Sequential plan-view imaging of sub-surface structures in the transmission electron microscope

F.C-P. Massabuau, H.P. Springbett, G. Divitini, P.H. Griffin, T. Zhu, R.A. Oliver

Research output: Contribution to journalArticle

Abstract

Transmission electron microscopy (TEM) is a central technique for the characterisation of materials at the atomic scale. However, it requires the sample to be thin enough to be electron transparent, imposing strict limitations when studying thick structures in plan-view. Here we present a method for sequential plan-view TEM that allows one to image complex structures at various depths. The approach consists of performing an iterative series of front-side ion milling followed by TEM imaging. We show it is possible to image how the sample properties vary with depth up to several microns below the surface, with no degradation of the sample and imaging conditions throughout the experiment. We apply this approach to 3D cavities in mesoporous GaN distributed Bragg reflectors, demonstrating the ability to characterise the morphology of the pores, local crystal features and chemical composition through the multilayer structure. The same workflow can be applied to a variety of complex micron-scale systems which are by nature too thick for standard TEM analysis, and can also be adapted for profiling samples in cross-section.
Original languageEnglish
Article number100798
JournalMaterialia
Volume12
Early online date18 Jun 2020
DOIs
Publication statusPublished - 1 Aug 2020

Keywords

  • transmission electron microscopy (TEM)
  • sample preparation
  • layered structures
  • Gallium Nitride
  • dislocations

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    Data for: "Sequential plan-view imaging of sub-surface structures in the transmission electron microscope"

    Massabuau, F. (Creator), Springbett, H. (Contributor), Divitini, G. (Contributor), Griffin, P. (Contributor), Zhu, T. (Contributor) & Oliver, R. (Contributor), University of Strathclyde, 18 Jun 2020

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    Cite this

    Massabuau, FC-P., Springbett, H. P., Divitini, G., Griffin, P. H., Zhu, T., & Oliver, R. A. (2020). Sequential plan-view imaging of sub-surface structures in the transmission electron microscope. Materialia, 12, [100798]. https://doi.org/10.1016/j.mtla.2020.100798