dichalcogenides monolayer by molecule grafting (H/F)
Référence : UMR8520-STELEN-011
Nombre de Postes : 1
Lieu de travail : VILLENEUVE D ASCQ
Date de publication : vendredi 22 décembre 2023
Type de contrat : CDD Doctorant/Contrat doctoral
Durée du contrat : 36 mois
Date de début de la thèse : 1 février 2024
Quotité de travail : Temps complet
Rémunération : 2 135,00 € gross monthly
Section(s) CN : Condensed matter: electronic properties and structures

Description du sujet de thèse

Progress in research and development of novel 2D materials such as transition metal dichalcogenides (TMD) of the type MX2 (M = Mo, W, Pt; X=S, Se, Te) opens a new way for the fabrication of low-dimensional nanometer structures with unique electronic, optical, and mechanical properties. In order to tune the electronic properties, the doping of the TMD monolayer by the covalent grafting of thiol molecules offers additional possibilities for these systems.

Contexte de travail

In the framework of the ANR project COMODES, our main goal is to investigate the modification of the TMD (WSe2, MoS2, MoSe2 and PtSe2) monolayer properties with different molecules grafted on the monolayer. The molecules considered here are thiol molecules forming a covalent bond with the monolayer. Different thiol molecules (alkyl, phenyl…), with different lengths, and different terminal groups (-H, -CH3, -F or –CF3) will be investigated in the project. Characterizations will be done at the nanoscale by using scanning probe microscopes (in air or in ultra-high vacuum and at low temperature). The TMD monolayer properties study will be (i) the density and homogeneity of molecules grafted with the help of AFM; STM; (ii) the work function by KPFM; (iii) conductivity by C-AFM, and (iv) current-voltage characteristics (I=f(V)) by STM.
The final goal will be to (i) study the impact of the molecular structure on the TMD monolayer properties, and (ii) identify the best couple TMD/molecule for field emission, in collaboration with the partners of the project COMODES.
This project paves the way for the demonstration of a new field emission tip source terminated by functional monolayers.

Le poste se situe dans un secteur relevant de la protection du potentiel scientifique et technique (PPST), et nécessite donc, conformément à la réglementation, que votre arrivée soit autorisée par l'autorité compétente du MESR.

Contraintes et risques

Work in a clean room and work with chemicals and cryogenic liquids.
Travel to partners' sites is to be expected.