Strain Measurements in SiGe Devices by Aberration-Corrected High Resolution Electron Microscopy
We measure elastic strains in Si grown on Si1−x Gexsubstrates by aberration-corrected high-resolution transmission electron microscopy (HRTEM). Images are analysed using geometric phase analysis (GPA). We carry out finite element modeling (FEM) of these systems coupled with full atomistic multislice simulations of the deformed structures. Comparison of the results from experiment and simulation reveals the high accuracy and reliability which can be obtained. Strain mapping with HRTEM benefits from the high signal-to-noise ratio of aberration-corrected images. In addition, images can be obtained for thicker crystals which limits thin film relaxation effects and facilitates specimen preparation.
KeywordsSpecimen Thickness Image Simulation Finite Element Method Simulation Finite Element Method Modelling Virtual Substrate
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- 8.GPA Phase, a plug-in for DigitalMicrograph (Gatan), available from HREMResearch Inc.: http://www.hremresearch.com.
- 9.JEMS: P. Stadelmann, http://cimewww.epfl.ch/people/Stadelmann/jemsWebSite/jems.html