Specific Process Knowledge/Thin film deposition/Deposition of Zinc: Difference between revisions
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[[Category: Equipment|Thin film]] | [[Category: Equipment|Thin film]] | ||
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===XPS of Al films to detect Zn=== | ===XPS of Al films to detect Zn=== | ||
''Measurements made in June/July 2018.'' | ''Measurements made by Rebecca Ettlinger in June/July 2018.'' | ||
XPS was done at Nanolab with the XPS K-alpha using 50 eV and 50 ms dwell per scan. The number of scans per element varied as shown below in the figure captions. We can clearly see that the Zn amount in the Al film decreased and became indetectable after cleaning the chamber. Of course we cannot guarantee that there is no Zn contamination at all, since there is a detection limit for the XPS even with many scans per level. | XPS was done at Nanolab with the XPS K-alpha using 50 eV and 50 ms dwell per scan. The number of scans per element varied as shown below in the figure captions. We can clearly see that the Zn amount in the Al film decreased and became indetectable after cleaning the chamber. Of course we cannot guarantee that there is no Zn contamination at all, since there is a detection limit for the XPS even with many scans per level. | ||
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===Lessons for future thermal deposition of Zn=== | ===Lessons for future thermal deposition of Zn (by Rebecca Ettlinger) === | ||
*It is better to use a crucible rather than a W boat to heat small Zn pellets, as the pellets sometimes jumped out of the boat when they got hot. | *It is better to use a crucible rather than a W boat to heat small Zn pellets, as the pellets sometimes jumped out of the boat when they got hot. | ||
*Do the deposition in manual mode as the power level for evaporation was not consistent and the rate was not constant even at a constant power level. | *Do the deposition in manual mode as the power level for evaporation was not consistent and the rate was not constant even at a constant power level. | ||