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Development of Bragg coherent X-ray diffraction and ptychography methods : application to the study of semiconductor nanostructures

Abstract : Nanotechnologies rely on the introduction of strain engineering to enhance semiconductor devices performances. As a consequence, non-invasive characterization methods with high spatial resolution and strain sensitivity on low-amount-of-matter samples are required. This PhD work focuses on methodology of X-ray diffraction techniques performed in the Bragg geometry, which allows probing the structural properties of crystalline samples. Firstly, the Scanning X-ray Diffraction Microscopy technique, developed on a fast-timescale at the ESRF ID01 undulator beamline, is described through a thorough analysis of an experiment performed on ultra-thin strained SiGe-on-insulator patterns. Secondly, this manuscript focuses on two coherent diffraction imaging techniques, namely Bragg CDI, which yields complex density and strain map of nano-meso crystalline objects, and Ptychography, which use translational diversity to produce quantitative maps of complex transmission function of non-crystalline objects. The motivation developed in this PhD work is to combine these two techniques that both promote highly sensitive phase-contrast properties, in order to provide ultra-high resolution on complex/extended samples. Bragg Ptychography is thus introduced, along with algorithmic descriptions and considerations on the X-ray beam characterization, the latter being still a key component for successful reconstructions.
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Submitted on : Tuesday, September 29, 2020 - 10:59:15 AM
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Gaétan Girard. Development of Bragg coherent X-ray diffraction and ptychography methods : application to the study of semiconductor nanostructures. Materials Science [cond-mat.mtrl-sci]. Université Grenoble Alpes [2020-..], 2020. English. ⟨NNT : 2020GRALY010⟩. ⟨tel-02952077⟩

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