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Experimental and numerical study of ion irradiation impacts on Transition Metal Dichalcogenide layers

Abstract : In this thesis, I present the study of artificially generated defects by ion irradiation on the surface of Transition Metal Dichalcogenides (TMDC), more specifically of tungsten disulphide (WS2) and tungsten diselenide (WSe2) crystals. I also present the structural analysis of WS2 films grown by Reactive Magnetron Sputtering (RMS) and compare the observed structural defects to the artifically generated defects on the bulk crystals This thesis is composed of six chapters. In the first chapter, an introduction to the transition metal dichalcogenide structure and properties is discussed, followed by a discussion of previous studies about the defect generation by ion irradiation. Recent developments in the fabrication methods of TMDC thin-films such as reactive magnetron sputtering are also discussed. In chapter 2 I describe in detail the experimental techniques and the analysis methods used to characterize the TMDC materials and in chapter 3 I describe the methods used for numerical simulation of ion irradiation of TMDCs. In chapter 4, I present my work on the design of the experiments and the calibration of a ion source which was later used to produce low energy ions to artificially generate defects on TMDCs surfaces. Chapter 5 I present my characterization results of WS2 films grown by RMS, which were grown in Uppsala by the team of Tomas Nyberg. In chapter 6 I present the artificial generation of defects on TMDC surfaces using the ion source described in chapter 4. Furthermore, I present the molecular dynamics studies which were performed to have an understanding of the defect production mechanism in TMDCs by ion irradiation.
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Submitted on : Tuesday, June 21, 2022 - 12:58:15 PM
Last modification on : Friday, June 24, 2022 - 11:34:19 AM


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  • HAL Id : tel-03700676, version 2


Pedro Lourenço. Experimental and numerical study of ion irradiation impacts on Transition Metal Dichalcogenide layers. Materials Science [cond-mat.mtrl-sci]. Sorbonne Université, 2022. English. ⟨NNT : 2022SORUS078⟩. ⟨tel-03700676v2⟩



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