Material Density Electron Distribution in SEY Layer Band Gap - PowerPoint PPT Presentation

Mar 17, 2024 •219 likes •259 views

Secondary electron yield (SEY) is a function of: Material Density Electron Distribution in SEY Layer Band Gap Primary Electron Energy Some of the best materials for high SEY are electrical insulators/semiconductors:

Secondary electron yield (SEY) is a function of: • Material Density • Electron Distribution in SEY Layer • Band Gap Primary Electron Energy • Some of the best materials for high SEY are electrical insulators/semiconductors: • Film thickness • Positive charging hinders secondary electron emission S econdary E lectron <20eV P rimary E lectron P ath P rimary E lectron ~500eV S econdary E lectrons S E Y Layer C onductive S ubstrate
5 MgO 20Å 30Å 4 40Å Electron Gain (secondaries/primary) 3 Al 2 O 3 2 20Å 30Å 1 40Å 0 0 200 400 600 800 Primary Electron Energy (eV) 2
7 6 Electron Gain (secondaries/primary) 5 Max. Gain vs. Thickness MgO Al 2 O 3 4 3 2 0 25 50 75 100 125 150 175 200 225 Sample Thickness (Å) 3

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