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Investigation of III–V Nanowires by Plan-View Transmission Electron Microscopy: InN Case Study

  • Esperanza Luna (a1), Javier Grandal (a1) (a2), Eva Gallardo (a1) (a3), José M. Calleja (a3), Miguel Á. Sánchez-García (a2), Enrique Calleja (a2) and Achim Trampert (a1)...

Abstract

We discuss observations of InN nanowires (NWs) by plan-view high-resolution transmission electron microscopy (TEM). The main difficulties arise from suitable methods available for plan-view specimen preparation. We explore different approaches and find that the best results are obtained using a refined preparation method based on the conventional procedure for plan-view TEM of thin films, specifically modified for the NW morphology. The fundamental aspects of such a preparation are the initial mechanical stabilization of the NWs and the minimization of the ion-milling process after dimpling the samples until perforation. The combined analysis by plan-view and cross-sectional TEM of the NWs allows determination of the degree of strain relaxation and reveals the formation of an unintentional shell layer (2–3-nm thick) around the InN NWs. The shell layer is composed of bcc In2O3 nanocrystals with a preferred orientation with respect to the wurtzite InN: In2O3 [111] || InN [0001] and In2O3 <110> || InN< $$ 11\bar 20 $$ >.

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*Corresponding author.luna@pdi-berlin.de

References

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Investigation of III–V Nanowires by Plan-View Transmission Electron Microscopy: InN Case Study

  • Esperanza Luna (a1), Javier Grandal (a1) (a2), Eva Gallardo (a1) (a3), José M. Calleja (a3), Miguel Á. Sánchez-García (a2), Enrique Calleja (a2) and Achim Trampert (a1)...

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