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Reference : UMR8214-VERCHA-001
Workplace : ORSAY
Date of publication : Thursday, December 24, 2020
Scientific Responsible name : Andrew MAYNE and Hamid OUGHADDOU
Type of Contract : PhD Student contract / Thesis offer
Contract Period : 36 months
Start date of the thesis : 1 March 2021
Proportion of work : Full time
Remuneration : 2 135,00 € gross monthly
Description of the thesis topic
Hybrid systems composed of organic molecules adsorbed on a semiconductor surface have opened the way to the development of active molecular nano-machines the size of a single molecule. In fact, with the progress made in synthetic chemistry, it is now possible to construct complex organic molecules that can function as memory components, nano-sized photon sources, or mechanical switches. The Scanning Tunnelling Microscope (STM), with a spatial resolution below 0.1 nm, is the ideal tool to probe the electronic and optical properties of single molecules. During the PhD, the student will undertake microscopy experiments on single Graphene Quantum Dots (GQD). These objects are poly-aromatic organic molecules containing at least 96 carbon atoms. The student will explore and characterize, with the STM, how these molecules adsorb on metallic and semi-conductor surfaces under ultra-high vacuum using different techniques available at the ISMO. At the fundamental level, the objective is understand its electronic properties in particular of the surface states, and band structure at the atomic scale. The atomic structure will be probed with Scanning Tunneling Microscopy (STS) and Atomic Force Microscopy (AFM), while the electronic structure will be measured with Scanning Tunneling Spectroscopy (STS) and Photoemission Electron Spectroscopy (PES) using synchrotron Radiation. The STM tip acts as an atomic-scale source of electrons to induce an electronic excitation of the molecule. In collaboration with the LUMIN group from ENS Paris-Saclay, experiments will study the luminescence and the emission of single photons from these activated molecules. Further experiments on the TEMPO beam line at the synchrotron SOLEIL will enable us to determine the electronic properties and chemical behaviour of these molecules. In collaboration with the SPEC group at the CEA, DFT calculations will be carried out.
Three-year PhD Scholarship financed by the BOGART project of the labex Nanosaclay (ANR-10-LABX-0035)
The candidate will carry out the experimental work at ISMO and several runs will be made on the TEMPO beamline at the synchrotron SOLEIL.
Constraints and risks
Experimental work on UHV systems with high voltages, lasers and chemicals (powders and solvents).
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