Abstract
The successful application of functional nanostructures, fabricated via focused electron-beam-induced deposition (FEBID), is known to depend crucially on its chemistry as FEBID tends to strong incorporation of carbon. Hence, it is essential to understand the underlying mechanisms which finally determine the elemental composition after fabrication. In this study we focus on these processes from a fundamental point of view by means of (1) varying electron emission on the deposit surface; and (2) changing replenishment mechanism, both driven by the growing deposit itself. First, we revisit previous results concerning chemical variations in nanopillars (with a quasi-1D footprint) depending on the process parameters. In a second step we expand the investigations to deposits with a 3D footprint which are more relevant in the context of applications. Then, we demonstrate how technical setups and directional gas fluxes influence final chemistries. Finally, we put the findings in a bigger context with respect to functionalities which demonstrates the crucial importance of carefully set up fabrication processes to achieve controllable, predictable and reproducible chemistries for FEBID deposits as a key element for industrially oriented applications.
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Acknowledgments
The authors gratefully acknowledge the valuable support provided by Prof. Dr. Ferdinand Hofer, Prof. Dr. Gerald Kothleitner, Prof. Dr. Werner Grogger, Prof. Dr. Philip D. Rack, Dr. Jason Fowlkes, Dr. Ivo Utke, Dr. Julian Wagner, DI Roland Schmied, Alexander Melischnig, Laura Resch, and Martina Dienstleder. Special gratitude is given to Angus Young, Malcom Young, Phil Rudd, Cliff Williams, and Brian Johnson for constant inspiration. The authors also thank the FFG Austria (base project Nr. 830186), the European Union (EUROSTARS project E! 8213) and the COST funding (Nr. CM 1301) for their financial support.
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Winkler, R., Geier, B. & Plank, H. Spatial chemistry evolution during focused electron beam-induced deposition: origins and workarounds. Appl. Phys. A 117, 1675–1688 (2014). https://doi.org/10.1007/s00339-014-8496-y
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DOI: https://doi.org/10.1007/s00339-014-8496-y